The Experts below are selected from a list of 144 Experts worldwide ranked by ideXlab platform
Wenyou Hu - One of the best experts on this subject based on the ideXlab platform.
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In situ investigation of heavy metals at trace concentrations in Greenhouse Soils via portable X-ray fluorescence spectroscopy.
Environmental Science and Pollution Research, 2018Co-Authors: Kang Tian, Zhe Xing, Biao Huang, Wenyou HuAbstract:Soil pollution by heavy metals (HMs) has rapidly become a major threat to vegetable security. Nearly all cultivated Soils are at risk of metal accumulation, and Greenhouse Soils are among the most heavily impacted Soils. In this study, a rapid assessment of HMs at trace concentrations was conducted via portable X-ray fluorescence (PXRF) spectroscopy in Shouguang, China. Measurements were made via PXRF under in situ, ex situ and sieved conditions and by inductively coupled plasma mass spectrometry (ICP-MS) after acid digestion. The performance of each PXRF measure relative to the ICP-MS method was assessed by linear regression. Redundancy analysis was performed to quantify the proportion of explained variability between the PXRF and ICP-MS data. Evaluation of the possible sources of HMs and their potential risks was then conducted by multivariate analysis. The results showed that the PXRF data were closely correlated with ICP-MS quantification for Cu, Mn and Zn, whereas no significant correlations were found for As, Ni and Pb. The uncertainties of PXRF measurement derived from soil heterogeneity accounted for 20.02% of total variability and those from moisture and particle size accounted for 20.15%. The geo-accumulation index (Igeo) indicated that the Greenhouse Soils were potentially contaminated by Cu and Zn (Igeo > 0), which can be attributed to anthropogenic activities. Overall, PXRF spectroscopy is promising as a rapid and nondestructive in situ technique for assessing the potential risks of HMs at trace concentrations in Greenhouse Soils.
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accumulation sources and health risks of trace metals in elevated geochemical background Soils used for Greenhouse vegetable production in southwestern china
Ecotoxicology and Environmental Safety, 2017Co-Authors: Haidong Zhang, Wenyou Hu, Mohammad Saleem Akhtar, Linlin Dong, Biao Huang, Mingkai QuAbstract:Abstract Greenhouse vegetable cultivation with substantive manure and fertilizer input on Soils with an elevated geochemical background can accumulate trace metals in Soils and plants leading to human health risks. Studies on trace metal accumulation over a land use shift duration in an elevated geochemical background scenario are lacking. Accumulation characteristics of seven trace metals in Greenhouse soil and edible plants were evaluated along with an assessment of the health risk to the consumers. A total of 118 Greenhouse surface Soils (0–20 cm) and 30 vegetables were collected from Kunming City, Yunnan Province, southwestern China, and analyzed for total Cd, Pb, Cu, Zn, As, Hg, and Cr content by ICP-MS and AFS. The trace metals were ordered Cu>Cd>Hg>Zn>Pb>As>Cr in Greenhouse Soils accumulation level, and the geo-accumulation index suggested the soil more severely polluted with Cd, Cu, Hg and Zn. The Greenhouse and open-field Soils had significant difference in Cd, Cr and Zn. The duration of shift from paddy to Greenhouse land-use significantly influenced trace metal accumulation with a dramatic change during five to ten year Greenhouse land-use, and continuous increase of Cd and Hg. A spatial pattern from north to south for Cd and Hg and a zonal pattern for Cu and Zn were found. An anthropogenic source primarily caused trace metal accumulation, where the principal component analysis/multiple linear regression indicated a contribution 61.2%. While the assessment showed no potential risk for children and adults, the hazard health risks index was greater than one for adolescents. The extended duration of land use as Greenhouses caused the trace metal accumulation, rotation in land use should be promoted to reduce the health risks.
