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关于生物制品氢氧化铝吸附剂中的铝含量测定,我们采用双硫腙络合滴定法(1)以来,结果尚为准确。但该法耗费乙醇较多,而且指示剂不够稳定。为此,我们于一九七三年参考有关文献,加以改进,以过氯酸溶解样品,并以二甲酚橙为指示剂进行络合滴定,对精制破类、精制白类、流脑菌苗等氢氧化铝吸附制剂中的铝含量,作了一些测定试验,结果比较满意,现将试验方法与结果介绍如下:
About biological products aluminum hydroxide adsorbent aluminum content determination, we use the dithizone complex titration (1), the result is still accurate. However, this method consumes more ethanol, and the indicator is not stable enough. For this reason, we made reference to the relevant literature in 1973 and improved it with perchloric acid to dissolve the sample and complexation titration with xylenol orange as an indicator. Miao and other aluminum hydroxide adsorption preparation of aluminum content, made some determination tests, the results are more satisfactory, now the test methods and results are as follows: