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- Title
自制Z-Ⅱ碘探针应用于快速测定食盐及海带中的无机碘和有机碘.
- Authors
李攀攀; 崔琬晶; 侯红芳; 郑静雨; 潘秀云; 郭亚飞; 邓天龙
- Abstract
BACKGROUND: At present, the analysis of iodine content in salt and kelp products is mainly determined in the form of total iodine content, while the speciation analysis of inorganic iodine and organic iodine mainly relies on the hyphenated techniques of large-scale instruments. OBJECTIVES: The Z-Ⅱ iodine probe was used to establish the determination method of iodine content in edible salt and kelp as well as the digestion method for the organic iodine in the closed Teflon bomb. METHODS: This paper introduced a rapid method for determination of inorganic and organic iodine content in salt and kelp products by using crystal membrane electrode technique with a solid-state and no internal reference liquid crystal film electrode (Z-Ⅱ iodine probe) developed by silver sulfide iodide method. RESULTS: The results showed that table salt contained about 20mg/kg of inorganic iodine, 2mg/kg of organic iodine, and 2.9g/kg of organic iodine in kelp. The linear correlations of inorganic and organic iodine contents in the range of 10-100mg/kg were good. The standard recovery rate was 98.24%-104.38%, and the detection limit was up to 1mg/kg. Applied to the determination of iodine content in actual samples of salt and kelp on the market, the relative standard deviation of the determination results of inorganic and organic iodine in the samples was less than 0.92% and 4.20%, respectively. The analytical results were agreement with those of the national standard method and ultraviolet spectrophotometry method, which indicated that the established method was reliable. CONCLUSIONS: The analytical method established in this work has the advantages of low reagent consumption, low cost and convenient operation, and it can be used for the determination of inorganic and organic iodine contents.
- Subjects
LIQUID crystal films; SILVER iodide; ULTRAVIOLET spectrophotometry; SPECIATION analysis; SALT; SILVER sulfide; POLYMER liquid crystals
- Publication
Rock & Mineral Analysis, 2020, Vol 39, Issue 1, p108
- ISSN
0254-5357
- Publication type
Article
- DOI
10.15898/j.cnki.11-2131/td.201904260049