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heavy metals in intensive Greenhouse vegetable production systems along yellow sea of china levels transfer and health risk
Chemosphere, 2017Co-Authors: Wenyou Hu, Kang Tian, Peter E. Holm, Biao Huang, Yanxia ZhangAbstract:Abstract Recently, Greenhouse vegetable production (GVP) has grown rapidly and counts a large proportion of vegetable production in China. In this study, the accumulation, health risk and threshold values of selected heavy metals were evaluated systematically. A total of 120 paired soil and vegetable samples were collected from three typical intensive GVP systems along the Yellow Sea of China. Mean concentrations of Cd, As, Hg, Pb, Cu and Zn in Greenhouse Soils were 0.21, 7.12, 0.05, 19.81, 24.95 and 94.11 mg kg−1, respectively. Compared to rootstalk and fruit vegetables, leafy vegetables had relatively high concentrations and transfer factors of heavy metals. The accumulation of heavy metals in Soils was affected by soil pH and soil organic matter. The calculated hazard quotients (HQ) of the heavy metals by vegetable consumption decreased in the order of leafy > rootstalk > fruit vegetables with hazard index (HI) values of 0.61, 0.33 and 0.26, respectively. The HI values were all below 1, which indicates that there is a low risk of Greenhouse vegetable consumption. Soil threshold values (STVs) of heavy metals in GVP system were established according to the health risk assessment. The relatively lower transfer factors of rootstalk and fruit vegetables and higher STVs suggest that these types of vegetables are more suitable for cultivation in Greenhouse Soils. This study will provide an useful reference for controlling heavy metals and developing sustainable GVP.
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Determination and evaluation of heavy metals in Soils under two different Greenhouse vegetable production systems in eastern China.
Chemosphere, 2016Co-Authors: Kang Tian, Wenyou Hu, Zhe Xing, Mengmeng Jia, Biao Huang, Mengxue WanAbstract:Abstract The evaluation of heavy metals (HMs) in Greenhouse Soils is crucial for both environmental monitoring and human health; thus, it is imperative to determine their concentrations, identify their sources and assess their potential risks. In this study, eight metals (As, Cd, Cr, Cu, Hg, Ni, Pb, and Zn) in 167 surface Soils were investigated in two representative Greenhouse vegetable systems of China: perennial solar Greenhouse (SG) and seasonal plastic Greenhouse (PG). The results indicated accumulations of Cd, Cu, Hg and Zn in the SG Soils and Cd, Pb, Hg and Zn in the PG Soils, with higher concentrations than the background values. In particular, Cd and Hg exhibited high levels of pollution under both GVP systems due to their positive Igeo values. Principle component analysis (PCA) and correlation analysis suggested that Cd, Cu, Hg and Zn in the SG Soils and Cd, Hg and Zn in the PG Soils were mainly related to intensive farming practices; Pb in the PG Soils was significantly affected by atmospheric deposition. The results showed that soil characteristics, in particular soil organic matter, total nitrogen and total phosphorus, exerted significant influence on Hg, Cu, Cd, and Zn under the SG system. However, the HMs in the PG Soils were weakly affected by soil properties. Overall, this study provides comparative research on the accumulation, potential risks and sources of HMs in two typical Greenhouse Soils in China, and our findings suggest that, Cd and Hg in both Greenhouse Soils could potentially represent environmental problems.
Biao Huang - One of the best experts on this subject based on the ideXlab platform.
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In situ investigation of heavy metals at trace concentrations in Greenhouse Soils via portable X-ray fluorescence spectroscopy.
Environmental Science and Pollution Research, 2018Co-Authors: Kang Tian, Zhe Xing, Biao Huang, Wenyou HuAbstract:Soil pollution by heavy metals (HMs) has rapidly become a major threat to vegetable security. Nearly all cultivated Soils are at risk of metal accumulation, and Greenhouse Soils are among the most heavily impacted Soils. In this study, a rapid assessment of HMs at trace concentrations was conducted via portable X-ray fluorescence (PXRF) spectroscopy in Shouguang, China. Measurements were made via PXRF under in situ, ex situ and sieved conditions and by inductively coupled plasma mass spectrometry (ICP-MS) after acid digestion. The performance of each PXRF measure relative to the ICP-MS method was assessed by linear regression. Redundancy analysis was performed to quantify the proportion of explained variability between the PXRF and ICP-MS data. Evaluation of the possible sources of HMs and their potential risks was then conducted by multivariate analysis. The results showed that the PXRF data were closely correlated with ICP-MS quantification for Cu, Mn and Zn, whereas no significant correlations were found for As, Ni and Pb. The uncertainties of PXRF measurement derived from soil heterogeneity accounted for 20.02% of total variability and those from moisture and particle size accounted for 20.15%. The geo-accumulation index (Igeo) indicated that the Greenhouse Soils were potentially contaminated by Cu and Zn (Igeo > 0), which can be attributed to anthropogenic activities. Overall, PXRF spectroscopy is promising as a rapid and nondestructive in situ technique for assessing the potential risks of HMs at trace concentrations in Greenhouse Soils.
