本文介绍一种用反萃取分离法测定各种天然水中的碘化物,即在酸性介质中,用四氯化碳萃取碘,然后用1,2-二氯乙烷反萃取亚甲蓝与碘化物生成的有色离子对,在657 nm处有最大吸收。其最大摩尔吸收系数为3.15×10~5Lmol~(-1)cm~(-1),线性范围为7.5×10~(-8)～3×10~(-6)M,在1.5×10~(-6)M时其相对标准偏差为 In this paper, a method for the determination of iodide in various natural waters by stripping extraction is described, that is, iodine is extracted with carbon tetrachloride in acidic media, and then methylene blue and iodide are stripped with 1,2-dichloroethane The resulting colored ion pair has a maximum absorption at 657 nm. The maximum molar absorption coefficient was 3.15 × 10 ~ 5Lmol -1 cm -1, the linear range was 7.5 × 10 -8 ~ 3 × 10 -6 M, (-6) M, the relative standard deviation is