Arsenic speciation in turnip as affected by application of chicken manure bearing roxarsone and its metabolites

文献类型： 外文期刊

第一作者： Yao, Lixian

作者： Yao, Lixian;Li, Guoliang;He, Zhaohuan;Zhou, Changmin;Yang, Baomei;Yao, Lixian;Dang, Zhi

作者机构：

关键词： roxarsone;animal manures

期刊名称：PLANT AND SOIL （ 影响因子：4.192； 五年影响因子：4.712 ）

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收录情况： SCI

摘要： Roxarsone (ROX) is widely used as a feed additive in intensive animal production. While animals are fed with ROX, the most commonly detectable As forms in fresh manures include ROX and small quantities of its metabolites such as arsenate (As(V)), arsenite (As(III)), monomethylarsonic acid (MMA) and dimethylarsinic acid (DMA). A pot experiment was conducted to investigate the uptake, translocation and distribution of ROX, As(V), As(III), MMA and DMA in turnips, with the soil amended with 2% and 3% (w/w) chicken manure (CM) bearing ROX and its metabolites. Soil without any fertilizer was the control. The results show that only As(V) and As(III) were detected in turnip control samples. As(V), As(III) and DMA were found in all CM applied samples, but not ROX or MMA. This implies that turnip cannot take up ROX directly and accumulate MMA at detectable levels. The contents of DMA in tubers and the three As species in shoots increased with the CM rate in contrast to reduced levels of As(V) and As(III) in tubers. Increased CM rate enhanced the translocation of the three As species, especially for DMA, from tubers to shoots. DMA was the major form (42.9-61.4% in tubers and 38.1-76.3% in shoots), followed by As(III), in turnip plants fertilized with CM. The results indicate that ROX and its metabolites in animal manures can be introduced into human food chain by the way ROX [rightward arrow] animal [rightward arrow] manure [rightward arrow] soil [rightward arrow] crop.

分类号： Q948

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