马连道茶城市售茶叶卫生质量检测及分析

Determination and Analysis on Sanitation Quality of Tea in Maliandao Market

目的了解马连道茶城市售茶叶的卫生质量。方法按照国家标准方法对样品进行前处理,采用石墨炉原子吸收光谱法检测铅;利用气相色谱法测定有机氯农药;液相色谱法测定咖啡碱;分光光度法测定茶多酚及游离氨基酸;按卫生统计学方法对数据进行处理。结果所检茶叶样品中铅0.29～0.59 mg/kg、有机氯农药残留量为0.008～0.104 mg/kg,均低于国家标准,茶多酚、咖啡碱、游离氨基酸含量与国内报道基本一致。结论马连道茶城市售茶叶质量较好,铅及有机氯农药残留量低。

Objective To collect 65 samples tea in Maliandao market,determine the content of lead,organochlorine pesticide residues,tea polyphenol,caffeine and dissociate amino acid in tea,and investigate the situation of sanitation quality.Methods After pre-treatment based on national standard method,lead content in tea were determined by GFAAS,organochlorine pesticide residues were determined by GC,caffeine were determined by HPLC,tea polyphenol and dissociate amino acid were determined by the means of standards curve with spectrophotometry.Results The residual quantity of lead and organochlorine pesticide residues in these samples were less than national standards,the level of tea polyphenol,caffeine and dissociate amino acid were in accordance with the results reported in China.Conclusion The quality of tea in Maliandao market is safety,the residual quantity of lead and organochlorine pesticide residues is low level.