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accumulation sources and health risks of trace metals in elevated geochemical background Soils used for Greenhouse vegetable production in southwestern china
Ecotoxicology and Environmental Safety, 2017Co-Authors: Haidong Zhang, Wenyou Hu, Mohammad Saleem Akhtar, Linlin Dong, Biao Huang, Mingkai QuAbstract:Abstract Greenhouse vegetable cultivation with substantive manure and fertilizer input on Soils with an elevated geochemical background can accumulate trace metals in Soils and plants leading to human health risks. Studies on trace metal accumulation over a land use shift duration in an elevated geochemical background scenario are lacking. Accumulation characteristics of seven trace metals in Greenhouse soil and edible plants were evaluated along with an assessment of the health risk to the consumers. A total of 118 Greenhouse surface Soils (0–20 cm) and 30 vegetables were collected from Kunming City, Yunnan Province, southwestern China, and analyzed for total Cd, Pb, Cu, Zn, As, Hg, and Cr content by ICP-MS and AFS. The trace metals were ordered Cu>Cd>Hg>Zn>Pb>As>Cr in Greenhouse Soils accumulation level, and the geo-accumulation index suggested the soil more severely polluted with Cd, Cu, Hg and Zn. The Greenhouse and open-field Soils had significant difference in Cd, Cr and Zn. The duration of shift from paddy to Greenhouse land-use significantly influenced trace metal accumulation with a dramatic change during five to ten year Greenhouse land-use, and continuous increase of Cd and Hg. A spatial pattern from north to south for Cd and Hg and a zonal pattern for Cu and Zn were found. An anthropogenic source primarily caused trace metal accumulation, where the principal component analysis/multiple linear regression indicated a contribution 61.2%. While the assessment showed no potential risk for children and adults, the hazard health risks index was greater than one for adolescents. The extended duration of land use as Greenhouses caused the trace metal accumulation, rotation in land use should be promoted to reduce the health risks.
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heavy metals in intensive Greenhouse vegetable production systems along yellow sea of china levels transfer and health risk
Chemosphere, 2017Co-Authors: Wenyou Hu, Kang Tian, Peter E. Holm, Biao Huang, Yanxia ZhangAbstract:Abstract Recently, Greenhouse vegetable production (GVP) has grown rapidly and counts a large proportion of vegetable production in China. In this study, the accumulation, health risk and threshold values of selected heavy metals were evaluated systematically. A total of 120 paired soil and vegetable samples were collected from three typical intensive GVP systems along the Yellow Sea of China. Mean concentrations of Cd, As, Hg, Pb, Cu and Zn in Greenhouse Soils were 0.21, 7.12, 0.05, 19.81, 24.95 and 94.11 mg kg−1, respectively. Compared to rootstalk and fruit vegetables, leafy vegetables had relatively high concentrations and transfer factors of heavy metals. The accumulation of heavy metals in Soils was affected by soil pH and soil organic matter. The calculated hazard quotients (HQ) of the heavy metals by vegetable consumption decreased in the order of leafy > rootstalk > fruit vegetables with hazard index (HI) values of 0.61, 0.33 and 0.26, respectively. The HI values were all below 1, which indicates that there is a low risk of Greenhouse vegetable consumption. Soil threshold values (STVs) of heavy metals in GVP system were established according to the health risk assessment. The relatively lower transfer factors of rootstalk and fruit vegetables and higher STVs suggest that these types of vegetables are more suitable for cultivation in Greenhouse Soils. This study will provide an useful reference for controlling heavy metals and developing sustainable GVP.
