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采用直接稀释法消除4%乙酸基体对原子荧光法测定镉的严重抑制干扰,建立了以钴和硫脲作增敏剂-顺序注射-氢化物发生-原子荧光光谱法测定食品接触材料中痕量镉迁移量的检测方法。优化了HG-AFS测定条件,研究了钴离子浓度、介质酸度、载流酸度、硼氢化钠浓度及共存元素及乙酸基质的干扰及消除方法。检出限为0.035μg/L,测定低限为0.001mg/L,相对标准偏差为2.36%～4.02%(n=8),回收率范围为95.1%～101%。方法灵敏、准确、快速、简便,适用于食品接触材料中痕量镉迁移量的测定。
Direct dilution method was used to eliminate the serious inhibitory interference of 4% acetic acid matrix on the determination of cadmium by atomic fluorescence spectrometry. The determination of trace amounts of trace elements in food contact materials by sequential injection-hydride generation-atomic fluorescence spectrometry with cobalt and thiourea as sensitizers Cadmium migration detection method. The conditions for the determination of HG-AFS were optimized and the interferences and elimination methods of cobalt ion concentration, medium acidity, acidity, sodium borohydride concentration, coexisting elements and acetic acid matrix were studied. The detection limit was 0.035μg / L, the lower limit of determination was 0.001mg / L, the relative standard deviation was 2.36% ~ 4.02% (n = 8), and the recovery range was 95.1% ~ 101%. The method is sensitive, accurate, rapid and simple and is suitable for the determination of trace Cd migration in food contact materials.