石墨炉原子吸收光谱法测定生活饮用水中砷的方法优化

建立了石墨炉原子吸收光谱(GFAAS)法测定生活饮用水中砷的方法。升压放电空心阴极灯的使用,降低了基线噪声水平和检出限。对温度程序、化学基体改进剂和热稳定剂进行了优化并用于GFAAS测定砷,无需进行初步处理。研究结果显示,线性方程为y=0.00562x+0.00004,相关系数R为0.9983,样品体积为16μL时的检出限为0.26μg/L。加标回收率为98.1%~99.2%,相对标准偏差<5%。取实际饮用水样验证了其适用性。

Optimized Method for the Determination of Arsenic in Drinking Water by Graphite Furnace Atomic Absorption Spectrometry

A method for the determination of arsenic in drinking water by graphite furnace atomic absorption spectrometry (GFAAS) was established. The use of high boost discharge hollow cathode lamp reduces the baseline noise level and detection limit. Temperature program, chemical matrix modifier and heat stabilizer were optimized and applied to the determination of arsenic by GFAAS without preliminary treatment. The results showed that the linear equation was y=0.00562x+0.00004, with R 0.9983. LOD was 0.26 ug/L when the sample volume is 16 ug/L. The applicability of the method was verified by the actual drinking water samples. The recoveries ranged from 98.1% to 99.2%, and RSD was less than 5%.