悬浮进样-氢化物发生原子吸收法直接测定面粉中的微量砷

Direct Determination of Trace Arsenic in Flour by Suspension-sampling Hydride-generation Atomic Absorption Spectrometry

提出了一种悬浮进样-氢化物发生原子吸收光谱直接测定面粉中微量砷的新方法,实验考察和优化了影响砷信号强度的悬浮条件和氢化物发生条件。以0.3%琼脂作稳定剂,1%柠檬酸作增敏剂和正辛醇作消泡剂,得到了满意的分析效果。考察了共存离子的干扰,通过分析三种标准参考物质评价了方法的可靠性,测定结果与参考值之间不存在显著性差异(p=0.05)。本方法用于小麦、大米等5种面粉中砷的测定,检出限为0.239μg/L,回收率为95.5%～108%,相对标准偏差为0.86%～3.02%。本实验提出的方法具有操作简易、快速,灵敏度高等特点。

A novel suspension-sampling hydride-generation atomic absorption spectrometry was proposed for direct determination of trace arsenic in flour. The experimental conditions of suspension and hydride generation affecting the intensity of arsenic signal were investigated and optimized. The satisfactory result was obtained by using 0.3% agar as a stabilizing agent, 1% citric acid as a sensitizing agent, and n-octanol as an defoaming agent. The interferences of coexisting ions were also examined. Furthermore, the...