贵阳市近郊菜地土壤中汞分布特征研究

Research on mercury distribution characteristics of soils of suburb vegetable fields in Guiyang city

为了解贵阳市近郊菜地土壤中汞分布特征,对贵阳市近郊菜地土壤进行调查,共采集了贵阳市近郊12个乡镇蔬菜基地的77个土壤样本,测定了土壤中汞的含量,并运用地质累计指数方法对土壤中汞的污染程度进行了评价。结果表明,贵阳市近郊菜地所有采样点的土壤中汞含量绝大部分超过背景值。有44个样本的地质累积指数在1~2,有5个样本的地质累积指数大于2,贵阳市近郊菜地土壤受汞的污染程度总体来说是中度污染,而在石板镇、青岩镇和牛场乡等地方出现了中度污染向强污染变化的情况。

A survey was conducted to detect the mercury distribution characteristics of soils of vegetable fields in the suburb of Guiyang city. 77 soil samples from 12 vegetable bases in 12 townships of Guiyang suburb were collected,and the content of mercury in the samples were determined. By adopting the geoaccumulation index method,the pollution indices were calculated to assess the mercury pollution extent.The results showed that the mercury content of most soil samples taken from the 12 suburb vegetable sampling sites was higher than the background value. The geological accumulation indexes of 44 samples ranged from 1 to 2,and that of five was higher than 2. Generally,the mercury pollution of soils of suburb vegetable fields is moderate in Guiyang,while there emerged tendencies of deterioration from moderate pollution to strong pollution in Shiban town,Qingyan town,and Niuchang township.