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 mechani...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.展开更多
文摘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.
文摘将间接电合成苯甲醛与电还原马来酸制备丁二酸的过程有机结合,构建了一个新的成对电解体系,即在隔膜电解槽中,以纯Pb为阴极,PbO2/Pb为阳极,硫酸溶液为介质,在施加超声波的条件下,阳极氧化Ce3+为Ce4+,阴极还原马来酸生成丁二酸;同时,在槽外采用Ce4+氧化甲苯生成苯甲醛.实验结果表明,阴极和阳极电解的平均电流效率分别为92.71%和87.81%,总的电流效率高达180.52%;且Ce4+槽外氧化甲苯为苯甲醛的收率为95.78%,马来酸电还原为丁二酸的转化率为92.09%;电解的槽电压与单一电解氧化Ce3+相比降低了0.25 V.