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geochemical baseline establishment and ecological risk evaluation of heavy metals in Greenhouse Soils from dongtai china
Ecological Indicators, 2017Co-Authors: Kang Tian, Biao Huang, Zhe XingAbstract:Abstract Currently, heavy metal (HM) contamination in Greenhouse Soils is a significant concern due to the rapid expansion of Greenhouse agriculture. However, it is difficult to accurately assess HM pollution in Greenhouse Soils in China due to the lack of local geochemical baseline concentrations (GBCs) or corresponding background values. In the present study, the GBCs of HMs in Dongtai, a representative Greenhouse area of China, were established from subSoils using cumulative frequency distribution (CFD) curves. The pollution levels of HMs and potential ecological risks were investigated using different quantitative indices, such as geo-accumulation index (I geo ), pollution index (PI), pollution load index (PLI) and ecological risk index (RI), based on these regional GBCs. The total concentrations of six metals (Cd, Cr, Cu, Ni, Pb and Zn) in surface Soils were determined and shown to be lower than the concentrations reported in other Greenhouse regions of China. The GBCs of Cd, Cr, Cu, Ni, Pb and Zn were 0.059–0.092, 39.20–54.50, 12.52–15.57, 20.63–23.26, 13.43–16.62 and 43.02–52.65 mg kg −1 , respectively. Based on this baseline criterion, Cd, Pb and Zn accumulated in the surface Soils because they were present at concentrations higher than their baseline values. The Soils were moderately polluted by Cd according to the I geo values, and the PI results indicated that moderate Cd contamination was present in this area. The large variation of I geo value of Cd revealed that Cd in this area was likely influenced by agricultural activities. The PLI showed that most of the study area was moderately polluted. However, an analysis of the RI showed that the investigated HMs had low ecological risks. Correlation analysis and principle component analysis suggested that the Cd, Pb and Zn in the Greenhouse Soils mainly originated from anthropogenic sources (agricultural activities, atmospheric deposition etc.), while Cr, Cu, and Ni originated from natural sources. The findings of this study illustrated the necessity of GBC establishment at the local scale to facilitate more accurate HM evaluation of Greenhouse Soils. It is advisable to pay more attention to Cd, which could cause environmental problems in the Greenhouse system.
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Determination and evaluation of heavy metals in Soils under two different Greenhouse vegetable production systems in eastern China.
Chemosphere, 2016Co-Authors: Kang Tian, Wenyou Hu, Zhe Xing, Mengmeng Jia, Biao Huang, Mengxue WanAbstract:Abstract The evaluation of heavy metals (HMs) in Greenhouse Soils is crucial for both environmental monitoring and human health; thus, it is imperative to determine their concentrations, identify their sources and assess their potential risks. In this study, eight metals (As, Cd, Cr, Cu, Hg, Ni, Pb, and Zn) in 167 surface Soils were investigated in two representative Greenhouse vegetable systems of China: perennial solar Greenhouse (SG) and seasonal plastic Greenhouse (PG). The results indicated accumulations of Cd, Cu, Hg and Zn in the SG Soils and Cd, Pb, Hg and Zn in the PG Soils, with higher concentrations than the background values. In particular, Cd and Hg exhibited high levels of pollution under both GVP systems due to their positive Igeo values. Principle component analysis (PCA) and correlation analysis suggested that Cd, Cu, Hg and Zn in the SG Soils and Cd, Hg and Zn in the PG Soils were mainly related to intensive farming practices; Pb in the PG Soils was significantly affected by atmospheric deposition. The results showed that soil characteristics, in particular soil organic matter, total nitrogen and total phosphorus, exerted significant influence on Hg, Cu, Cd, and Zn under the SG system. However, the HMs in the PG Soils were weakly affected by soil properties. Overall, this study provides comparative research on the accumulation, potential risks and sources of HMs in two typical Greenhouse Soils in China, and our findings suggest that, Cd and Hg in both Greenhouse Soils could potentially represent environmental problems.
