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在有过量的Cu(Ⅱ)存在时,将痕量的碘离子Ⅰ~-以难溶化合物CuⅠ形式电沉积在汞膜电极上,然后以Fe(Ⅲ)或Hg(Ⅱ)为氧化剂进行氧化电位溶出法测定,可检出1.0×10~(-10)M的Ⅰ~-。用此法测得紫菜中碘的含量为3.3％(g/g),与分光光度法结果一致。
In the presence of excessive Cu (II), trace amounts of iodide I ~ - were electrodeposited on the mercury film electrode as CuI, then the oxidation potential of Fe (III) or Hg (II) Dissolution method determination, can be detected 1.0 × 10 ~ (-10) M Ⅰ ~ -. The content of iodine in seaweed measured by this method was 3.3% (g / g), which was consistent with the result of spectrophotometry.