KSCN-NaBH4-氢化物发生-原子荧光光谱法联合测定食品和环境样品中的镉和锡

本文试验了在KSCN-NaBH4系统中,氢化物发生-原子荧光光谱法联合测定食品和环境样品中的镉和锡。在最佳实验条件下的检出限:Cd0.0024ng/ml、Sn0.17ng/ml;线性范围:Cd 0-2ng/ml,相关系数为0.9999,Sn0-100ng/ml,相关系数为0.9998;0.5ng/ml Cd得到的测量精密度(RSD)为1.3%、25ng/ml Sn得到的测量精密度(RSD)为2.9%;样品加标回收率:Cd 90.0%-102.0%、Sn 92.3%-99.7%。方法具有操作简便、快速、检出限低、灵敏度高、结果准确等优点,适合于食品和环境样品中镉、锡的联合测定。

Synchronizing determination of cadmium and tin in food and environmental samples by KSCN-NaBH4-HG-AFS

To establish a method for the synchronizing determination of cadmium and tin in food and environmental samples by Hydride Generation - Atomic Fluorescence Spectrometry in a system of KSCN - NaBH4. Under the proposed conditions, the detection limits are 0.0024ng/ml for cadmium and 0.17ng/ml for tin. The linear calibration curve for cadmium is within the range of 0 - 2ng/ml which correlative coefficient is 0.9999, and for tin is within the range of 0 - 100ng/ml which correlative coefficient is 0.9998. The RSD for cadmium at 0.5ng/ml is 1.3% and for tin at 25ng/ml is 2.9% .The recovery rates of standard spiking for cadmium and tin are in the range of 90.0% - 102.0% and 92.3% - 99.7%, respectively. This method is simple, rapid, of low detection limits, sensitive and of accurate. Therefore, the established method is suite the purpose of the synchronizing determination of cadmium and tin in food and environmental