Kang Tian - One of the best experts on this subject based on the ideXlab platform.
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In situ investigation of heavy metals at trace concentrations in Greenhouse Soils via portable X-ray fluorescence spectroscopy.
Environmental Science and Pollution Research, 2018Co-Authors: Kang Tian, Zhe Xing, Biao Huang, Wenyou HuAbstract:Soil pollution by heavy metals (HMs) has rapidly become a major threat to vegetable security. Nearly all cultivated Soils are at risk of metal accumulation, and Greenhouse Soils are among the most heavily impacted Soils. In this study, a rapid assessment of HMs at trace concentrations was conducted via portable X-ray fluorescence (PXRF) spectroscopy in Shouguang, China. Measurements were made via PXRF under in situ, ex situ and sieved conditions and by inductively coupled plasma mass spectrometry (ICP-MS) after acid digestion. The performance of each PXRF measure relative to the ICP-MS method was assessed by linear regression. Redundancy analysis was performed to quantify the proportion of explained variability between the PXRF and ICP-MS data. Evaluation of the possible sources of HMs and their potential risks was then conducted by multivariate analysis. The results showed that the PXRF data were closely correlated with ICP-MS quantification for Cu, Mn and Zn, whereas no significant correlations were found for As, Ni and Pb. The uncertainties of PXRF measurement derived from soil heterogeneity accounted for 20.02% of total variability and those from moisture and particle size accounted for 20.15%. The geo-accumulation index (Igeo) indicated that the Greenhouse Soils were potentially contaminated by Cu and Zn (Igeo > 0), which can be attributed to anthropogenic activities. Overall, PXRF spectroscopy is promising as a rapid and nondestructive in situ technique for assessing the potential risks of HMs at trace concentrations in Greenhouse Soils.
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heavy metals in intensive Greenhouse vegetable production systems along yellow sea of china levels transfer and health risk
Chemosphere, 2017Co-Authors: Wenyou Hu, Kang Tian, Peter E. Holm, Biao Huang, Yanxia ZhangAbstract:Abstract Recently, Greenhouse vegetable production (GVP) has grown rapidly and counts a large proportion of vegetable production in China. In this study, the accumulation, health risk and threshold values of selected heavy metals were evaluated systematically. A total of 120 paired soil and vegetable samples were collected from three typical intensive GVP systems along the Yellow Sea of China. Mean concentrations of Cd, As, Hg, Pb, Cu and Zn in Greenhouse Soils were 0.21, 7.12, 0.05, 19.81, 24.95 and 94.11 mg kg−1, respectively. Compared to rootstalk and fruit vegetables, leafy vegetables had relatively high concentrations and transfer factors of heavy metals. The accumulation of heavy metals in Soils was affected by soil pH and soil organic matter. The calculated hazard quotients (HQ) of the heavy metals by vegetable consumption decreased in the order of leafy > rootstalk > fruit vegetables with hazard index (HI) values of 0.61, 0.33 and 0.26, respectively. The HI values were all below 1, which indicates that there is a low risk of Greenhouse vegetable consumption. Soil threshold values (STVs) of heavy metals in GVP system were established according to the health risk assessment. The relatively lower transfer factors of rootstalk and fruit vegetables and higher STVs suggest that these types of vegetables are more suitable for cultivation in Greenhouse Soils. This study will provide an useful reference for controlling heavy metals and developing sustainable GVP.
