Modification of electrothermal atomic absorption spectrometry for determination of arsenic in high salinity samples

Abstract

The electrothermal atomic absorption spectrometry (ET-AAS) method was optimized for determination of the arsenic content in high salinity samples. The combination of palladium (1 g/l) modifier, graphite furnace temperature program and graphite tube modified with tungsten carbide significantly reduced the matrix interference in the sample with NaCl concentration of 10 g/l. Optimized temperature program ensured the reduction of the background absorbance about 95–100%. The modification of graphite furnace surface by tungsten carbides ensured the shift of background absorbance prior to the absorbance of the analyte and considerable extension lifetime of graphite tubes.The electrothermal atomic absorption spectrometry (ET-AAS) method was optimized for determination of the arsenic content in high salinity samples. The combination of palladium (1 g/l) modifier, graphite furnace temperature program and graphite tube modified with tungsten carbide significantly reduced the matrix interference in the sample with NaCl concentration of 10 g/l. Optimized temperature program ensured the reduction of the background absorbance about 95–100%. The modification of graphite furnace surface by tungsten carbides ensured the shift of background absorbance prior to the absorbance of the analyte and considerable extension lifetime of graphite tubes.