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(CaNO₃₂)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.