The Experts below are selected from a list of 315 Experts worldwide ranked by ideXlab platform
Hirofumi Hinode - One of the best experts on this subject based on the ideXlab platform.
-
The use of synthesized zeolites from power plant rice husk ash obtained from Thailand as adsorbent for Cadmium Contamination removal from zinc mining
Journal of Environmental Chemical Engineering, 2015Co-Authors: Chawikarn Santasnachok, Winarto Kurniawan, Hirofumi HinodeAbstract:Abstract The people from the 12 villages near the zinc mining in Mae Sot District, Tak Province, and Northwest of Thailand, were suffering Contamination with Cadmium (Cd2+). It was released into the main source of water supply, Mae Taw River, which also be used for agriculture. This represents a serious problem that should be addressed accordingly. This study aims to investigate the synthesized zeolite from agriculture waste by-product in Thailand such as; rice husk ash (RHA) with white part is containing high silica content which can be used as a potential zeolites precursor and used to solve the problem by removing Cadmium in aqueous solution via batch experiments. The removal of Cd2+ in the concentration range of 50–500 mg/L. The maximum removal capacity of synthesized zeolite Na−A and Na−X for Cd2+ were found to be 736.38 and 684.46 mg/g, respectively. The result was compared to synthetic zeolite 3A commercial shown that synthesized zeolites from RHA have high removal capacity close to commercial one of 753.58 mg/g using 0.3 g/L dosage of zeolite and consistent with an endothermic reaction, an increase in the temperature (20–40 °C) resulted in increasing Cadmium adsorption rate. Therefore, the synthesized zeolites from RHA have high potential to remove Cadmium Contamination in water.
Li Suxia - One of the best experts on this subject based on the ideXlab platform.
-
Effects of Three Soil Amendment on Quality of Tomato in Interaction of Nitrogen Nutrition and Cadmium Contamination
Journal of Wuhan Bioengineering Institute, 2011Co-Authors: Li SuxiaAbstract:The tomato quality,nitrate and Cadmium in tomato were studied by applying three soil amendment (dicyandiamide,lime and organic fertilizer) under interactive effects of nitrogen application and Cadmium Contamination in field experiments.The results showed that the three soil amendment all could increase the contents of dry matter,glucose and sucrose,but decrease the level of soluble sugar.Liming treatment significantly reduced the protein and citric acid contents,but the other two were contrary. Applying dicyandiamide could significantly decrease vitamin C,but lime and organic fertilizer were contrary. Applying dicyandiamide and lime could significantly decrease the contents of nitrate and Cadmium in the tomato,but organic fertilizer was contrary.
-
Effects of Three Soil Amendment on Quality of Pepper in Interaction of Nitrogen Nutrition and Cadmium Contamination Soil
Journal of Wuhan Bioengineering Institute, 2011Co-Authors: Li SuxiaAbstract:The effects of three soil amendment(organic fertilizer,dicyandiamide and lime) on quality of pepper in interaction of nitrogen nutrition and Cadmium Contamination soil were studied through pot and field experiments.The results showed that the organic fertilizer could significantly raise the contents of the dry matter and chlorophyll in pepper Compared with CK,and the three modifiers could all decrease the contents of Vc,soluble sugar,soluble protein,Cd and nitrate.The influence order on the Vc was CKlimeorganic fertilizerdicyandiamide,but in the pot experiment,there was not significant difference among the lime,organic fertilizer and CK.The influence order on the soluble protein was CKdicyandiamidelimeorganic fertilizer,and in the pot experiment the difference between the dicyandiamide and lime was not significant and in the field experiment the three improving treatments were not significant difference.The influence order on the soluble sugar was CKorganic fertilizersdicyandiamidelime,and in the field experiment the difference between the dicyandiamide and lime was not significant. Compared with CK,organic fertilizer,lime and dicyandiamide could make the contents of Cd in the pepper decrease 5.37%,30.99%and 35.95%(in the pot experiment ),and 52.75%,84.62%and 86.26%(in the field experiment),respectively;dicyandiamide,organic fertilizer and lime could make the contents of nitrate in the pepper decrease 21.78%,31.37%and 35.90%(in the pot experiment),and 12.67%,25.51%and 34.68%(in the field experiment),respectively.
-
Effects of Three Soil Amendment on Soil Enzyme Activities in Interaction of Nitrogen Application and Cadmium Contamination
Journal of Wuhan Bioengineering Institute, 2010Co-Authors: Li SuxiaAbstract:The effects of three soil amendment(lime,organic fertilizer and dicyandiamide) on soil enzyme activities in interaction of nitrogen application and Cadmium Contamination are studied through field experiments.The results showed that it should be applied dicyandiamide first,then lime and organic fertilizer at last in interaction of nitrogen application and Cadmium Contamination,comprehensively considered with different effects of activities of four enzymes(sucrase,urease,protease and apase) by using the three soil amendment.
