广州市黄埔港区土壤中汞的形态分析及分布特征

采用化学浸提技术对广州市黄埔港区土壤中的汞进行形态分析,通过实验确定了可交换态汞(包括水溶性汞)、盐酸溶汞、元素汞、腐殖酸结合态汞、有机质结合态汞、硫化汞、残渣态汞的浸提条件,探讨了各种形态汞在表层及总量在垂直方向上的分布特征。分析结果表明,广州市黄埔港区土壤中汞以比较稳定的形态存在,活动态约占6%。总汞含量随深度增加而降低,总汞在垂直方向中的含量差异在一定程度上反映出汞受人为污染的影响情况。

Speciation Analysis of Mercury and Their Distribution Characters in Soil from Huangpu Port

Surface and vertical drilling samples were collected in Huangpu Port. A sequential extraction method was studied and applied for the extraction of mercury species from the samples. The distribution characters of various mercury species in the surface samples and the change of the contents of total mercury in the surface and vertical drilling samples were discussed. The results showed that stable species of mercury was the major species in the surface soil samples of Huangpu Port, accounted for about 94% of the total mercury, and active species of mercury was only a minor part, accounted for about 6% of the total mercury , and the contents of total mercury had a negative correlation with sampling depth. The difference of the content of total mercury in the soil samples at different depth in Huangpu Port showed that Huangpu Port soil has been affected by the pollution from human activities.