Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture, Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation, Guangzhou 510640, PR China.
Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture, Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation, Guangzhou 510640, PR China.
J Hazard Mater. 2013 Jun 15;254-255:270-276. doi: 10.1016/j.jhazmat.2013.03.048. Epub 2013 Mar 26.
Roxarsone (ROX), a widely used feed organoarsenic additive, is excreted as itself and its metabolites in animal manure. Animal manure is commonly applied with N fertilizer to meet the N demand of crop. We investigated the accumulation of As species in garland chrysanthemum plants fertilized with chicken manure (CM) bearing ROX and its metabolites, combined with different inorganic N sources (NH₄(+), NO₃(-) and urea), respectively. The change of pH, N forms and As species in soils was examined as well. The results show that As(V), As(III) and dimethylarsinic acid (DMA) were detectable in soils, and conversions between As species were affected by three inorganic N sources, irrespective of N form and soil pH. As(III) was the sole As species in garland chrysanthemum shoots, and As(III) and As(V) could be detected in roots. Urea, superior to NH₄(+), significantly enhanced the uptake of As species in plants by promoting plant growth, while NO₃(-) slightly reduced the As accumulation due to decreased biomass. As(III) was the dominant As compound (86.9-89.7%) in plants. Therefore, inorganic N fertilizers may inadvertently increase the risk of As contamination in plant from ROX via the way ROX→chicken→CM→soil→crop.
罗欧砷（ROX）是一种广泛使用的饲料有机砷添加剂，会以自身及其代谢物的形式从动物粪便中排出。动物粪便通常与氮肥一起施用于满足作物的氮需求。我们研究了在施有含有 ROX 及其代谢物的鸡粪（CM）的情况下，不同无机氮源（NH₄(+)、NO₃(-)和尿素）对花环菊花植株中砷形态的积累情况。同时还检查了土壤中 pH 值、氮形态和砷形态的变化。结果表明，土壤中可检测到 As(V)、As(III)和二甲基砷酸（DMA），并且三种无机氮源都会影响砷形态之间的转化，而与氮形态和土壤 pH 值无关。As(III)是花环菊花茎中的唯一砷形态，而根中可检测到 As(III)和 As(V)。与 NH₄(+)相比，尿素显著通过促进植物生长而增加了植物对砷形态的吸收，而 NO₃(-)由于生物量减少而略微降低了砷的积累。As(III)是植物中主要的砷化合物（86.9-89.7%）。因此，无机氮肥可能会通过 ROX→鸡→CM→土壤→作物的途径，无意中增加了植物中 ROX 带来的砷污染风险。
