黔东南州太子参种植土壤中重金属含量及污染评价

Heavy Metal Contents of the Soils for Planting Radix Pseudostellariae and Its Pollution Evaluation in Qiandongnan Prefecture

为了研究黔东南州太子参种植土壤中重金属含量及污染情况,按国家相关标准方法检测土壤中铅（Pb）、镉（Cd）、汞（Hg）3种重金属及类金属砷（As）的含量,以《土壤环境质量标准》（GB/T 15618-1995）作为评价标准,对其单项污染指数和综合污染指数进行分析评价。结果表明,黔东南州太子参种植区域土壤重金属及类金属含量差异较大,镉为0.02-0.84 mg/kg,铅8.4-70.7 mg/kg,汞0.02-0.78 mg/kg,砷1.01-44.6 mg/kg。在重金属污染因子中,Cd是主要污染因子,其次是Hg和As。但黔东南州的大部分土壤适宜于种植太子参。

The Pb,Cd,Hg and As content of the soil for planting Radix Pseudostellariae was determined by relevant national standard methods,and single pollution and comprehensive indexes were evaluated according to ＂Soil Environmental Quality Standard＂（GB/T 15618-1995）.The results showed that there was obvious difference in heavy metals content between different planting areas of Radix Pseudostellariae in Qiandongnan prefecture,the content of Cd,Pb,Hg and As was 0.02～0.84mg/kg,8.4～70.7mg/kg,0.02～0.78mg/kg and 1.01～44.6mg/kg respectively.Cd is the main pollution factor in heavy metal pollution,followed by Hg and As.The most soil is suitable to planting Radix Pseudostellariae in Qiandongnan prefecture.