摘要
目的探讨乌龙茶叶及茶汤中菊酯类农药和重金属的残留情况。方法于2004年采集3个茶叶生产基地的5种春季乌龙茶样品,进行常规的泡茶,测定干茶叶中的氯氰菊酯和氰戊菊酯农药以及Cu、Zn、As、Cd、Pb等重金属残留情况。干茶叶和茶汤中的菊酯类农药分别采用超声波萃取和振荡萃取,浓缩净化后用气相色谱-电子捕获检测器测定,干茶叶及茶汤分别经消解,用电感耦合等离子体-质谱及原子荧光光度法检测其中的重金属含量。结果干茶叶样品中氯氰菊酯和氰戊菊酯的含量分别为0.200～0.585和0.335～0.780mg/kg,而其相应的茶汤样品中这2种菊酯类农药均未检出。各个干茶叶样品中均未检出Hg。故未做茶汤样品中Hg的残留分析,茶汤样品中Cu、Zn、As、Cd、Pb的含量分别为0.440～1.663μg/ml,1.590～3.509μg/ml,未检出～0.389μg/ml,未检出～14.220ng/ml,0.759～1.462μg/ml。结论菊酯类农药残留不会因冲泡茶叶进入茶汤,冲泡过程能溶出茶叶中部分重金属,但其含量基本在国家标准范围内。
Objective To analyze the residues of chrysanthemum ester pesticides and heavy metals in several typical Oolong tea samples for evaluating the drink safety. Methods The residues of chrysanthemum ester pesticides in the tea samples were extracted with ultrasonic method. Gas chromatography equipped with ECD was applied to determine the pesticide residues. The heavy metals in tea samples were analyzed with an inductively coupled plasma-mass spectrometer （ICP-Mass） and an atomic fluorescence spectrometer. Results The residues of chrysanthemum ester pesticides in the dry tea samples were 0.200-0.780 mg/kg, no residues was detected in the tea water. The content of heavy metals in the dry tea and tea water was very low, under the standard limits. Conclusion The Oolong tea samples chosen in the present investigation have not been polluted by chrysanthemum ester pesticides and heavy metals, according to the results, the Oolong tea made in the area is safe for drink.
出处
《环境与健康杂志》
CAS
CSCD
北大核心
2006年第2期160-162,共3页
Journal of Environment and Health
基金
厦门大学"凌峰科研奖励计划"基金资助
关键词
茶
农药
金属
重
Tea
Pesticides
Metals, heavy
