崂山区茶园土壤重金属含量与安全质量评价

Contents and Quality Safety Assessment of Heavy Metals in Tea Garden Soil of Laoshan Region

对崂山区72个茶园土壤Cd、Pb、As、Hg、Cu、Cr含量分析及安全质量评价结果表明,6种重金属元素的平均值均低于NY5199-2002有机茶产地环境条件限定值,但各元素测定值变异系数差异很大。6种重金属元素中,Cd的Newm erow污染指数最高,属于无公害标准的轻污染级,有机标准的中度污染级;As污染指数最低,达到有机标准的安全级;其余5种元素按无公害标准要求属于安全级,但按有机标准则为控制或轻污染级。

The content investigation of Cd,Pb,As,Hg,Cu,Cr and their quality safety assessment of 72 soil samples from Laoshan tea gardens showed that the average content of each heavy metal was under the limit value of environmental condition frxed in the Agricultural Sector Standard NY5199 -2002, but the CV values were markedly different between different metals. The Newmerow pollution index of Cd was the highest and that of As was the lowest among the 6 metals, and the former was the light - polluted level based on pollution - free standard and the medium - polluted level based on the organic standard. The latter was the safe level based on the organic standard. The contents of Pb,Hg,Cu and Cr were in safe levels of non pollution and in controlled and light- pollution levels of organic standard.