六安瓜片茶区土壤和茶叶铅和铜含量的调查

Effect of Soil Quality on Lead and Copper Contents in the Tea

目的采集六安瓜片茶主产区的土壤及茶叶样本进行铅、铜的检测,以便为寻找茶叶铅、铜污染来源及有效控制茶叶重金属铅、铜的污染提供参考。方法于2007年3月26日—4月24日,分别从六安瓜片主产区的10个茶园采集土壤和茶叶样本,土壤样本经消化处理,茶叶样本经灰化处理后用混合酸溶解,参照国标方法,用火焰原子吸收法(FAA),测定各样本中的铅和铜的含量。结果所有茶叶样本中的铅、铜含量均低于GB2762—2005《食品中污染物限量》的标准限值。在所测茶叶样本中铅的含量与土壤样本中铅含量呈统计学正相关(r铅=0.6502,P<0.05),而茶叶中铜含量与土壤中铜含量呈负相关(r铜=-0.6344,P<0.05)。结论土壤铅影响茶叶中铅的含量,而茶叶中铜含量与土壤的关系有待进一步研究。

Objective In order to find the pollution source and provide some useful references for the controlling of the heavy metal pollution to the tea. Methods From March to April,2007,the soil and tea samples were collected from 10 tea gardens in the main producing areas. The soil samples were digested. The tea samples were dissolved by mix acid solution after being burnt into ashes,then the contents of lead and copper were determined by FAAS. Results There was a significant positive correlation between tea and soil in the lead contents （r lead=0.650 2,P〈0.05）,but a negative correlation between tea and soil in the copper content. Conclusion The level of lead in the soil will influence the level of lead in tea and the relationship between soil copper content and tea copper content needs to be further studied.