Effects of oxalate and phosphate on the release of arsenic from contaminated soils and arsenic accumulation in wheat.
Effects of oxalate and phosphate on the release of arsenic from contaminated soils and arsenic accumulation in wheat.
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DOI：
10.1016/j.chemosphere.2006.04.039
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发表时间：
2006-11
期刊：
影响因子：
8.8
通讯作者：
Yuqiang Tao;Shuzhen Zhang;Wei Jian;Chungang Yuan;X. Shan
中科院分区：
文献类型：
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作者：
Yuqiang Tao;Shuzhen Zhang;Wei Jian;Chungang Yuan;X. Shan
草酸盐是植物根际分泌的物质，在土壤/根系相互作用中起重要作用。磷肥在世界范围内广泛使用，并可能影响土壤中砷的行为。本研究以草酸盐和磷酸盐为萃取剂，研究了它们对三种砷污染土壤中砷释放的影响以及砷的化学形态。释放的亚砷酸盐（As(III)）和砷酸盐（As(V)）的浓度随着草酸盐或磷酸盐浓度的增加而逐渐增加。释放的As(V)含量高于As(III)，草酸释放的As(V)和As（III）的差异比磷酸盐释放的As(V)更明显。通过温室试验，研究了草酸盐和磷酸盐对小麦吸收砷的影响。添加草酸盐和磷酸盐均增加了小麦根和茎的砷积累，且磷酸盐的作用比草酸盐的作用更明显。
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.