-
Interactive Effects of Nitrogen Fertilizer Application and Cadmium Contamination on Growth and Quality of Amaranth
Journal of Wuhan Bioengineering Institute, 2009Co-Authors: Li SuxiaAbstract:A pot experiment was conducted to study effects of nitrogen application and Cadmium Contamination on growth and quality of amaranth(Amaranthus mangostanus L).The results showed that the low concentration of Cadmium(0.5 mg/kg) and nitrogen(0.2 g/kg) was very significant to promote the growth of amaranth.In the four levels of Cadmium Contamination nitrogen fertilizer application significantly promoted the growth of amaranth.In the level of Cadmium Contamination it can be very significant increase in vitamin C(Vc) and soluble sugar synthesis,and inhibite the synthesis of soluble protein. Nitrogen application significantly inhibited Vc and soluble sugar synthesis,promoted chlorophyll synthesis and increased soluble protein in amaranth,There was a significantly positive correlation between the Cadmium and nitrate content in amaranth and that in soil.Nitrogen(0.2 g/kg) significantly inhibited Cadmium absorption in amaranth.
A. Hamza-chaffai - One of the best experts on this subject based on the ideXlab platform.
-
The effect of in situ Cadmium Contamination on some biomarkers in Cerastoderma glaucum
Ecotoxicology, 2008Co-Authors: M. Machreki-ajmi, I. Ketata, R. Ladhar-chaabouni, A. Hamza-chaffaiAbstract:The present study was designed to detect in situ effects of Cadmium on marine organisms Cerastoderma glaucum from the gulf of Gabès (Tunisia). Six sampling stations were chosen: one site, relatively far from known local source of pollution, was considered as uncontaminated site and five sites clearly exposed to anthropogenic impact. Metallothionein like protein (MTLP) and sub-cellular metal partitioning were measured in cockles ( C. glaucum ) gills and digestive gland. Various biomarkers were also measured, including malondialdehyde (MDA) in the digestive gland and acetylcholinesterase activity (AChE) in the remainder. The health status of the cockles was assessed by using the condition index (CI). Significant differences between sites were noted for Cd concentrations, (CI) and also for the three studied biomarkers. Significant higher biomarkers response was measured in cockles from stations located in the northern part of the gulf, which are exposed directly to industrial and urban effluents, whereas the response of most biomarkers was minimal at the reference station. Positive and significant correlations were observed between MTLP and Cd concentrations in the digestive gland and in the gills. However, it must be noted that these correlations were more significant in the digestive gland, suggesting that compared to the gills, the digestive gland of C. glaucum is more suitable for monitoring metal pollution. The subcellular distribution of Cd showed that the soluble fraction was the major compartment for Cd storage, a pattern which is due to the role of MTLP in Cd detoxication. But at the most contaminated site (EH), Cadmium in the digestive gland was preferentially accumulated in the insoluble fraction (P1) suggesting that the MTLP capacity in binding metals was not sufficient to avoid the binding of Cd to the insoluble fraction. Furthermore, the MTLP concentrations in the cockles from this site are lower than expected. So in highly polluted sites, MTLP in C. glaucum should not be used as a useful biomarker for metal pollution. The lipid peroxidation as presented by malondialdehyde levels, and MT-like protein concentrations increased in cockles exposed to Cadmium Contamination. We can, therefore, hypothesize that Cd could induce MTLP synthesis and MDA increase. While AChE had distinct and specific pattern showing that Cadmium is not the only factor of the inhibition of cholinesterase activity. There are other polluting inputs engendering this inhibition.
-
The effect of in situ Cadmium Contamination on some biomarkers in Cerastoderma glaucum.
