云南南华茶产区中铜、铁、锰和锌的含量分布特征

Content Distribution Characteristics of Cu,Fe,Mn and Zn in Tea Production Area in Yunnan Nanhua County

采用ICP-MS法对南华县28个茶园土壤、茶叶和茶汤中的Cu、Fe、Mn和Zn的含量进行测定,并对各元素在土壤和茶叶之间及茶叶和茶汤之间的相关性进行分析.结果表明,Cu、Fe、Mn和Zn的含量在土壤中分别在6.28~52.72 mg/kg、12834~34098 mg/kg、41.1~3057.0 mg/g和18.39~706.90 mg/kg之间,在茶叶中分别在3.67~14.14 mg/kg、12.16~282.40 mg/kg、151.2~2472.0 mg/kg和4.96~285.50 mg/kg之间;茶叶中Cu、Fe、Mn和Zn的溶出率分别在4.86%~52.32%、5.86%~38.34%、1.50%~18.92%和0.72%~39.27%之间.相关性分析结果显示,茶叶中Cu含量与Cu的溶出率呈极显著负相关,与Zn的溶出率呈极显著正相关;茶叶中Fe含量与Fe的溶出率呈极显著负相关;茶叶中Zn含量与Mn的溶出率呈显著正相关,与Zn的溶出率呈极显著负相关.

The contents of Cu,Fe,Mn and Zn in soil,tea and tea soup from 28 tea gardens in Nanhua County were measured by ICP-MS,and their content correlations between soil and tea,tea and tea soup were analyzed.The results showed that the contents of Cu,Fe,Mn and Zn in soil are as follows:6.28—52.72 mg/kg,12834—34098 mg/kg,41.1—3057.0 mg/kg and 18.39—706.90 mg/kg;the content of them in tea are as follows:3.67—14.14 mg/kg,12.16—282.40 mg/kg,151.2—2472.0 mg/kg and 4.96—285.50 mg/kg.Dissolution rates of Cu,Fe,Mn and Zn are 4.86%—52.32%,5.86%—38.34%,1.50%—18.92%and 0.72%—39.27%.In tea,the content of Cu has an obviously negative correlation with its dissolution rate and an obviously positive correlation with the dissolution rate of Zn.The content of Fe has an obviously negative correlation with its dissolution rate;the content of Zn has an obviously positive correlation with the dissolution rate of Mn,and an obviously negative correlation with its dissolution rate.