快速测定水中砷的石墨炉原子吸收光谱法

Rapid Determination of Arsenic in Water by Graphite Furnace Atomic Absorption Spectrometry

目的建立直接测定水中砷的石墨炉原子吸收法。方法将水样中加入适量硫酸镍,在一定波长、灰化、原子化温度下,直接进样测定。无需富集和萃取,亦无需将样品中的砷转化为砷化氢。结果砷含量在0.005～0.200mg/L呈线性关系,相关系数为0.9996,回收率为95.0%～105.0%,相对标准偏差4.0%～7.5%,最低检出浓度为0.005mg/L。结论与银盐法、氢化物发生-原子吸收法比较,具有操作简便、快速、适合批量样品分析等优点。

Objective To establish a method for direct determination of arsenic in water by graphite furnace atomic absorp-tion spectrometry.Methods The contents of arsenic in water samples were directly determined by graphite furnace atomic ab-sorption spectrometry under given conditions of wavelength,ashing and atomization temperature after adding an appropriate amount of nickel sulfate to water samples without enrichment,extraction or transformation of arsenic into hydrogen arsenide of the samples.Results The linear range of the method was0.005-0.200mg /L with a correlation coefficient of0.9996.The re-covery rate,relative standard deviation and detection limit were95.0%-105.0%,4.0%-7.5%and0.005mg /L respectively.Con clu sion Compared with the silver salt method and hydride generation-atomic absorption spectrometry,this method had many advantages such as simplicity of operation,rapidity and suitability for the analysis of batch samples.