Phosphate enhances uptake of As species in garland chrysanthemum (C-coronarium) applied with chicken manure bearing roxarsone and its metabolites

文献类型： 外文期刊

第一作者： Deng, Xiancai

作者： Deng, Xiancai;Huang, Lianxi;He, Zhaohuan;Zhou, Changming;Li, Guoliang

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关键词： Roxarsone;Animalmanure;Phosphorous fertilizer;As species;Phytoavailability

期刊名称：ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH （ 影响因子：4.223； 五年影响因子：4.306 ）

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收录情况： SCI

摘要： Roxarsone (ROX), a world widely used feed organoarsenic additive in animal production, can be excreted as itself and its metabolites in animal manure. Animal manure is commonly land applied with phosphorous (P) fertilizer to enhance the P phytoavailability in agriculture. We investigated the accumulation of As species in garland chrysanthemum (C. coronarium) plants fertilized with 1 % (w/w, manure/soil) chicken manure bearing ROX and its metabolites, plus 0, 0.05, 0.1, 0.2, 0.4, and 0.8 g P2O5/kg, respectively. The results show that As(III) was the sole As compound in garland chrysanthemum shoots, and As(III) and As(V) were detectable in roots. Elevated phosphate level supplied more As(V) for garland chrysanthemum roots through competitive desorption in rhizosphere, leading to significantly enhanced accumulation of As species in plants. As(III) was the predominant As form in plants (85.0 similar to 90.6 %). Phosphate could not change the allocation of As species in plants. Hence, the traditional practice that animal manure is applied with P fertilizer may inadvertently increase the potential risk of As contamination in crop via the way ROX -> animal -> animal manure -> soil -> crop.

分类号： X5`X

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