摘要
采用离子色谱分离和脉冲安培检测婴幼儿营养米粉中添加的碘化钾或碘酸钾含量。考察了蛋白质去除的方法和试剂用量，优化了超声提取净化方案，研究了碘酸钾转化成碘化钾的最佳还原剂用量，进行了淋洗液浓度和检测器波形等仪器条件的选择。在优化实验条件下，碘化钾和碘酸钾的线性范围均为1～100μg/L，相关系数分别为0．9991和0．9999，定量下限分别为5．2、9．0ng／g。碘化钾和碘酸钾的加标回收率分别为74％～100％和75％～100％，相应的相对标准偏差分别为4．4％～6．7％和5．0％～6．9％。
An ion chromatographic method in combination with pulsed amperometric detection was developed for the analysis of added iodide and iodate in infant formula cereal products. The protein removal mode and the amount of protein precipitant were studied. The opitimun conditions for ultra- sonic extraction were explored and the dosage of reductant for iodate to iodide was investigated. Under the optimum conditions, the method showed good linearity in the range of 1 - 100 μg/L for iodide and iodate with correlation coefficients of 0. 999 1 and 0. 999 9, respectively. The quantitation limits were 5.2 ng/g and 9.0 ng/g, respectively. The spiked recoveries for iodide and iodate were in the range of 74% - 100% and 75% - 100% , respectively, with RSDs of 4.4% -6.7% and 5.0% - 6.9% , respectively.
出处
《分析测试学报》
CAS
CSCD
北大核心
2011年第1期99-102,共4页
Journal of Instrumental Analysis
基金
国家认监委检验检疫行业标准项目(2008B079)
