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本比色法用于测定少于0.01％(重)氯酸钠的烧碱。向含有氯酸盐试料的强酸性溶液中,加入邻联甲苯胺,而生成稳定的黄色。试料的光密度,用分光光度计测定,氯酸钠的浓度由事先制备的标准曲线读出。结果按试料含NaClO_3的PPm表示。
This colorimetric method is used to determine caustic soda in less than 0.01% by weight sodium chlorate. To a strongly acidic solution containing a chlorate sample, ortho-toluidine is added to produce a stable yellow color. The optical density of the sample was measured spectrophotometrically and the concentration of sodium chlorate was read from a standard curve prepared in advance. Results according to the sample containing NaClO_3 PPm said.