优化石墨炉原子吸收法测定生活饮用水中微量钡

目的对石墨炉原子吸收法的仪器条件及基本改进剂进行优化, 以测定生活饮用水中的钡。方法将样品混合均匀过滤后, 加入硝酸钙作为基体改进剂, 用经优化了仪器条件的石墨炉原子吸收法进行测定生活饮用水中钡含量。结果检出限为3.1×10^-12g, 样品的加标回收率在94.0%~98.0%之间, RSD均<7.6%, 在0~50 μg/L的范围内具有良好的线性关系, 相关系数r=0.999 6。结论此方法可以灵敏、准确的测定生活饮用水中微量钡。

Determination of trace barium in drinking water by optimized GFAAS

ObjectiveTo optimize the instrumentation condition and matrix modifiers of graphite furnace atomic absorption spectrometry(GFAAS)to determine trace barium in drinking water.MethodsThe drinking water samples were mixed and filtered,with calcium nitrate(Ca[NO₃]₂)as the matrix modifier;then the content of barium in the samples was analyzed with optimized GFAAS.ResultsThe lowest detection limit of the method was 3.1×10^-12 g;the recovery of standard addition was 94.0% -98.0% ;the relative standard deviation(RSD)was less than 7.6% ;and the linear range was 0-50 μg/L,with a correlation coefficient of 0.9996.ConclusionThis method is sensitive,accurate for determination of trace barium in drinking water.