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目的了解乌鲁木齐地区市售绿茶中稀土元素的含量,以及绿茶中稀土元素含量分布。方法采集62份乌鲁木齐地区市售绿茶,依据《2014年国家食品污染和有害因素风险监测工作手册》中,动植物性食品中稀土元素电感耦合离子体质谱法测定的标准操作程序进行检测。结果以稀土氧化物总量计,62份绿茶样品稀土元素总残留量0.001 99~9.120 00 mg/kg,平均含量(1.120 11±0.203 36)mg/kg,其中80.64%(50/62)样品含量在0.100 00~2.000 00 mg/kg之间,6份样品超出《食品中污染物限量》中规定的茶叶中稀土元素限量标准,合格率90.32%(56/62)。结论乌鲁木齐地区市售绿茶受稀土元素污染的风险不大,但仍需加强定期监测。
Objective To understand the contents of rare earth elements in commercially available green tea in Urumqi and the distribution of rare earth elements in green tea. Methods Sixty-two commercial green tea in Urumqi were collected and tested according to the standard operating procedure of rare earth element inductively coupled plasma mass spectrometry (ICP-MS) in animal and plant foods in the 2014 Handbook for Risk Assessment of Food Contamination and Hazardous Factors. Results The total residual rare earth elements in 62 green tea samples were 0.001 99 ~ 9.120 00 mg / kg and average contents (1.120 11 ± 0.203 36) mg / kg, of which 80.64% (50/62) Between 0.100 00 and 2.000 00 mg / kg, 6 samples exceeded the limit of rare earth elements in tea as stipulated in the “Limit of Contaminants in Food”, with a pass rate of 90.32% (56/62). Conclusion There is little risk of rare earth elements contaminated by commercial green tea in Urumqi, but regular monitoring is still needed.