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前言氯、溴、碘三种离子共存时,总是互相干扰各自的测定结果。 Belcher等曾提出较繁琐的容量分析法解决氯、溴、碘的同时测定:(1)氰代氧化汞溶液滴定氯、溴、碘三种离子总量。(2)次氯酸氧化法-碘量法测定溴、碘二种离子量。(1)-(2)得氯离子量。(3)碘量法测定碘离子量。(2)-(3)得溴离子量。近来,Prokopov采用电位滴定及容量分析法:(1)银电极作指示电极,饱和甘汞电极(硝酸钾盐桥)作外参考电极,以Ag~+标准溶液电位滴定氯、溴、碘三种离子总量。(2)用H_2O_2—8-羟基喹啉消除Br~-及I~-后电位滴定氯离子量。(3)碘量法测定碘离子量。最后用差减法得到溴离子量。这个方法较Belcher等的方法简便,但所应用的碘量法仍嫌繁琐。
Preface Chlorine, bromine, iodine three kinds of ions coexist, always interfere with each other’s respective determination results. Belcher et al. Proposed more complicated volumetric analysis to solve the simultaneous determination of chlorine, bromine and iodine: (1) titration of total ions of chlorine, bromine and iodine with titanyl mercuric chloride solution. (2) hypochlorous acid oxidation - iodometric method for the determination of two kinds of ions of bromine and iodine. (1) - (2) chloride ion content. (3) iodometric method for the determination of iodine ion. (2) - (3) bromide ion amount. Recently, Prokopov uses potentiometric titration and volumetric analysis: (1) silver electrode as the indicator electrode and saturated calomel electrode (potassium nitrate bridge) as the external reference electrode for the titration of chlorine, bromine and iodine with Ag + standard solution The total amount of ions. (2) Elimination of Br ~ - and I ~ - potentiometric titration of chloride ion with H_2O_2-8-hydroxyquinoline. (3) iodometric method for the determination of iodine ion. Finally, subtraction method to get the amount of bromide. This method is simpler than the method of Belcher et al., But the iodometric method used is still cumbersome.