市售几种茶叶及其汤汁中咖啡因和铅、铜的检测

Detection of contents of caffeine,lead and copper in several types of tea and their soup sold in Lu'an Market

目的：对收集到的六安市售的十个茶叶品种样品，分别进行咖啡因、铅和铜含量的检测，以了解其质量状况。方法：1g茶叶＋100ml100℃纯净水浸泡20min所得茶汤中咖啡因的含量，采用HPLC法检测；利用FAA法检测铅、铜的含量。结果：被检茶样中铅含量在2．5952-4．6785mg／kg之间、铜含量在7．3784～25．7182mg／kg之间；茶汤中铅、铜溶出量均未检出；一泡茶汤中咖啡因含量在66．226～278．880mg／L之间。结论：十个茶叶样品中铅铜含量均未超标，其一泡茶汤中咖啡因含量符合国标限量。

Objective：To investigate the qualitative condition of tea which were sold in Lu＇an market, ten varieties of tea were collected, the contents of caffeine, lead and copper were detected. Methods：The content of caffeine were detected by the means of standard curve with HPLC. And contents of lead and copper were detected by the means of standard curve with FAA. Results： The contents of lead in these samples were extent from 2. 5952 to 4. 6785 mg/kg, and copper in these samples were range of 7. 3784 - 25.7182 mg/kg. There was no lead or copper being detected in the soup. The content of caffeine in the soup was extent from 66. 226 to 278. 880 mg/L, which 1 g tea samples were solved for 20 min by 100℃ purified water. Conclusion：The content of caffeine in these tea soup and the contents of lead and copper had not exceeded the standard in these samples.