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在弱酸性介质中,以双液接(外管盛4 mol LKNO_3)甘汞电极为参比电极、P_(AB)电极为指示电极、用硝酸银连续电位滴定碘、溴、氯离子,其精密度与共存的碘、溴含量密切相关。在1mol L硝酸中滴定,不仅有较大的电位突跃,而且不同量的碘与500μg溴共存时,不影响彼此的测定硫酸钾的存在可使溴的滴定终点更趋敏锐,且dE dv峰值均提高1倍以上,峰尾的滞留现象也显著消失在1mol L硝酸—2×10~2mol L硫酸钾介质中进行测定,下列共存离子(以mg计)SO_4~(2-)(100)、Fe~(3(?))(20)、Fe~(2+)、(20)、
In weakly acidic medium, a double-contact (4 mol LKNO_3 outer tube) calomel electrode was used as the reference electrode and the P_ (AB) electrode was used as the indicator electrode. Titanium nitrate, iodine, bromine and chloride were continuously titrated with silver nitrate. Degree and coexistence of iodine, bromine content is closely related. Titration in 1 mol L nitric acid, not only a large potential jump, and different amounts of iodine and 500μg of bromine co-exist, does not affect each other’s determination of the presence of potassium sulfate titration end of bromine can become more acute, and dE dv peak (100 mg / L), Fe (superscript 2 +), Fe (superscript 2 +) and Fe ~ (3 (?)) (20), Fe ~ (2 +), (20),