株洲市白马乡土壤和农作物重金属污染评价

EVALUATION OF HEAVY METAL POLLUTION OF SOIL AND CROPS IN BAIMA VILLAGE ZHUZHOU CITY

本文对株洲市白马乡土壤及其农作物中重金属含量进行了调查并对其污染进行了评价。结果表明:该乡土壤和作物均受到了不同程度的重金属污染,土壤达不到土壤环境质量二级标准要求,作物达不到食品卫生标准要求,土壤重金属污染因子主要为Cd,作物中主要重金属污染因子为Cd、Pb。附近清水塘工业区排放的大气污染物重金属尘是造成白马乡土壤和作物重金属污染的主要因素。不同测点土壤和作物污染程度差别极大,主要和各测点与最大重金属尘污染源距离的远近、方位及风向有关。

Content of heavy metals in the soil and crops are analyzed and their pollutions are evaluated. The results indicate that the soil and crops in this village are polluted by heavy metals to a varying extent. The soil fails to meet Grade II standard for soil environmental quality and the crops fall short of the hygienic standard for food. The main polluting factor of the soil is Cd, and of the crops are Cd and Pb. Heavy metal-containing dust from Qingshuitang Industry Zone in the neighhorhood is the most important factor that causes the soil and crops polluted in Baima Village. The pollution level of the soil and crops varies from one monitoring spot to another, which is mainly related to variation of the distance and azimuth of the monitoring spots from the pollution source and direction and strength of the wind.