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本文报道在0.004mol·L~(-1)柠檬酸钠—0.1mol·L~(-1)氯化钾-0.016mol·L~(-1)盐酸底液中,使用玻碳工作电极和罗丹明B为有机吸附沉淀剂,阴极溶出伏安法测定痕量碘的方法。线性范围为4.7×10~(-9)～1.0×10~(-6)mol·L(-1),检出限为1.57×10~(-9)mol·L~(-1),可在其它卤离子(F~-、Cl~-、Br~-)和Sb~(3+)等离子共存下测定痕量碘,应用于地矿标样中痕量碘的分析,回收率在94%～102%之间,结果满意。
This paper reports the use of glassy carbon working electrode and rhodan in a 0.004 mol·L -1 sodium citrate-0.1 mol·L -1 potassium chloride-0.016 mol·L -1 HCl bottoms solution. Ming B organic adsorption precipitant, cathodic stripping voltammetric method for the determination of trace iodine. The linear range was from 4.7 × 10 -9 to 1.0 × 10 -6 mol·L -1 with a detection limit of 1.57 × 10 -9 mol·L -1 Determination of trace iodine in the coexistence of other halides (F ~ -, Cl ~ -, Br ~ -) and Sb ~ (3+) ions was applied to the determination of trace amounts of iodine in geochemical samples with a recovery of 94% ~ 102%, the results are satisfactory.