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中国药典1995年版中氯化钠注射液含量测定与复方氯化钠注射液总氯量的测定均采用银量法,以荧光黄为吸附指示剂指示终点。在实际操作过程中,往往由于滴定终点突跃现象不明显而造成误差。究其原因主要有两点:一是由于测定方法未对待测溶液的pH值加以控制;二是就测定方法和对象而言,指示剂的选择不够恰当。其结果是当这两种注射液pH值在规定范围内偏下限时,含量测定终点突跃不明显。
Determination of sodium chloride injection in Chinese Pharmacopoeia 1995 edition and determination of total chlorine in compound sodium chloride injection are based on the silver amount method, with fluorescent yellow as the indicator of the end of the absorption. In the actual operation, often due to titration endpoint jump phenomenon is not obvious and cause errors. The reason there are two main reasons: First, because the determination of the test solution is not the pH of the solution to be controlled; the second is to determine the method and object, the indicator of the choice is not appropriate. The result is that when the pH of these two injections within the limits of the lower limit, the content determination of the end of the jump is not obvious.