原子吸光分析法による酸無水物の間接定量

概要

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Acid anhydrides were determined with good precision by atomic absorption spectrophotometry. The recommended procedures are as follows : To 1 ml of ethanol solution of each sample {(0.10〜4.00)mg/ml} is added 4 ml of NH_2OH-HCl-NaOH solution (a mixture of 150 mg-NH_2OH ・ HCl/ml solution and 85 mg NaOH/ml solution at a ratio 2:1 by v/v), and the mixture is allowed to stand for 10min. To this solution is added 2 ml of 1.2 N HCl, 1 ml of 7 mg FeC1_3・6H_2O/ml solution and 5 ml of 5.5 % NH_4OH solution. After standing for 10 min, the resulted solution is filtered. The iron in the filtrate is measured by atomic absorption spectrophotometry. There was no interference in the presence of 5 to 20 molar fold of acetone, acetic acid, aniline, nitrobenzene, phenol, K^+, Mg^<2+>, or Ca^<2+> and 1.5 molar fold of ethyl acetate, but a marked interference was observed when 0.001 to 0.01 molar fold of acetyl chloride, Cu^<2+> or Al^<3+> was present.
社団法人日本分析化学会の論文
1980-07-05