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氯溴碘三种离子共存时,总是互相干扰各自测定结果。近年来,Prokopov采用电位滴定及碘量法滴定完成氯溴碘的同时测定。这个方法较Belcher等早期提出的容量分析法简便,但所应用的碘量法测定碘离子操作仍嫌繁琐。本文采用电位法:1.用自制Ag-AgCl丝电极作指示电极,玻璃电极作参比电极,在90％丙酮介质中用标准Ag~+ 溶液电位滴定氯溴碘三种离子总量。2.用双氧水-8-羧基喹啉消除 Br~- 及I~- 后,在90％丙酮介质中电位滴定氯离子量。3.用
Chlorobromide iodine three ions coexist, always interfere with each other their respective determination results. In recent years, Prokopov potentiometric titration and iodometric titration to complete the simultaneous determination of chlorine bromine and iodine. This method is simpler than the capacity analysis previously proposed by Belcher et al. However, the iodide method used to determine iodide is still cumbersome. Potentiometric method was used in this paper: 1. Using homemade Ag-AgCl wire electrode as indicator electrode and glass electrode as reference electrode, the total amount of three ions of chloro-bromoiodide was titrated in 90% acetone with standard Ag + solution potentials. 2. With hydrogen peroxide 8-carboxyquinoline eliminate Br ~ - and I ~ -, 90% acetone in the potential titration chloride ion. Use