电感耦合等离子体发射光谱法和电感耦合等离子体质谱法测定食品中铝结果一致性的研究

Consistency of determination results of aluminum in food by inductively coupled plasma atomic emission retrospect and inductively coupled plasma mass spectrometry

目的 研究电感耦合等离子体发射光谱法(inductively coupled plasma atomic emission spectrometry,ICP-OES)和电感耦合等离子体质谱法(inductively coupled plasma mass spectrometry,ICP-MS)测定食品中铝结果的一致性。方法 取1份大米粉称取0.2~0.3 g加入8 mL硝酸微波消解,超声赶酸后纯水定量转移入25 mL容量瓶中,分别用ICP-OES和ICPMS进行测定,对2种方法测定结果进行不确定度评定。结果 使用ICP-OES法测定结果为16.0 mg/kg,进行不确定度评定后的结果及其扩展不确定度为(12.1±3.6)mg/kg,k=2。使用ICP-MS法样品测定结果为12.4 mg/kg,进行不确定度评定后其结果及其扩展不确定度为(12.4±5.4)mg/kg。ICP-OES法测定结果的可能分布范围为8.5~15.7 mg/kg,ICP-MS法测量结果的可能分布范围为7.0~17.8 mg/kg,ICP-OES法结果分布完全包含于ICP-MS法的结果分布范围中。结论 进行不确定度评定并进行加标回收率校正后ICP-OES和ICP-MS测定食品中铝的结果具有一致性。

Objective To study the consistency between the results of inductively coupled plasma atomic emission spectrometry(ICP-OES) and inductively coupled plasma mass spectrometry(ICP-MS) in the determination of aluminum in food. Methods 0.2-0.3 g of a portion of rice flour was weighed and added into 8 mL nitric acid for microwave digestion. After ultrasonic acid removal,the samples were quantitatively transferred into a 25 mL volumetric flask with pure water,and determined by ICP-OES and ICP-MS respectively. The uncertainty of the results of the two methods was evaluated. Results The determination result using ICP-OES was 16.0 mg/kg,and the uncertainty evaluation showed that the result and the expanded uncertainty was(12.1±3.6)mg/kg,k =2. The determination result using ICP-MS was 12.4 mg/kg,and the uncertainty evaluation showed that the result and the expanded uncertainty was(12.4±5.4)mg/kg. The possible distribution range of the results measured by ICP-OES method was 8.5-15.7 mg/kg,and the possible distribution range of the results measured by ICP-MS was 7.0-17.8 mg/kg. The distribution of the results measured by ICP-OES method was completely included in the distribution range of the results measured by ICP-MS method. Conclusion The results of determination of aluminum in food by ICP-OES and ICP-MS are consistent after uncertainty evaluation and recovery correction.