Hartley William, Dickinson Nicholas M, Clemente Rafael, French Christopher, Piearce Trevor G, Sparke Shaun, Lepp Nicholas W
School of Biological and Earth Sciences, Liverpool John Moores University, Byrom Street, Liverpool L3 3AF, UK.
Environ Pollut. 2009 Mar;157(3):847-56. doi: 10.1016/j.envpol.2008.11.017. Epub 2008 Dec 31.
A 6.6 ha grassland, established on a former chemical waste site adjacent to a residential area, contains arsenic (As) in surface soil at concentrations 200 times higher than UK Soil Guideline Values. The site is not recognized as statutory contaminated land, partly on the assumption that mobility of the metalloid presents a negligible threat to human health, groundwater and ecological receptors. Evidence for this is evaluated, based on studies of the effect of organic (green waste compost) and inorganic (iron oxides, lime and phosphate) amendments on As fractionation, mobility, plant uptake and earthworm communities. Arsenic mobility in soil was low but significantly related to dissolved organic matter and phosphate, with immobilization associated with iron oxides. Plant uptake was low and there was little apparent impact on earthworms. The existing vegetation cover reduces re-entrainment of dust-blown particulates and pathways of As exposure via this route. Minimizing risks to receptors requires avoidance of soil exposure, and no compost or phosphate application.
一片6.6公顷的草地位于一个居民区附近的 former chemical waste site 上，其表层土壤中的砷（As）含量比英国土壤指导值高出200倍。该场地未被认定为法定污染土地，部分原因是基于这样一种假设，即这种类金属的迁移性对人类健康、地下水和生态受体构成的威胁可忽略不计。基于对有机（绿色垃圾堆肥）和无机（氧化铁、石灰和磷酸盐）改良剂对砷的形态、迁移性、植物吸收和蚯蚓群落影响的研究，对这一假设的证据进行了评估。土壤中砷的迁移性较低，但与溶解有机物和磷酸盐显著相关，而固定化与氧化铁有关。植物对砷的吸收较低，对蚯蚓几乎没有明显影响。现有的植被覆盖减少了扬尘颗粒物的再夹带以及通过这条途径的砷暴露途径。将对受体的风险降至最低需要避免土壤暴露，并且不施用堆肥或磷酸盐。
