论文部分内容阅读
络合电位滴定法测定钨虽有不少报导,但由于钨酸铅沉淀条件的严格和钨在酸性介质中易生成聚多酸,致使该法难以获得准确的结果,迄今仍未广泛应用于惯常分析工作中。本工作采用铅离子选择性电极为指示电极,电位滴定法测定钨,能提高有沉淀存在下滴定的准确性。并选取在测定液中加入标准铅溶液,使铅沉淀为钨酸铅,用EDTA电位滴定
Although there are many reports on the determination of tungsten by complexometric titration, due to the strict precipitation conditions of lead tungstate and the easy formation of polyacid by tungsten in acidic medium, the method is difficult to obtain accurate results and has not yet been widely used in habitual Analysis work. In this work, lead ion selective electrode is used as indicator electrode and potentiometric titration method is used to measure tungsten, which can improve the accuracy of titration in the presence of precipitate. And select the standard solution of lead in the test solution, lead precipitation lead tungstate, titration with EDTA potential