河北平原土壤中汞的地球化学分布特征

摘要

Based on the data obtained by multi-purpose regional geochemical survey, the authors studied the spatial distribution of Hg in soils of Hebei plain, and drew the geochemical diagram of topsoil and deep soil. The result shows that the mean content of Hg in top⁃soil is 43.77×10-9, and that in deep soil is 17.58×10-9. The main chemical speciation of Hg in root soil is inert mercury, and the pro⁃portion of active mercury is only 3.24%. These data suggest that the degree of soil environmental safety is high. The Hg content in top⁃soil is higher in the west part of Hebei plain than in the east part. There is a significantly high value area distributed along the Taihang Mountain, which is formed by natural factors. The distribution of Hg low value area is similar to the distribution of rivers. Punctuated high value areas surrounding cities and towns are formed by human activities.%基于多目标地球化学数据，研究了河北平原土壤内Hg的空间分布特征，制作了表层土壤和深层土壤Hg的分布图。结果显示：河北平原Hg含量均值在表层土壤为43．77×10－9，深层土壤为17．58×10－9；根系土Hg的形态以惰性态为主，有效态比例仅为3．24％，土壤环境安全性较高。 Hg含量在河北平原表层土壤中呈现出西高东低的趋势，明显表现为因自然原因形成的沿太行山麓平原的显著高值区；低值区有沿河道相分布的特点；城市周边因人为原因形成点状高值区。