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Iodine content on site rapid quantitative detection reagent in common salt added with iodine and preparation process thereof

A quantitative detection and detection reagent technology, which is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by causing materials to undergo chemical reactions, can solve the problem of affecting the effect of iodine deficiency disease prevention and treatment, low accuracy, and on-site detection. Distortion and other issues

Inactive Publication Date: 2009-04-22
张质毅 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned semi-quantitative colorimetric methods have a small color scale corresponding to the concentration gradient and low precision, so that the semi-quantitative pass rate of iodized salt is almost as high as 100%, but the pass rate of the same batch of samples in the laboratory is only 50-60%. , resulting in distortion of on-site detection, seriously affecting the prevention and treatment effect of iodine deficiency diseases

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh potassium iodide, starch, phosphoric acid, sodium thiosulfate, deionized water and formamide in proportion,

[0020] Prepare 5% potassium iodide aqueous solution (W / V);

[0021] Prepare 0.5% starch aqueous solution:

[0022] Take 0.5 g of soluble starch into a paste with water, pour it into 100 ml of boiled deionized water, boil it for 20-30 seconds, and immediately cool it to room temperature with water;

[0023] Prepare sodium thiosulfate solution:

[0024] Dissolve 5g sodium thiosulfate in 1000ml carbon dioxide-free water, store it in a brown bottle, let stand for one week, take 200ml supernatant and add 0.2g sodium carbonate, after dissolving, dilute with carbon dioxide-free water to 2000ml, add 10.00ml Add 0.002 equivalent potassium iodide standard solution in a 250ml iodine flask, add 90ml of water and 1.0ml of 85% phosphoric acid, shake well, add 5ml of potassium iodide solution, calibrate with sodium thiosulfate solution immediately, and add 5ml of 0.5% starch...

Embodiment 2

[0027] Calculated as 5ml per test reagent, in addition to ion exchange water, there are the following substances: potassium iodide 12.5mg, starch 1.25mg, phosphoric acid 12.75mg, formamide 0.01mg, sodium thiosulfate 0.2-0.5mg, its process It is to prepare a 5% potassium iodide aqueous solution (W / V); prepare a 0.5% starch aqueous solution (take 0.5 g of soluble starch into a paste with a small amount of water, pour it into 100 ml of boiling deionized water, and then boil for 20-30 seconds, and then immediately cool it to Room temperature); prepare sodium thiosulfate solution (dissolve 5 g of sodium thiosulfate in 1000 ml of carbon dioxide-free water, store in a brown bottle, let stand for one week, take 200 ml of supernatant and add 0.2 g of sodium carbonate, dissolve it with no carbon dioxide Make the volume of water to 2000ml, draw 10.00ml and add 0.002 mol potassium iodide standard solution into a 250ml iodine flask, add 90ml water, 1.0ml 85% phosphoric acid, shake well, add 5m...

Embodiment 3

[0029] Prepare 10% potassium iodide aqueous solution (W / V);

[0030] Prepare 1.0% starch aqueous solution (W / V); take soluble starch into a paste with water, pour it into boiling ion-exchange water, boil it for 20-30 seconds, and immediately cool it to room temperature with water;

[0031] Prepare sodium thiosulfate standard solution; 0.002 mol / L;

[0032] Take the calibrated sodium thiosulfate standard solution and add it to the on-site quantitative detection reagent with 1.0% starch, 85% phosphoric acid, 10% potassium iodide and 0.03 mg formamide as the base solution according to the required different concentration standards, to 50, 20, The concentration of 5ug / ml is used as an on-site quantitative detection reagent for iodized salt.

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Abstract

The invention discloses a field rapid quantitative detection reagent for testing iodine content in iodized salt and a preparation technology thereof. The reagent is made from ion exchange water, potassium iodide, starch, phosphoric acid, formamide and sodium thiosulfate. The testing reagent is prepared by potassium iodide solution, starch solution and sodium thiosulfate standard solution, and diluted by carbon dioxide-free water with various auxiliary reagents according to testing standard such as an upper limit and a lower limit of the iodine content in the iodized salt, judgment for detecting non-iodized salt, and the like, which are regulated by national standard, and then on-site testing can be carried out. The detection reagent, a weighing instrument and a reagent adding device, and like, are combined together to form a field quantitative detection kit for the iodized salt. The invention has the advantages of convenient carrying, simple testing, and is suitably applied to professional, amateur and residents.

Description

Technical field [0001] The invention provides an on-site rapid quantitative detection reagent for iodine content in iodized edible salt and a preparation process, and relates to a tool for on-site detection of iodized salt, belonging to the technical field of food safety detection. Background technique [0002] At present, the domestic and foreign on-site detection methods for the processing and sales of potassium iodate iodized edible salt are semi-quantitative colorimetry. The rapid detection kit recommended by the World Health Organization, UNICEF, and the International Council for the Control of Iodine Deficiency Diseases The maximum measurable concentration is 50 or 100mg / kg, and the accuracy is ±10mg / kg. my country's Jilin, Hebei, Hubei and other provinces have also developed semi-quantitative colorimetric plates or colorimetric methods for use, and the concentration gradients are 0, 10, 20, 30, and 40. The semi-quantitative colorimetric method mentioned above, due to the l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 张质毅刘大程马平张湘富
Owner 张质毅
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