硫酸铈连续滴定法测定污酸固砷氧化前液中的Fe^(2+)和As^(3+)

The Determination of Fe^(2+)and As^(3+)in the pre-oxidation solution of acid-fixing arsenic by continuous Titration with Cerium Sulfate

对污酸固砷氧化前液中的Fe^(2+)和As^(3+)含量的测定,提出了采用分取一定量试液,再移取一定量体积的纯水,加入硫酸溶解,用亚铁灵作指示剂,硫酸铈标准溶液作滴定剂快速测定酸污酸固砷氧化前液中的Fe^(2+)含量,然后再加一定量的冰乙酸和混合催化剂继续测定污酸固砷氧化前液中的As^(3+)含量,建立了硫酸铈连续滴定法测定污酸固砷氧化前液中的Fe^(2+)和As^(3+)的方法。试验表明,该方法操作简单、快速,分析结果稳定,能够满足污酸固砷氧化前液中的Fe^(2+)和As^(3+)的监控要求。

For the determination of Fe^(2+) and As^(3+) content in the pre-oxidation solution of acid-fixing arsenic,,it is proposed that a certain amount of test solution which is separated,and then a certain volume of pure water is removed and dissolved with sulfuric acid,and the content of Fe^(2+) in the pre-oxidation solution of acid-fixing arsenic,is rapidly determined by using ferrous spirit as indicator and cerium sulfate standard solution as titrant.Then a certain amount of glacial acetic acid and mixed catalyst to continue titrating the content of As^(3+) was added in the pre-oxidation solution of acid-fixing arsenic,.The proposed method for the determination of Fe^(2+) and As^(3+) in the pre-oxidation solution of acid-fixing arsenic,by continuous titration with cerium sulfate was established.The experimental results show that the method is simple,rapid and stable,and can meet the monitoring requirements of Fe^(2+) and As^(3+) in the pre-oxidation solution of acid-fixing arsenic,.