贵州省万山汞矿区周围土壤中不同形态汞的空间分布特征

The Spatial Distribution Characteristics of Mercury Specification in Soil of Wanshan Mercury Mining Area Guizhou Province,China

利用连续提取法对贵州省万山汞矿区周边土壤的形态与分布特征进行了测试分析。结果表明,研究区土壤中汞含量在1.34～291.71mg·kg-1之间,明显高于我国土壤汞背景值。表层土壤中汞含量在东部区域普遍较高,西部区域相对较低,并呈现随距污染源距离的增加逐渐降低的趋势。剖面土壤中的汞则表现出明显的表层富集规律。研究区土壤中汞的形态主要以残渣态、难氧化降解有机质及某些硫化物结合态和易氧化降解有机质结合态汞为主,且不同形态的汞含量与总汞含量具有较大的相关性。

The Hg speciation in soil was analyzed using sequential extraction method to study its spatial distributions in Wanshan mecury mining area in Guizhou, China. It was found that the content of Hg in the soil of the study area ranged 1.34-291.71 mgkg-1, which was higher than the soil background values in China. The content of Hg in the topsoil was higher in the east part of the study area in the west part, and decreased with mainly enriched in the topsoil as the forms of residue, non-biodegradable organic matter, sulfide and biodegradable organic matter. The content of each st）eciation had significant correlation with the total Hg in the soils.