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有关水—N-二甲基甲酰胺(以下简称DMF)二元混合物的测定已有不少报道。Makarov—Zemlyansku Ya Ya等人试验了用硫酸、重铬酸钾组成的氧化液水解DMF成甲酸后再氧化,剩余重铬酸钾用硫酸亚铁铵滴定的化学分析方法。水溶液中微量的DMF可同羟胺反应生成异羟肟酸,用三价铁离子同生成的异羟肟酸反应生成红棕色化合物进行比色分析。对于微量水份的测定
There have been many reports about the determination of binary mixtures of water-N-dimethylformamide (hereinafter referred to as DMF). Makarov-Zemlyansku Ya Ya et al. Tested the chemical analysis of the oxidation of DMF to formic acid with an oxidizing solution consisting of sulfuric acid and potassium dichromate followed by titration of potassium dichromate with ammonium ferrous sulfate. A small amount of DMF in aqueous solution can react with hydroxylamine to form hydroxamic acid. The ferric ion is reacted with the formed hydroxamic acid to produce a red-brown compound for colorimetric analysis. For the determination of trace moisture