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电离常数小于10~(-9)的弱酸或弱硷类物质,不可能在水溶液內直接进行酸硷滴定。近年来,非水溶液滴定成功地解决了这类物质的分析問題。最近,Critchfield等发現在高浓度中性盐溶液中,用酸滴定弱硷性物质时突跃有显著的增加。那末,在浓盐溶液中进行某些弱硷性药物的中和滴定以求其含量,便有可能了。因此作者以氨基比林(K_b=6.9×10~(-10)),烏洛托品(K_b=1∶4×10~(-9))两种药物为对象,分別研究了:(1)对氯化鋰、氯化鈉、氯化鉀、溴化鈉、碘化
Ionization constant is less than 10 ~ (-9) of weak acid or weak alkaline substances, it is impossible to directly titrate the pH in aqueous solution. In recent years, non-aqueous titration successfully solved the analysis of such substances. Recently, Critchfield et al. Found that there was a significant increase in the jump in the acid-titration of weakly basic substances in high-concentration neutral salt solutions. Then, the neutralization titration of certain weakly alkaline drugs in concentrated salt solution to find its content, it is possible. Therefore, the authors studied two drugs: aminopyrine (K_b = 6.9 × 10 -10) and urotropin (K_b = 1: 4 × 10 -9) Lithium chloride, sodium chloride, potassium chloride, sodium bromide, iodized