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geochemical baseline establishment and ecological risk evaluation of heavy metals in Greenhouse Soils from dongtai china
Ecological Indicators, 2017Co-Authors: Kang Tian, Biao Huang, Zhe XingAbstract:Abstract Currently, heavy metal (HM) contamination in Greenhouse Soils is a significant concern due to the rapid expansion of Greenhouse agriculture. However, it is difficult to accurately assess HM pollution in Greenhouse Soils in China due to the lack of local geochemical baseline concentrations (GBCs) or corresponding background values. In the present study, the GBCs of HMs in Dongtai, a representative Greenhouse area of China, were established from subSoils using cumulative frequency distribution (CFD) curves. The pollution levels of HMs and potential ecological risks were investigated using different quantitative indices, such as geo-accumulation index (I geo ), pollution index (PI), pollution load index (PLI) and ecological risk index (RI), based on these regional GBCs. The total concentrations of six metals (Cd, Cr, Cu, Ni, Pb and Zn) in surface Soils were determined and shown to be lower than the concentrations reported in other Greenhouse regions of China. The GBCs of Cd, Cr, Cu, Ni, Pb and Zn were 0.059–0.092, 39.20–54.50, 12.52–15.57, 20.63–23.26, 13.43–16.62 and 43.02–52.65 mg kg −1 , respectively. Based on this baseline criterion, Cd, Pb and Zn accumulated in the surface Soils because they were present at concentrations higher than their baseline values. The Soils were moderately polluted by Cd according to the I geo values, and the PI results indicated that moderate Cd contamination was present in this area. The large variation of I geo value of Cd revealed that Cd in this area was likely influenced by agricultural activities. The PLI showed that most of the study area was moderately polluted. However, an analysis of the RI showed that the investigated HMs had low ecological risks. Correlation analysis and principle component analysis suggested that the Cd, Pb and Zn in the Greenhouse Soils mainly originated from anthropogenic sources (agricultural activities, atmospheric deposition etc.), while Cr, Cu, and Ni originated from natural sources. The findings of this study illustrated the necessity of GBC establishment at the local scale to facilitate more accurate HM evaluation of Greenhouse Soils. It is advisable to pay more attention to Cd, which could cause environmental problems in the Greenhouse system.
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Determination and evaluation of heavy metals in Soils under two different Greenhouse vegetable production systems in eastern China.
Chemosphere, 2016Co-Authors: Kang Tian, Wenyou Hu, Zhe Xing, Mengmeng Jia, Biao Huang, Mengxue WanAbstract:Abstract The evaluation of heavy metals (HMs) in Greenhouse Soils is crucial for both environmental monitoring and human health; thus, it is imperative to determine their concentrations, identify their sources and assess their potential risks. In this study, eight metals (As, Cd, Cr, Cu, Hg, Ni, Pb, and Zn) in 167 surface Soils were investigated in two representative Greenhouse vegetable systems of China: perennial solar Greenhouse (SG) and seasonal plastic Greenhouse (PG). The results indicated accumulations of Cd, Cu, Hg and Zn in the SG Soils and Cd, Pb, Hg and Zn in the PG Soils, with higher concentrations than the background values. In particular, Cd and Hg exhibited high levels of pollution under both GVP systems due to their positive Igeo values. Principle component analysis (PCA) and correlation analysis suggested that Cd, Cu, Hg and Zn in the SG Soils and Cd, Hg and Zn in the PG Soils were mainly related to intensive farming practices; Pb in the PG Soils was significantly affected by atmospheric deposition. The results showed that soil characteristics, in particular soil organic matter, total nitrogen and total phosphorus, exerted significant influence on Hg, Cu, Cd, and Zn under the SG system. However, the HMs in the PG Soils were weakly affected by soil properties. Overall, this study provides comparative research on the accumulation, potential risks and sources of HMs in two typical Greenhouse Soils in China, and our findings suggest that, Cd and Hg in both Greenhouse Soils could potentially represent environmental problems.
Yunxia Luan - One of the best experts on this subject based on the ideXlab platform.
