浙中某县Cd元素地球化学特征及生态效应

本文基于对浙中某县土壤-作物系统的调查研究,系统总结了Cd元素地球化学特征。研究发现,土壤中Cd含量呈现表层富集趋势;土壤Cd元素的赋存形态以离子交换态为主,占各形态总量比例高达39.68%,显示出该地区土壤中Cd的活性相对较强;Cd污染区在南部山区沿水系分布,在研究区北部零星分布。研究同时发现,污染主要是由于矿山开采、工业废物排放以及污水灌溉等人类活动引起,并且污染区已出现稻米样品Cd超标,应引起有关部门足够重视。

Geochemical Characteristics of Element Cd and Its Ecological Effect from a County, Central Zhejiang

Based on investigations into the soil-crop system of a county, central Zhejiang Province, the element geochemical characteristics of Cd were summarized. Results showed that Cd in soil showed a trend of surface enrichment. Cd speciation in soil was mainly in ion exchange form (39.68%), which showed that Cd had a strong activity in this region. Cd-contaminated areas in the southern mountains were distributed along the river, while in the northern area Cd was of fragmentary distribution. The study also found that Cd pollution was mainly caused by human activities such as mining, industrial waste and sewage irrigation. Also, the Cd content of rice grain samples in the contaminated areas exceeded the national control standard, which should cause the adequate attention of the relevant departments.