3种海蜇制品铝含量检测方法比较

Comparison of three methods of detecting aluminum content in jellyfish products

文章采用电感耦合等离子体质谱法(ICP-MS)、分光光度法和乙二胺四乙酸(EDTA)滴定法测定海蜇(Rhopilema esculentum)产品中的铝(Al)含量,对比检测结果、精密度和准确度差异,分析这3种方法在产业上应用的优缺点,并采用ICP-MS对中国10个沿海城市的即食海蜇产品进行了Al残留风险摸底调查。结果表明,ICPMS和分光光度法的测定结果差异不显著,EDTA滴定法与其他2种方法存在差异,但总体相差不大。3种测定方法对盐渍海蜇和即食海蜇样品的相对标准偏差(Relative standard deviation,RSD)介于1.79%~4.34%。ICP-MS对于盐渍海蜇和即食海蜇的加标回收率分别介于92%~104%和97%~100%,而分光光度法的加标回收率分别介于97%~102%和98%~101%,EDTA滴定法的加标回收率介于94%~99%,相对偏低。3种方法均符合检测要求,可根据实际需求选择合适的检测方法。此外还发现部分地区的即食海蜇Al残留量接近国家规定的限量标准。

In this paper,the content of aluminum in jellyfish(Rhopilema esculentum)was determined by inductively coupled plasma mass spectrometry(ICP-MS),spectrophotometry and EDTA titration.The differences of detection results,precision and accuracy were compared,and the advantages and disadvantages of three methods in industrial application were analyzed.The aluminum residue risk of ready-to-eat jellyfish in ten coastal cities of China was investigated by ICP-MS.The results show that there was no significant difference between ICP-MS and spectrophotometry.EDTA titration was different from the other two methods,but the difference was not significant.The relative standard deviation(RSD)of the three methods for salted jellyfish and ready-to-eat jellyfish ranged from 1.79%to 4.34%.The RSD of salted jellyfish and ready-to-eat jellyfish by ICP-MS were 92%−104%and 97%−100%,respectively.The RSD of spectrophotometry were 97%−102%and 98%−101%,respectively.The recovery of EDTA titration was 94%−99%,which were relatively low.The three methods all meet the testing requirements,and the appropriate testing method can be selected according to the actual needs.The results also indicate that the Al residue in ready-to-eat jellyfish in some areas is close to the national limit.