双指示电极电位滴定-流动注射分析法测定铀矿石中铀
Determination of Uranium in Uranium Mine by Means of Flow Injection Analysis With Potentiometric Titration Using Double Indicator Electrodes
-
摘要: 将双指示电极电位滴定与流动注射分析方法相结合，建立了准确测定铀矿石中铀的新方法。在该方法中，用钒酸铵和氟化钠的混合溶液作为滴定剂，在流通池中同时插入铂电极和氟离子指示电极，在滴定过程中的任一滴定点，流出液的铀电位EU和滴定进度f可由两个电极的电位测定值同时获得。该方法消除了体积读数产生的误差，又减少了试剂和样品的消耗量，且可自动批量进样，大大提高了检测速度，分析过程中，辐射强度小。应用该方法对铀矿中的铀进行了测定，其相对标准偏差小于0.5%(n=3)，回收率为99.3%~100.3%。Abstract: A new flow injection analysis method coupled with potentiometric titration using double indicator electrodes for the precise determination of uranium in uranium mine has been developed. In this method, the titrant is a mixture of ammonium vanadate and sodium fluoride, both platinum electrode and fluoride electrode are inserted in the flow cell. In a process of titration, both the potential of uranium and the volume ratio of the titrant and the titration solution can be obtained simultaneously from the two electrodes at each titration point. The method is free of volumetric and reduces the consumption of reagent and sample. The method is also very quick in analysis rapidity and depresses radiant intensity in the process of analysis. The method has been applied to the determination of the uranium concentrate in uranium mine with the relative standard deviation less than 0.5% (n=3) and the recovery of 99.3%-100.3%.
-
-
[1] 朱海巧,吴继宗,罗中艳.萃取光度法精密测定铀[J].原子能科学技术,2011,45(8):915-919. [2] 杨金辉,谭海明,胡凯光.硫酸-亚钛-钒酸铵容量法测定矿石中铀[J].铀矿冶,2004,24(3):147-150. [3] 徐卫东,孙荣,朱霞萍,等.亚钛还原钒酸铵微量滴定法测定矿石中微量铀方法的改进[J].岩矿测试,2010,29(3):325-327. [4] 刘权卫,罗中卫,朱海巧,等.自动电位滴定法精密测定小量铀[J].原子能科学技术,2007,41(5):546-549. [5] 姚海云,谭靖,夏晨光.全自动电位滴定分析仪精密测定矿石中的铀[J].铀矿地质,2004, 20(3):177-182. [6] 邓昌爱,廖力夫,丁娟,等.多元校正流动注射电位滴定法同时测定苯甲酸和山梨酸[J].广州化学，2009，34（04）：19-24. [7] 邓昌爱，廖力夫，丁娟.流动注射多元校正-络合滴定法同时测定混合金属离子[J].化学分析计量，2010，19（04）：22-25.
计量
- 文章访问数: 883
- HTML全文浏览量: 0
- PDF下载量: 4423
下载:
