乐山市茶园土壤及茶叶重金属调查与分析

Investigation and Analysis of Heavy Metals in Soil of Tea Plantations and Tea at Leshan

采用原子荧光分光光度法测定As、Hg含量,原子吸收分光光度法测定重金属Cu、Cr、Cd、Pb含量。以《土壤环境质量标准GB15618—1995》为依据,采用单因子污染指数和综合污染指数对茶园土壤样品进行评价。结果表明,采样点土壤中As、Hg、Cu、Cr、Cd、Pb平均含量除Cd超标20%~40%外,其余5种均未超过国家二级土壤重金属标准限值。重金属As、Hg、Cu、Cr、Pb的单项污染指数均小于1.0,属于安全级别。以NY659-2003、NY/T288-2012为依据,则46个茶园茶叶原料样品中的As、Hg、Cu、Cr、Cd含量均远低于国标或部颁的最高含量限值。

The content of As,Hg,Cu,Cr,Cd and Pb were detemfined by atonfic fluorescence spectrometry and atonfic absorption spectrophotometry. Based on ＂GB15618-1995＂ of ＂soil environmental quality standard＂ , the single factor pollution index and comprehensive pollution index were used to evaluate the soil samples in tea plantation. The results showed that the average content of As,Hg,Cu,Cr, Cd,Pb in addition to Cd exceeding the limit of 20%-40%,the other 5 minutes did not exceed the linfit of national level 2 soil heavy metal standard, and the single pollution index of As,Hg,Cu,Cr,Pb were less than 1.0,it belongs to the level of security. Based on NY659-2003,NY/T288-2012,the content of As,Hg,Cu,Cr,Cd,Pb of tea samples of raw materialswere obtained in the five sampling point. The contents of 46 samples were much lower than the national standard or issued by the Department of the highest content limit.