Detection and Evaluation of Metals in Tea and Soils of Tea Gardens in Mingshan

[Objective]The study aimed to detect and assess metal ions in tea and soil of tea gardens in Mingshan County. [Method]Seven metals ( including Pb,Cr,Cu,Ca,Mn,Mg and Zn) in soil and tea samples of tea gardens in Mingshan were determined by atomic absorption spectrometry,and the pollution situation of the soil and tea by Pb,Cr and Cu were evaluated using the single factor pollution index and Nemerow pollution index,finally the accumulation of heavy metals in different soils were analyzed by the enrichment factor. [Result] There was little difference for the same heavy metals in various soils,but different heavy metals had very significant difference. The enrichment factors of metals needed by tea growing,such as Ca,Mn,Mg and Zn,were higher than heavy metals like Pb and Cr. In addition,soils and tea of the six tea gardens were not polluted by Pb,Cr and Cu,and both single factor pollution index and Nemerow pollution index were below 0.7. [Conclusion] The research could provide scientific references for preventing tea from being polluted by heavy metals.