摘要
A new simple, rapid and sensitive spectrophotometric method for the determination of chlordiazepoxide is described, based on the reaction with 2,4-dinitrophenol in water medium, apparently by a charge-transfer mechanism, to yield 1:1 complex with maximum absorption at 444 nm. Optimum experimental conditions for the determination have been studied. The linear calibration range, apparent molar absorptivity and relative standard deviation are 2.8~96.0 mgmL-1, 1.48103 and 0.32%, respectively. The method is accurate and has been successfully applied to the determination of chlordiazpoxide in tablets. The results are in good agreement with those obtained with the official method.
本文报道了基于氯氮革与2,4-二硝基苯酚在水溶液中的荷移反应测定氯氮革含量的方法。详细研究了荷移反应的条件和影响荷移反应的因素，结果表明，氯氮革与2,4-二硝基苯酚于20℃水溶液中恒温20分钟即可形成l：l的络合物；在其最大吸收波长444nm处表观摩尔吸光系数为ε=1．48×10^3L·mol^-1·cm^-1；并在2．8-96μg·mL^-1范围内符合比尔定律；方法的相对标准偏差为0．32％。将拟定的方法应用于氯氮革片剂样品含量的测定，并与药典法相比较，结果基本一致。
