title: Phosphate enhances uptake of As species in garland chrysanthemum (C. coronarium) applied with chicken manure bearing roxarsone and its metabolites.
abstract: 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.
authors.affiliation: College of Natural Resources and Environment, South China Agricultural University, Wushan, Tianhe, Guangzhou, 510642, China, lyaolx@scau.edu.cn.
authors.forename: Lixian
authors.initials: L
authors.lastname: Yao
authors.forename: Lianxi
authors.initials: L
authors.lastname: Huang
authors.forename: Zhaohuan
authors.initials: Z
authors.lastname: He
authors.forename: Changming
authors.initials: C
authors.lastname: Zhou
authors.forename: Guoliang
authors.initials: G
authors.lastname: Li
authors.forename: Xiancai
authors.initials: X
authors.lastname: Deng
mesh_terms: D000818:Animals; D002645:Chickens / Q000254:growth & development / Q000378:metabolism*; D031202:Chrysanthemum / Q000737:chemistry / Q000254:growth & development*; D005308:Fertilizers / Q000032:analysis*; D020387:Food Chain; D008372:Manure / Q000032:analysis*; D010758:Phosphorus / Q000032:analysis*; D012406:Roxarsone / Q000032:analysis* / Q000378:metabolism; D012989:Soil Pollutants / Q000032:analysis*
chemical_list: D005308:Fertilizers; D008372:Manure; D012989:Soil Pollutants; D010758:Phosphorus; D012406:Roxarsone