グラファイト炉原子吸光法における有機溶媒の影響

概要

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The combined use of organic solvent extraction and graphite furnace atomic absorption spectrometry is useful for removal of matrix interferences. But the precision tends to lower because of vaporization of organic solvent. In the use of an autosampler, vaporization of organic solvent causes error owing to long standing time before measurement in treating many samples. Copper-, lead-, and cadmium-diethyldithiocarbamates were investigated in various organic solvents. Absorbance of copper in methyl isobutyl ketone and chloroform increased with the standing time more than 30 min. To prevent the vaporization of organic solvent, the equilibrated aqueous solution or water was placed on the top of the organic solvent such as chloroform or carbon tetrachloride. By this method, the absorbance of metal in organic solvent, chloroform or carbon tetrachloride, did not increase for period up to 4 h. The use of an autosampler improved the precision, especially in the case of chloroform and carbon tetrachloride. The precision in organic solvent was comparable with that in aqueous standard solution.
社団法人日本分析化学会の論文
1979-08-05