College of Natural Resources and Environment, South China Agricultural University, Wushan, Tianhe, Guangzhou, 510642, China,
Environ Sci Pollut Res Int. 2015 Mar;22(6):4654-9. doi: 10.1007/s11356-014-3711-0. Epub 2014 Oct 21.
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∼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.
罗欧砷（ROX）是一种在动物生产中被广泛用作饲料有机砷添加剂的物质，它可以以自身及其代谢物的形式从动物粪便中排出。动物粪便通常与磷（P）肥料一起施用于土地，以提高农业中磷的植物可利用性。我们研究了用含有 ROX 及其代谢物的 1%（w/w，粪便/土壤）鸡粪（分别为 0、0.05、0.1、0.2、0.4 和 0.8 g P2O5/kg）施肥的花环菊花（C. coronarium）植物中砷形态的积累。结果表明，As(III)是花环菊花茎叶中唯一的砷化合物，而 As(III)和 As(V)可在根部检测到。较高的磷酸盐水平通过根际竞争解吸为花环菊花根系提供了更多的 As(V)，从而显著增加了植物中砷形态的积累。As(III)是植物中主要的砷形态（85.0∼90.6%）。磷酸盐不能改变植物中砷形态的分配。因此，传统的动物粪便施磷肥料的做法可能会通过 ROX→动物→动物粪便→土壤→作物的途径，无意中增加作物中砷污染的潜在风险。
