The Experts below are selected from a list of 52920 Experts worldwide ranked by ideXlab platform
Peter Christie - One of the best experts on this subject based on the ideXlab platform.
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aluminum toxicity decreases the phytoextraction capability by cadmium zinc hyperaccumulator sedum plumbizincicola in Acid Soils
Science of The Total Environment, 2020Co-Authors: Jiawen Zhou, Tong Zhou, Zaijun Xin, Yongming Luo, Peter ChristieAbstract:Abstract Excessive aluminum (Al) in Acid Soils or Al released due to Acidification during repeated phytoextraction might impair the phytoextraction efficiency of hyperaccumulators but this is often neglected. Here, we investigate for the first time the toxicity of Al to the cadmium (Cd) and zinc (Zn) hyperaccumulator Sedum plumbizincicola with hydroponics experiments both in the long (7 weeks) and short terms (72 h), and in soil conditions in a pot experiment. In the long-term hydroponics experiment, observable toxic effects of Al were found even at
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repeated phytoextraction of four metal contaminated Soils using the cadmium zinc hyperaccumulator sedum plumbizincicola
Environmental Pollution, 2014Co-Authors: Yongming Luo, Hao Zhang, Peter ChristieAbstract:A cadmium/zinc hyperaccumulator extracted metals from four contaminated Soils over three years in a glasshouse experiment. Changes in plant metal uptake and soil total (aqua regia-extractable) and available metals were investigated. Plant Cd concentrations in a high-Cd Acid soil and plant Zn concentrations in two Acid Soils decreased during repeated phytoextraction and were predicted by soil available metal concentrations. However, on repeated phytoextraction, plant Cd concentrations remained constant in lightly Cd-polluted Acid Soils, as did plant Cd and Zn in alkaline Soils, although soil available metal concentrations decreased markedly. After phytoextraction Acid Soils showed much higher total metal removal efficiencies, indicating possible suitability of phytoextraction for Acid Soils. However, DGT-testing, which takes soil metal re-supply into consideration, showed substantial removal of available metal and distinct decreases in metal supply capacity in alkaline Soils after phytoextraction, suggesting that a strategy based on lowering the bioavailable contaminant might be feasible.
M L Andrade - One of the best experts on this subject based on the ideXlab platform.
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simultaneous sorption and desorption of cd cr cu ni pb and zn in Acid Soils i selectivity sequences
Journal of Hazardous Materials, 2007Co-Authors: Emma F Covelo, F A Vega, M L AndradeAbstract:The sorption and desorption of six heavy metals by and from the surface or immediately subsurface horizons of eleven Acid Soils of Galicia (N.W. Spain) were characterized by means of batch experiments in which the initial sorption solution contained identical mass concentrations of each metal. Concentration-dependent coefficients K(d) were calculated for the distribution of the metals between the soil and solution phases, and the values obtained for initial sorption solution concentrations of 100mgL(-1) of each metal (K(d100)) were used, for each soil, to order the metals as regards their sorption and retention. Pb and Cu were sorbed and retained to a greater extent than Cd, Ni or Zn, which had low K(d100) values. Pb was sorbed more than any other metal. Cr was generally sorbed only slightly more than Cd, Ni or Zn, but was strongly retained, with K(d100) (retention) values greater than those of Pb and Cu in Soils with very low CEC (<3cmol((+))kg(-1)). The sorption of Pb and Cu correlated with organic matter content, while the retention of these and the other metals considered appeared to depend on clay minerals, especially kaolinite, gibbsite, and vermiculite.
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simultaneous sorption and desorption of cd cr cu ni pb and zn in Acid Soils ii soil ranking and influence of soil characteristics
Journal of Hazardous Materials, 2007Co-Authors: Emma F Covelo, F A Vega, M L AndradeAbstract:Abstract In Part I of this paper we reported, for each of 11 Acid Soils, the rankings of six metals according to their sorption from solutions containing all six, and according to their retention under desorption conditions. Here, we analyse the same data from a different perspective: for each metal, we rank the Soils by their capacities to sorb and retain it as reflected by soil/solution distribution coefficients K d100 measured using starting solutions containing 100 mg L −1 of each metal. We also ranked the Soils for overall heavy metal sorption and retention capacities using Kaplan's compound measure K dΣ , and we investigated the influence of soil characteristics on K d100 and K dΣ100 values. Overall capacity for sorption of heavy metals was positively related to HOM, kaolinite and Fe oxides contents, and negatively related to CEC and to vermiculite and haematite contents. Overall capacity for retention of heavy metals was positively related to HOM and kaolinite contents, and negatively related to CEC and vermiculite content. The good correlation between K dΣ100 (sorption) and the first component extracted in a principal components analysis of K d100 (sorption) values, and between K dΣ100 (retention) and the first component extracted in a principal components analysis of K d100 (retention) values, supports the adequacy of K dΣ as a measure of the overall capacity of a soil to sorb or retain heavy metals.
