石墨炉原子吸收法测定水中铊的方法改进

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0．9995；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％。

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

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%.