茶园土壤和茶叶中重金属的监测与污染评价

测定了西南地区主要茶园土壤和茶叶中的重金属Pb,Cr,Cu,Cd,Hg和As含量,结合茶园土壤和茶叶的卫生质量标准,采用单因子污染指数法和Nemerow污染指数法进行污染评价。结果表明:西南地区茶叶和茶园土壤中6种重金属的含量都在相应的质量标准范围内,单因子污染指数和Nemerow污染指数均<1.0。但乐山和川茶群体土壤中的Cd综合污染指数达到0.69,接近安全等级的上限0.70。总体看来茶叶和茶园土壤未受这6种重金属元素的污染,茶叶和茶园土壤环境质量总体良好。缙云山茶和银芽中Cd和Hg是高富集元素,川茶群体中Hg是高富集元素。

Monitoring and Evaluation of Heavy Metals in Soil of Tea Gardens and Teas

Amounts of heavy metals such as Pb, Cr, Cu, Cd, Hg and As in teas and soil of main tea gardens in southwest area were determined. Combined with health quality standard of soil in tea garden and tea, pollution of heavy metals was evaluated using single factor pollution index and Nemerow pollution index. Results showed that the contents of heavy metals were in the scope of corresponding quality standard, but Nemerow pollution index of Leshan soil was a litter high. Qualities of teas and soil environment of tea gardens were quite good on the whole. Cd and Hg were heavily enriched in Jinyunshan tea and Yinya tea, while Hg was heavily enriched in Chuancha group.