Yongming Luo - One of the best experts on this subject based on the ideXlab platform.
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aluminum toxicity decreases the phytoextraction capability by cadmium zinc hyperaccumulator sedum plumbizincicola in Acid Soils
Science of The Total Environment, 2020Co-Authors: Jiawen Zhou, Tong Zhou, Zaijun Xin, Yongming Luo, Peter ChristieAbstract:Abstract Excessive aluminum (Al) in Acid Soils or Al released due to Acidification during repeated phytoextraction might impair the phytoextraction efficiency of hyperaccumulators but this is often neglected. Here, we investigate for the first time the toxicity of Al to the cadmium (Cd) and zinc (Zn) hyperaccumulator Sedum plumbizincicola with hydroponics experiments both in the long (7 weeks) and short terms (72 h), and in soil conditions in a pot experiment. In the long-term hydroponics experiment, observable toxic effects of Al were found even at
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effects of amendments on the alleviation of aluminum toxicity and cadmium and zinc uptake by sedum plumbizincicola in Acid Soils
Chinese Journal of Biotechnology, 2020Co-Authors: Siyu Chen, Jiawen Zhou, Yongming Luo, Hongyan Liu, Zaijun XinAbstract:To explore the effects of some chemical amendments on the plant growth and phytoextraction efficiencies of cadmium (Cd)/zinc (Zn) hyper accumulator Sedum plumbizincicola in Acid Soils with high aluminum (Al) toxicity, a greenhouse pot experiment was conducted. Different kinds and dosages of amendments including calciummagnesium-phosphorus fertilizer (CMP), magnesium carbonate (MgCO₃), potassium dihydrogen phosphate (KH₂POPO₄ ) were added. The results showed that CMP and MgCO₃ increased soil pH and decreased soil exchangeable Al concentration to some extent, while KH₂PO₄ reduced soil exchangeable Al concentration but had little effect on increasing soil pH. Proper application (9.39 mg/kg) of CMP could improve the biomass and Cd and Zn phytoextraction efficiencies by S. plumbizincicola but it would inhibit plant growth and phytoextraction performance when exceeding 9.39 mg/kg. MgCO₃ addition enhanced plant metal uptake while KH₂PO₄ presented an opposite effect. It suggests that using CMP and MgCO₃ could alleviate Al toxicity to S. plumbizincicola in Acid Soils and maintain relatively high metal extraction efficiency.
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repeated phytoextraction of four metal contaminated Soils using the cadmium zinc hyperaccumulator sedum plumbizincicola
Environmental Pollution, 2014Co-Authors: Yongming Luo, Hao Zhang, Peter ChristieAbstract:A cadmium/zinc hyperaccumulator extracted metals from four contaminated Soils over three years in a glasshouse experiment. Changes in plant metal uptake and soil total (aqua regia-extractable) and available metals were investigated. Plant Cd concentrations in a high-Cd Acid soil and plant Zn concentrations in two Acid Soils decreased during repeated phytoextraction and were predicted by soil available metal concentrations. However, on repeated phytoextraction, plant Cd concentrations remained constant in lightly Cd-polluted Acid Soils, as did plant Cd and Zn in alkaline Soils, although soil available metal concentrations decreased markedly. After phytoextraction Acid Soils showed much higher total metal removal efficiencies, indicating possible suitability of phytoextraction for Acid Soils. However, DGT-testing, which takes soil metal re-supply into consideration, showed substantial removal of available metal and distinct decreases in metal supply capacity in alkaline Soils after phytoextraction, suggesting that a strategy based on lowering the bioavailable contaminant might be feasible.
Jun Jiang - One of the best experts on this subject based on the ideXlab platform.
