在测定含卤化物药品含量时,一般常采用银量法测定。由于此法在滴定过程中产生多量絮状沉淀,振摇均匀费时,同时硝酸银标准液不易保存,因此我们改用了汞量法测定含卤化物的药品。汞量法的优点是标准溶液稳定,操作简单迅速。在滴定中不产生沉淀;硝酸汞的价格也比硝酸银便宜。汞量法测定原理主要利用卤化物溶于水中,离解成气溴离子,它们与汞离子化合,生成相当的卤化汞。过多一点的汞离子和苯肼羧基偶氮苯或二苯胺基脲作用,生成深紫色化合物为终点。Roberts找出须将欲滴定溶液的pH值 Determination of the content of the halide-containing drugs, the general method is often used silver determination. Because this method produces a large amount of flocculent sedimentation in the titration process, shaking evenly and time-consuming, while the silver nitrate standard solution is not easy to preserve, so we use the mercury content method to determine the halide-containing drugs. Mercury method has the advantage of standard solution stability, simple and rapid operation. No precipitation occurs in the titration; the price of mercury nitrate is also cheaper than silver nitrate. Mercury quantitative determination of the principle of the main use of halide dissolved in water, dissociated into gas bromine ions, which combine with the mercury ion to generate a comparable mercury halide. A little too much mercury ion and phenylhydrazine carboxy azobenzene or diphenylaminyl urea role, generating dark purple compounds as the end point. Roberts identifies the pH of the solution to be titrated