采用溶剂提取法对奶粉样品进行前处理,样液通过色谱柱进行分离,由电感耦合等离子体质谱仪进行碘的定量分析。方法优化了样品前处理条件及仪器条件,可对样品中碘离子及碘酸根进行分离测定,仪器检出限均为0.000 1 mg/L,方法定性检出限为0.01 mg/kg,方法定量检出限为0.05 mg/kg,样品测定的精密度为2.67%~4.11%,加标回收率为98.0%~106%。 The solvent extraction method was used to pre-treat the milk powder sample, and the sample liquid was separated through a chromatographic column. Quantitative analysis of iodine was performed by inductively coupled plasma mass spectrometry. Methods The sample pretreatment conditions and instrument conditions were optimized to separate the iodine and iodate in the sample. The detection limits were 0.000 1 mg / L, and the detection limit was 0.01 mg / kg. The method was quantitative The limit was 0.05 mg / kg, the precision of the sample was 2.67% -4.11%, and the recoveries of spiked samples were 98.0% -106%.