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海带、紫菜等海生植物,大量富集海洋中的碘,含碘量特别丰富,不但可作人体需碘的来源,而且还可作为提取碘的原料。在有关这类植物样品的分析工作中,比色和活化分析法的报道较多。但即使采用活化分析也还得经消化、提取、分离等步骤,手续甚为繁复,分析一个样品一般取样量在1克以上,所需时间约为一小时。我们研究了在络合介质中碘的阴极溶出伏安测定法,检出限达到6.3×10~(-9)M并有效地消除了重金属元素的干扰。现配以氧瓶燃烧法进行前处理。方法灵敏、简便、快速。分析一个样品取样只需几十毫克,时
Kelp, seaweed and other marine plants, a large number of enrichment of marine iodine, iodine content is particularly rich, not only for human sources of iodine, but also as a raw material for the extraction of iodine. In the analysis of such plant samples, colorimetric and activation assays have been reported. But even with the activation analysis also have to digestion, extraction, separation and other steps, the procedure is very complicated, the general analysis of a sample sampling volume of 1 gram or more, the time required for about one hour. We studied the cathodic stripping voltammetry of iodine in a complexing medium with a detection limit of 6.3 × 10 -9 M and effectively eliminated the interference of heavy metal elements. Is equipped with oxygen bottle combustion method for pre-treatment. The method is sensitive, simple and fast. Only a few dozen milligrams are needed to analyze a sample