冀东沿海地区镉的富集程度及成因分析

河北省地质调查院在冀东沿海地区的浅层土壤中发现了450 km2的镉富集带,富集区内Cd含量平均值0.76 mg/kg,最大值7.65 mg/kg,镉富集区域与当地的水稻田范围极为吻合。本文根据深、浅层土壤地球化学调查结果,运用富集因子及多元统计分析方法论述了镉的空间富集程度及富集的成因。结果表明,镉在研究区浅层土壤中高度富集,富集因子平均值3.27,最大值23.3。镉含量地球化学图、富集因子等值线图、污染因子得分图的空间分布特征几乎一致,异常区域内存在污染元素镉的单因子,镉富集源于人为活动。

RESEARCH ON THE ENRICHMENT AND ORIGIN OF CADMIUM IN SOILS IN A COASTAL AREA OF EAST HEBEI PROVINCE

A cadmium-enriched area covering an area of 450km2 with the average content of Cd of 0.76mg/kg and the maximum value of 7.65mg/kg in top soils,which is located in a coastal area of East Hebei Province,was investigated by Institution of Geological Survey of Hebei Province.The Cd-enriched area is as large as the area of rice planting.On the basis of the results of geochemical survey for top and deep soils,this study deals with the enrichment and origin of soil cadmium by using the techniques of enrichment factor and multi-analysis.The results indicated that cadmium was enriched remarkably in top soils of the study region,with the average enrichment factor(EF) of Cd being 3.27 and the maximum value being 23.3.The plots of Cd geochemistry map,EF isoline and pollution factor score are almost consistent.There exists the sole pollution factor of Cd in the abnormity region and cadmium enrichment is considered to have resulted from anthropogenic activities.