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本文提出在0.1mol/LH_2SO_4,7.5×10~(-4)mol/LBr~-和6×10~(-5)mol/L丁基罗丹明B(R~+)的底液中,在+1.0V下,I~-离子于玻璃电极上被氧化生成I_2BrR离子缔合物,藉以阴极溶出伏安法测定碘、I~-离子浓度在1～50ppb范围内与峰电流呈线性关系。用于食盐中痕碘的测定。
In this paper, we propose that in the presence of 0.1 mol / LH 2 SO 4, 7.5 × 10 -4 mol / L LB and 6 × 10 -5 mol / L butyl rhodamine B (R ~ +) At 1.0V, I ~ - ions were oxidized to form I_2BrR ion complex on the glass electrode. The cathodic stripping voltammetry was used to determine iodine. The linear relationship between peak current and I ~ - ion concentration was in the range of 1 ~ 50ppb. For salt iodine determination.