氢化物发生-原子吸收法测定食盐中痕量砷的研究

Study on the Determination of Trace As in Salt by Hydride Generation-Atomic Absorption Spectrometry

建立了测定食盐中痕量砷的氢化物发生-原子吸收法,探讨了盐酸、硼氢化钾溶液浓度以及样品还原处理对测定结果的影响,测定结果的相对标准偏差(n=6)小于2.23%,回收率范围为93.2%～104.2%。测砷的线性范围为0～50μg/L,检出限为0.41μg/L。

The determination of As in salt by hydride generation-atomic absorption spectrometry is established.The influence of the hydrochloric acid and potassium borohydride solution as well as the sample reducing on the determination result are studied.The relative standard deviations of the determination result (n=6)is less than 2.23% and the range of recovery rate is 93.2%～104.2%.The linear range of As determination and the detection limits are 0～50μg/L and 0.41μg/L respectively.