Department of Soil Science, Luiz de Queiroz School of Agriculture, University of São Paulo (ESALQ-USP), C.P. 9, Piracicaba, 13418-900, SP, Brazil,
Environ Sci Pollut Res Int. 2013 Oct;20(10):7231-42. doi: 10.1007/s11356-013-1723-9. Epub 2013 Apr 27.
The solid-solution distribution or partition coefficient (Kd) is a measure of affinity of potentially toxic elements (PTE) for soil colloids. Kd plays a key role in several models for defining PTE guideline values in soils and for assessing environmental risks, and its value depends on edaphic and climatic conditions of the sites where the soils occur. This study quantified Kd values for Cd, Co, Cr, Cu, Hg, Ni, Pb, and Zn from representative soil samples from Brazil's eastern Amazon region, which measures 1.2 million km(2). The Kd values obtained were lower than those set by both international and Brazilian environmental agencies and were correlated with the pH, Fe and Mn oxide content, and cationic exchange capacity of the soils. The following order of decreasing affinity was observed: Pb>Cu>Hg>Cr>Cd≈Co>Ni>Zn.
固溶体分布或分配系数(Kd)是衡量潜在有毒元素(PTE)与土壤胶体亲和力的指标。Kd 在定义土壤中 PTE 指导值和评估环境风险的几个模型中起着关键作用,其值取决于土壤所在地点的土壤和气候条件。本研究量化了来自巴西东部亚马逊地区的代表性土壤样品中 Cd、Co、Cr、Cu、Hg、Ni、Pb 和 Zn 的 Kd 值,该地区面积为 120 万平方千米。获得的 Kd 值低于国际和巴西环境机构设定的值,并与土壤的 pH 值、Fe 和 Mn 氧化物含量以及阳离子交换能力相关。观察到的亲和力递减顺序为:Pb>Cu>Hg>Cr>Cd≈Co>Ni>Zn。