title: Effects of oxalate and phosphate on the release of arsenic from contaminated soils and arsenic accumulation in wheat.
abstract: Oxalate is exuded by plants in the rhizosphere and plays an important role in the soil/root interactions. Phosphate fertilizer is widely used all over the world and may influence the behavior of arsenic (As) in soils. In this study oxalate and phosphate were used as extractants to investigate their effects on the release of As from three As-contaminated soils and the chemical speciation of As. Concentrations of arsenite (As(III)) and arsenate (As(V)) released progressively increased by increasing the concentrations of oxalate or phosphate. The released As(V) content was higher than that of As(III) and the differences between As(V) and As(III) released by oxalate was more obvious than by phosphate. Greenhouse experiment was conducted to evaluate the effects of oxalate and phosphate on As uptake by wheat (Triticum vulgare L.). Addition of oxalate or phosphate resulted in the increase of As accumulation in both wheat root and shoot and the effect of phosphate was more obvious than that of oxalate.
authors.affiliation: State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, China.
authors.forename: Yuqiang
authors.initials: Y
authors.lastname: Tao
authors.forename: Shuzhen
authors.initials: S
authors.lastname: Zhang
authors.forename: Wei
authors.initials: W
authors.lastname: Jian
authors.forename: Chungang
authors.initials: C
authors.lastname: Yuan
authors.forename: Xiao-quan
authors.initials: XQ
authors.lastname: Shan
mesh_terms: D001151:Arsenic / Q000737:chemistry / Q000378:metabolism*; D010070:Oxalates / Q000737:chemistry / Q000494:pharmacology*; D010710:Phosphates / Q000737:chemistry / Q000494:pharmacology*; D018517:Plant Roots / Q000187:drug effects; D018520:Plant Shoots / Q000187:drug effects; D012989:Soil Pollutants / Q000737:chemistry / Q000494:pharmacology*; D013997:Time Factors; D014908:Triticum / Q000187:drug effects* / Q000378:metabolism
chemical_list: D010070:Oxalates; D010710:Phosphates; D012989:Soil Pollutants; D001151:Arsenic