Determination of migration of trace Cd in food contact materials by sequential injection-hydride generation-atomic fluorescence spectrometry
A method for the determination of migration of trace Cd in food contact materials by sequential injection-hydride generation-atomic fluorescence spectrometry with sulfourea and Co2+ as a sensitizer was developed and serious suppressed interference of 4% acetic acid matrix was eliminate using direct dilution. The optimal instrument condition was established. The influence factors such as Co2+ , the acidity of sample solution and carrier liquid, the concentrations of NaBH 4 , the interference of coexistent elements and acetic acid matrix and eliminating methods were investigated. The detection limit was 0.035 μg/L, the LOQ was 0.001 mg/L, the relative standard deviations were2.36%～4.02%(n=8) and the recoveries were in the range of 95.1%～101%. The method is sensitive, simple, quick and accurate, which could be used for determination of migration of trace Cd in food contact materials.