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accumulation status sources and phytoavailability of metals in Greenhouse vegetable production systems in beijing china
Ecotoxicology and Environmental Safety, 2015Co-Authors: Jihua Wang, Ligang Pan, Xiaoyuan Feng, Yunxia LuanAbstract:The accumulation status, sources and phytoavailability of selected metals in Greenhouse vegetable production systems in peri-urban areas of Beijing were investigated. The mean concentrations of As, Cd, Cr, Hg and Pb in Greenhouse Soils were 8.44, 0.25, 69.0, 0.09 and 22.0 mg kg(-1), dw, respectively. According to principal component analysis, As, Cd, Cr and Hg are mainly from anthropogenic source, but Pb is likely from natural source. Metal concentrations in all vegetable samples were decreased in the order of Cr>As>Pb>Cd>Hg. Compared with root and fruit vegetables, leaf vegetables had relatively high concentrations and transfer factors of heavy metals, except for Cd. By including soil pH, OM and Greenhouse soil metals, 10 empirical models were derived using stepwise multiple linear regression analysis to predict heavy metal concentrations in the edible parts of different vegetables. Among the different vegetable groups, the highest intakes of metals occurred through consumption of leaf vegetables for the two age groups, except for Cd. The HI value of the studied metals were all below 1, indicating that consumption of vegetables grown in Greenhouse Soils was of low risk to consumers in our study area.
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occurrence of antibiotics in Soils and manures from Greenhouse vegetable production bases of beijing china and an associated risk assessment
Science of The Total Environment, 2015Co-Authors: Cheng Li, Ping Han, Yunxia Luan, Jiayi Chen, Jihua Wang, Anxiang LuAbstract:Abstract The occurrence of 15 antibiotics in soil and manure samples from 11 large-scale Greenhouse vegetable production (GVP) bases in Beijing, China was investigated. Results showed that the Greenhouse Soils were ubiquitously contaminated with antibiotics, and that antibiotic concentrations were significantly higher in Greenhouses than in open field Soils. The mean concentrations of four antibiotic classes decreased in the following order: tetracyclines (102 μg/kg) > quinolones (86 μg/kg) > sulfonamides (1.1 μg/kg) > macrolides (0.62 μg/kg). This investigation also indicated that fertilization with manure and especially animal feces might be the primary source of antibiotics. A risk assessment based on the calculated risk quotients (RQs) demonstrated that oxytetracycline, chlortetracycline, norfloxacin, ciprofloxacin and enrofloxacin could pose a high risk to soil organisms. These results suggested that the ecological effects of antibiotic contamination in GVP bases and their potential adverse risks on human health need to be given special attention.
Erko Stackebrandt - One of the best experts on this subject based on the ideXlab platform.
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Lysobacter niabensis sp. nov. and Lysobacter niastensis sp. nov., isolated from Greenhouse Soils in Korea
International Journal of Systematic and Evolutionary Microbiology, 2007Co-Authors: Hang-yeon Weon, Soon-wo Kwon, Byung-yong Kim, Min-kyeong Kim, Seung-hee Yoo, Erko StackebrandtAbstract:Two bacterial strains, designated GH34-4(T) and GH41-7(T), were isolated from Greenhouse soil cultivated with cucumber. The bacteria were strictly aerobic, Gram-negative, rod-shaped and oxidase- and catalase-positive. 16S rRNA gene sequence analysis indicated that these strains belong to the genus Lysobacter within the Gammaproteobacteria. Strain GH34-4(T) showed highest sequence similarity to Lysobacter yangpyeongensis GH19-3(T) (97.5 %) and Lysobacter koreensis Dae16(T) (96.4 %), and strain GH41-7(T) showed highest sequence similarity to Lysobacter antibioticus DSM 2044(T) (97.5 %), Lysobacter enzymogenes DSM 2043(T) (97.5 %) and Lysobacter gummosus ATCC 29489(T) (97.4 %). Levels of DNA-DNA relatedness indicated that strains GH34-4(T) and GH41-7(T) represented species clearly different from L. yangpyeongensis, L. antibioticus, L. enzymogenes and L. gummosus. The major cellular fatty acids of strains GH34-4(T) and GH41-7(T) were iso-C(16 : 0), iso-C(15 : 0) and iso-C(17 : 1)omega9c, and the major isoprenoid quinone was Q-8. The DNA G+C contents of GH34-4(T) and GH41-7(T) were 62.5 and 66.6 mol%, respectively. On the basis of the polyphasic taxonomic data presented, it is evident that each of these strains represents a novel species of the genus Lysobacter, for which the names Lysobacter niabensis sp. nov. (type strain GH34-4(T)=KACC 11587(T)=DSM 18244(T)) and Lysobacter niastensis sp. nov. (type strain GH41-7(T)=KACC 11588(T)=DSM 18481(T)) are proposed.
