Rapid quantitative detection method for determining iodine content in well and rock salt

A quantitative detection method and technology of iodine content, which is applied in the direction of analyzing materials through chemical reactions and observing the impact on chemical indicators, etc., can solve the limitations of popularization and application, and cannot detect the total iodine content of mine salt , test result deviation and other issues

Active Publication Date: 2013-04-17
HARBIN MEDICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, the detection method recorded in the previous case cannot detect the total iodine content in the mine salt, which will l

Method used

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  • Rapid quantitative detection method for determining iodine content in well and rock salt

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Embodiment Construction

[0035] The principle of the present invention is to use sodium hypochlorite to oxidize iodide ions into iodate under acidic conditions, use oxalic acid to remove excess sodium hypochlorite, then use potassium iodide to reduce iodate to generate iodine, use starch as indicator, and use sodium thiosulfate titration to determine iodine content. The reaction formula is as follows:

[0036] 3CIO - +I - →IO - 3 +3CI - ……(1)

[0037] h 2 C 2 o 4 +CIO - →CI - +2CO 2 +H 2 O...(2)

[0038] IO - 3 +5I - +6H + →3I 2 +3H 2 O...(3)

[0039] 2S 2 o 3 2- +I 2 →2I - +S 4 o 6 2 - ... (4)

[0040] Reagent:

[0041] 0.005mol / L sodium thiosulfate solution: accurately weigh sodium thiosulfate (Na 2 S 2 o 3 ·5H 2 O) 1.24g, dissolve in a 1L volumetric flask with deionized water, and dilute to the mark, and store in a refrigerator away from light.

[0042] 2mol / L sulfuric acid solution: slowly add 5.56ml of concentrated sulfuric acid into about 90ml of dis...

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Abstract

The invention discloses a rapid quantitative detection method for determining iodine content in well salt. The method comprises the following steps: (1), an appropriate amount of iodized salt is weighted, placed in a bottle and dissolved in water; (2), an appropriate amount of phosphoric acid is added in the bottle first to provide an acidic condition, then an appropriate amount of sodium hypochlorite solution is added and mixed evenly to oxidize iodine ions into iodate ions, and then an appropriate amount of oxalic acid solution is added to remove the residual sodium hypochlorite after the reaction with iodide irons; (3), an appropriate amount of potassium iodide solution is added in the bottle to allow full reaction between potassium iodide and iodate ions; (4), the solution in the bottle is titrated with sodium thiosulfate solution until the color of the solution in the bottle turns to be faint yellow; (5), starch indicator solution is added in to the bottle and shook evenly and then the solution in the bottle is titrated with the sodium thiosulfate solution until the color of the solution in the bottle disappear; and (6), the iodine content of the iodized salt is worked out according to the consumption amount of the sodium thiosulfate solution. Therefore, the method provided by the invention can be used to quickly and accurately determine the total iodine content in the well and rock salt.

Description

technical field [0001] The invention relates to a rapid quantitative detection method for iodine in salt, which is suitable for rapid quantitative analysis of iodine content in mine salt. Background technique [0002] Salt iodization is the most effective way to prevent and treat iodine deficiency diseases, and iodized salt monitoring is the most important work in the prevention and control work. Daily frequent and large amounts of iodized salt monitoring requires simple and accurate detection methods. However, the current quantitative detection method of iodized salt is cumbersome, time-consuming and slow to detect samples, and cannot meet the needs of large sample size and on-site detection work. [0003] In response to this situation, the applicant of this application once submitted an invention patent application to the State Intellectual Property Office: CN201210180708.0 (referred to as the previous case), which disclosed a rapid quantitative detection device and metho...

Claims

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Application Information

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IPC IPC(8): G01N21/78
Inventor 刘颖
Owner HARBIN MEDICAL UNIVERSITY
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