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用絡量法测定氢氧化鋁片的含量,一般以二苯硫代偕肼腙为指示剂。該指示剂需新鮮配制,不能久貯,测定中还需多量乙醇。为了簡化操作,节約乙醇,有必要加以改进。近年来,文献报道,鋁盐的絡合滴定可采用二甲酚橙(xylenol orange)为指示剂,終点敏銳,溶液稳定。作者参照有关文献試用这种指示剂于氢氧化鋁片的絡量测定,結果滿意。現介紹于后,供大家参考。
Volume method with the determination of aluminum hydroxide content, usually with diphenyl thiohydrazone hydrazone as an indicator. The indicator to be freshly prepared, can not be stored for a long time, the determination of the need for large amounts of ethanol. In order to simplify the operation, saving ethanol, it is necessary to be improved. In recent years, the literature reports that the complexation titration of aluminum salts can be used xylenol orange as indicator, the end point sensitive, the solution is stable. The author with reference to the literature trial of this indicator in the determination of the amount of aluminum hydroxide tablets, the results were satisfactory. Now introduced later, for your reference.