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Flavobacterium daejeonense sp. nov. and Flavobacterium suncheonense sp. nov., isolated from Greenhouse Soils in Korea
International Journal of Systematic and Evolutionary Microbiology, 2006Co-Authors: Byung-yong Kim, Hang-yeon Weon, Soon-wo Kwon, Seung-hee Yoo, Sylvie Cousin, Erko StackebrandtAbstract:Two yellow-pigmented, Gram-negative, rod-shaped bacterial strains, GH1-10(T) and GH29-5(T), were isolated from Greenhouse Soils in Korea. 16S rRNA gene sequence analysis indicated that these strains were related to members of the genus Flavobacterium. Strain GH1-10(T) was most closely related to Flavobacterium psychrolimnae and Flavobacterium denitrificans, with sequence similarities of 95.9 and 95.2 %, respectively. Strain GH29-5(T) was most closely related to "Flavobacterium saliodium", F. denitrificans and Flavobacterium frigoris, with sequence similarities of 94.3, 92.5 and 92.5 %, respectively. The major cellular fatty acids of GH1-10(T) were iso-C(15 : 0), summed feature 3 (iso-C(15 : 0) 2-OH and/or C(16 : 1)omega7c) and iso-C(17 : 0) 3-OH, and those of GH29-5(T) were iso-C(15 : 0), iso-C(17 : 0) 3-OH, iso-C(15 : 1) G and iso-C(15 : 0) 3-OH. Both strains contained menaquinone with six isoprene units (MK-6) as the sole quinone. The DNA G+C contents of GH1-10(T) and GH29-5(T) were 35 and 39 mol%, respectively. Based on the phylogenetic and phenotypic data presented, it is concluded that the two bacteria represent two separate novel species of the genus Flavobacterium. The names proposed to accommodate these organisms are Flavobacterium daejeonense sp. nov., with type strain GH1-10(T) (=KACC 11422(T)=DSM 17708(T)), and Flavobacterium suncheonense sp. nov., with type strain GH29-5(T) (=KACC 11423(T)=DSM 17707(T)).
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Two novel species, Lysobacter daejeonensis sp. nov. and Lysobacter yangpyeongensis sp. nov., isolated from Korean Greenhouse Soils
International Journal of Systematic and Evolutionary Microbiology, 2006Co-Authors: Hang-yeon Weon, Soon-wo Kwon, Byung-yong Kim, Seung-hee Yoo, Youn-kyung Baek, Erko StackebrandtAbstract:Two bacterial strains were isolated from Greenhouse Soils of Daejeon and Yangpyeong regions in Korea. The strains, designated GH1-9T and GH19-3T, were Gram-negative and aerobic, with rod-shaped cells. Their DNA G+C contents were 61.7 and 67.3 mol%, respectively. The major fatty acids of strain GH1-9T were iso-C16 : 0, iso-C15 : 0, iso-C14 : 0, iso-C17 : 1omega9c and iso-C11 : 0 3-OH and the major components of strain GH19-3T were iso-C16 : 0, iso-C15 : 0, C16 : 1omega7c alcohol, iso-C17 : 1omega9c and iso-C11 : 0 3-OH. None of the species of the genus Lysobacter with validly published names showed 16S rRNA gene sequence similarity values of more than 97 % with respect to the novel isolates. The closest sequence similarity of strain GH1-9T was with Lysobacter concretion is DSM 16239T (96.4 %), whereas strain GH19-3T showed the highest sequence similarity with Lysobacter enzymogenes DSM 2043T (96.6 %). Polyphasic taxonomic studies indicated that the two strains should be classified as representing novel members of the genus Lysobacter. The names Lysobacter daejeonensis sp. nov. and Lysobacter yangpyeongensis sp. nov. are proposed, with strains GH1-9T (=KACC 11406T=DSM 17634T) and GH19-3T (=KACC 11407T=DSM 17635T), respectively, as the type strains.
