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目的了解乌鲁木齐地区市售奶粉中稀土元素的含量,分析稀土元素含量分布。方法采集乌鲁木齐地区市售奶粉178份,依据《2015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 178份奶粉中,16种稀土元素均有检出,总残留量(以稀土氧化物总量计,下同)0.000 00~2.089 11 mg/kg,平均含量(0.097 51±0.211 19)mg/kg,检出率96.63%(172/178);其中152份婴幼儿奶粉稀土元素平均含量(0.098 96±0.227 55)mg/kg,检出率为96.05%(146/152),其他类型奶粉稀土元素平均含量(0.089 35±0.068 42)mg/kg,检出率100.00%(26/26)。结论本次调查的乌鲁木齐地区市售奶粉中有一定的稀土元素残留量,虽含量不高,但检出率较高,因此仍需持续监测奶粉中稀土元素的含量,以保障人们的饮奶安全。
Objective To understand the contents of rare earth elements in milk powder commercially available in Urumqi and analyze the distribution of rare earth elements content. Methods 178 samples of milk powder 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 “2015 Handbook for Risk Assessment of Food Contamination and Hazardous Factors”. Results Of the 178 milk powder samples, all the 16 rare earth elements were detected. The total residues (as rare earth oxides, the same below) 0.000 00 ~ 2.089 11 mg / kg, the average content (0.097 51 ± 0.211 19) mg / kg, the detection rate was 96.63% (172/178). Among them, the average content of rare earth elements in 152 infant formula was (0.098 96 ± 0.227 55) mg / kg, the detection rate was 96.05% (146/152) The average content of elements (0.089 35 ± 0.068 42) mg / kg, the detection rate was 100.00% (26/26). Conclusion The survey of Urumqi milk powder market in some of the residues of rare earth elements, although the content is not high, but the detection rate is high, so the need to continue monitoring the content of rare earth elements in milk powder in order to protect people’s drinking milk safety .