永川区近郊蔬菜地土壤重金属污染调查与评价

Survey and evaluation on heavy metal contamination of vegetable soil in suburbs of Yongchuan

为了解蔬菜地土壤中重金属污染程度,选取重庆市永川区21个乡镇蔬菜地的43份土壤样品作为材料,采用原子吸收分光光度法对土壤中的Cu2+、Zn2+、Pb2+、Cd2+4种重金属含量进行测定。结果表明,从单项污染指数来看,只有Cd2+处于安全级;Pb2+除了仙龙地区处于安全级外均处于警戒级或者轻污染级;而Cu2+和Zn2+大部分处于安全级。从综合污染指数来看,除了仙龙和金龙两个地区处于安全级外,其他都处于警戒级和轻污染级。

To further understand the pollution degree of heavy metal in vegetable soil, 43 vegetable soil samples from 21 villages and towns in Yongchuan were collected as material. Concentration of Cu2., Zn2＋, Pb2＋, Cd2＋ in the soil were determined by using atomic absorption spectrophotometry. The results showed that, judged by the means of single pollution index, only Cd2＋ was all in the security class; except in Xianlong area at the safety level, Pb2＋ in other areas was all in the alert level or light pollution level; and Cu2＋ and Zn2＋ most were in the safety level. Judged by the means of comprehensive pollution index, only Xianlong and Jinlong area were in safety level, other areas were all in the alert level or light pollution level.