Ecotoxicology (London England), 2007Co-Authors: M. Machreki-ajmi, I. Ketata, R. Ladhar-chaabouni, A. Hamza-chaffaiAbstract:The present study was designed to detect in situ effects of Cadmium on marine organisms Cerastoderma glaucum from the gulf of Gabes (Tunisia). Six sampling stations were chosen: one site, relatively far from known local source of pollution, was considered as uncontaminated site and five sites clearly exposed to anthropogenic impact. Metallothionein like protein (MTLP) and sub-cellular metal partitioning were measured in cockles (C. glaucum) gills and digestive gland. Various biomarkers were also measured, including malondialdehyde (MDA) in the digestive gland and acetylcholinesterase activity (AChE) in the remainder. The health status of the cockles was assessed by using the condition index (CI). Significant differences between sites were noted for Cd concentrations, (CI) and also for the three studied biomarkers. Significant higher biomarkers response was measured in cockles from stations located in the northern part of the gulf, which are exposed directly to industrial and urban effluents, whereas the response of most biomarkers was minimal at the reference station. Positive and significant correlations were observed between MTLP and Cd concentrations in the digestive gland and in the gills. However, it must be noted that these correlations were more significant in the digestive gland, suggesting that compared to the gills, the digestive gland of C. glaucum is more suitable for monitoring metal pollution. The subcellular distribution of Cd showed that the soluble fraction was the major compartment for Cd storage, a pattern which is due to the role of MTLP in Cd detoxication. But at the most contaminated site (EH), Cadmium in the digestive gland was preferentially accumulated in the insoluble fraction (P1) suggesting that the MTLP capacity in binding metals was not sufficient to avoid the binding of Cd to the insoluble fraction. Furthermore, the MTLP concentrations in the cockles from this site are lower than expected. So in highly polluted sites, MTLP in C. glaucum should not be used as a useful biomarker for metal pollution. The lipid peroxidation as presented by malondialdehyde levels, and MT-like protein concentrations increased in cockles exposed to Cadmium Contamination. We can, therefore, hypothesize that Cd could induce MTLP synthesis and MDA increase. While AChE had distinct and specific pattern showing that Cadmium is not the only factor of the inhibition of cholinesterase activity. There are other polluting inputs engendering this inhibition.
Chawikarn Santasnachok - One of the best experts on this subject based on the ideXlab platform.
-
The use of synthesized zeolites from power plant rice husk ash obtained from Thailand as adsorbent for Cadmium Contamination removal from zinc mining
Journal of Environmental Chemical Engineering, 2015Co-Authors: Chawikarn Santasnachok, Winarto Kurniawan, Hirofumi HinodeAbstract:Abstract The people from the 12 villages near the zinc mining in Mae Sot District, Tak Province, and Northwest of Thailand, were suffering Contamination with Cadmium (Cd2+). It was released into the main source of water supply, Mae Taw River, which also be used for agriculture. This represents a serious problem that should be addressed accordingly. This study aims to investigate the synthesized zeolite from agriculture waste by-product in Thailand such as; rice husk ash (RHA) with white part is containing high silica content which can be used as a potential zeolites precursor and used to solve the problem by removing Cadmium in aqueous solution via batch experiments. The removal of Cd2+ in the concentration range of 50–500 mg/L. The maximum removal capacity of synthesized zeolite Na−A and Na−X for Cd2+ were found to be 736.38 and 684.46 mg/g, respectively. The result was compared to synthetic zeolite 3A commercial shown that synthesized zeolites from RHA have high removal capacity close to commercial one of 753.58 mg/g using 0.3 g/L dosage of zeolite and consistent with an endothermic reaction, an increase in the temperature (20–40 °C) resulted in increasing Cadmium adsorption rate. Therefore, the synthesized zeolites from RHA have high potential to remove Cadmium Contamination in water.
Pierre Goovaerts - One of the best experts on this subject based on the ideXlab platform.
-
evaluating the probability of exceeding a site specific soil Cadmium Contamination threshold
Geoderma, 2001Co-Authors: M Van Meirvenne, Pierre GoovaertsAbstract:A non-parametric approach for assessing the probability that heavy metal concentrations in soil exceed a location-specific environmental threshold is presented. The methodology is illustrated for an airborne Cd-contaminated area in Belgium. Non-stationary simple indicator kriging, using a soft indicator coding to account for analytical uncertainty, was used in combination with declustering weights to construct the local conditional cumulative distribution function (ccdf) of Cd. The regulatory Cd Contamination threshold (CT) depends on soil organic matter and clay content, which entails that its value is not constant across the study area and also is uncertain. Therefore, soft indicator kriging was used to construct the ccdfs of organic matter and clay. Latin hypercube sampling of the ccdfs of Cd, soil organic matter and clay yielded a map of the probability that Cd concentrations exceed the site-specific CT. Cross-validation showed that the ccdfs provide accurate models of the uncertainty about these variables. At a probability level of 80% we found that the CT was exceeded at 27.3% of the interpolated locations, covering 3192 ha of the study area, illustrating the extent of the pollution. Additionally, a new methodology is proposed to sample preferentially the locations where the uncertainty about the probability of exceeding the CT, instead of the uncertainty about the pollutant itself, is at a maximum. This methodology was applied in a two-stage sampling campaign to identify locations where additional Cd samples should be collected in order to improve the classification into safe and contaminated locations.
