会理污灌区重金属污染的调查、评价及防治对策

Investigation,Assessment and Control Countermeasures on Heavy Metal Pollution of Sewage lrrigation in Huili County,Sichuan Province

本文调查、评价了会理县锌矿污灌区内水、土、作物的重金属污染状况。调查结果表明：污灌区内土壤、作物重金属污染严重，尤以镉污染突出。作物中镉含量与距污染源距离呈负相关（ｒ＝－０．９９５）。镉在水稻植株各部位的分布，以根系含镉量最高，茎叶次之，谷粒最少。评价结果表明农灌水的污染程度不大，土壤中Ｃｄ、Ｚｎ、Ｐｂ污染是土壤污染的主要表现，水稻的污染较玉米更为严重。Ｃｄ已对人体健康构成潜在危害。

Heavy metal pollution in water,soil and crops irrigated by sewage in Huili County,Sichuan was investigated in this paper.Results show that the heavy metal pollution,such as cadmium,zinc and lead,was slight in river but serious in soil.Cadmium pollution which was more serious in rice than that in corn was outstanding,especially in soil and crops.It has been threatening human health.The contents of cadmium in crops were negatively related with the distance to the pollution source(r=-0.995).The distribution of cadmium in rice was root> stem,leaf>grain.This paper also suggests some control countermeasures in order to prevent the heavy metal pollution in this area.