石墨炉原子吸收法测定水中铊的方法改进

Improvement of Method for Determination of Thallium in Water by Graphite Furnace Atomic Absorption Spectrometry

采用石墨炉原子吸收法测定水中铊,对样品前处理的多个细节进行改进,使前处理过程耗时缩短,回收率提高。试验表明,方法在0μg/L^50.0μg/L范围内线性良好,相关系数r为0.999 5;检出限为2.0μg/L,取样量为500 mL,富集50倍时,方法检出限为0.04μg/L;实际水样测定结果的RSD为4.9%~8.4%;实际样品的加标回收率为94.0%~102%。

This study determined the Thallium in water by graphite furnace atomic absorption spectrometry and improved several details in pretreatment process.The pretreatment time is shortened and the recovery is en-hanced.Result indicate that the linear is good between the concentration of 0 μg/L ~50.0 μg/L,and the corre-lation coefficient is 0.999 5.The detection limit is 2.0 μg/L,while the detection limit of the method is 0.04 μg/L as the sample is concentrated from 500 mL to 10 mL.The RSD of determination for practical sample are 4.9%~8.4%,and the recovery of determination for practical sample are 94.0%~102%.