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characteristics of biomass ashes from different materials and their ameliorative effects on Acid Soils
Journal of Environmental Sciences-china, 2017Co-Authors: Renyong Shi, Jun Jiang, Khalid Mehmood, Yuan Liu, Wei QianAbstract:The chemical characteristics, element contents, mineral compositions, and the ameliorative effects on Acid Soils of five biomass ashes from different materials were analyzed. The chemical properties of the ashes varied depending on the source biomass material. An increase in the concrete shuttering contents in the biomass materials led to higher alkalinity, and higher Ca and Mg levels in biomass ashes, which made them particularly good at ameliorating effects on soil Acidity. However, heavy metal contents, such as Cr, Cu, and Zn in the ashes, were relatively high. The incorporation of all ashes increased soil pH, exchangeable base cations, and available phosphorus, but decreased soil exchangeable Acidity. The application of the ashes from biomass materials with a high concrete shuttering content increased the soil available heavy metal contents. Therefore, the biomass ashes from wood and crop residues with low concrete contents were the better Acid soil amendments.
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pH buffering capacity of Acid Soils from tropical and subtropical regions of China as influenced by incorporation of crop straw biochars
Journal of Soils and Sediments, 2012Co-Authors: An-zhen Zhao, Jin-hua Yuan, Jun JiangAbstract:Purpose The key factors influencing pH buffering capacity of Acid Soils from tropical and subtropical regions, and effects of soil evolution and incorporation of biochars on pH buffering capacity were investigated to develop suitable methods to increase pH buffering capacity of Acid Soils.
Emma F Covelo - One of the best experts on this subject based on the ideXlab platform.
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simultaneous sorption and desorption of cd cr cu ni pb and zn in Acid Soils i selectivity sequences
Journal of Hazardous Materials, 2007Co-Authors: Emma F Covelo, F A Vega, M L AndradeAbstract:The sorption and desorption of six heavy metals by and from the surface or immediately subsurface horizons of eleven Acid Soils of Galicia (N.W. Spain) were characterized by means of batch experiments in which the initial sorption solution contained identical mass concentrations of each metal. Concentration-dependent coefficients K(d) were calculated for the distribution of the metals between the soil and solution phases, and the values obtained for initial sorption solution concentrations of 100mgL(-1) of each metal (K(d100)) were used, for each soil, to order the metals as regards their sorption and retention. Pb and Cu were sorbed and retained to a greater extent than Cd, Ni or Zn, which had low K(d100) values. Pb was sorbed more than any other metal. Cr was generally sorbed only slightly more than Cd, Ni or Zn, but was strongly retained, with K(d100) (retention) values greater than those of Pb and Cu in Soils with very low CEC (<3cmol((+))kg(-1)). The sorption of Pb and Cu correlated with organic matter content, while the retention of these and the other metals considered appeared to depend on clay minerals, especially kaolinite, gibbsite, and vermiculite.
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simultaneous sorption and desorption of cd cr cu ni pb and zn in Acid Soils ii soil ranking and influence of soil characteristics
Journal of Hazardous Materials, 2007Co-Authors: Emma F Covelo, F A Vega, M L AndradeAbstract:Abstract In Part I of this paper we reported, for each of 11 Acid Soils, the rankings of six metals according to their sorption from solutions containing all six, and according to their retention under desorption conditions. Here, we analyse the same data from a different perspective: for each metal, we rank the Soils by their capacities to sorb and retain it as reflected by soil/solution distribution coefficients K d100 measured using starting solutions containing 100 mg L −1 of each metal. We also ranked the Soils for overall heavy metal sorption and retention capacities using Kaplan's compound measure K dΣ , and we investigated the influence of soil characteristics on K d100 and K dΣ100 values. Overall capacity for sorption of heavy metals was positively related to HOM, kaolinite and Fe oxides contents, and negatively related to CEC and to vermiculite and haematite contents. Overall capacity for retention of heavy metals was positively related to HOM and kaolinite contents, and negatively related to CEC and vermiculite content. The good correlation between K dΣ100 (sorption) and the first component extracted in a principal components analysis of K d100 (sorption) values, and between K dΣ100 (retention) and the first component extracted in a principal components analysis of K d100 (retention) values, supports the adequacy of K dΣ as a measure of the overall capacity of a soil to sorb or retain heavy metals.
