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Method for measuring iodine content in multi-mineral calcium iodate

A measurement method, the technology of calcium mineral iodate, applied in the direction of color/spectral characteristic measurement, test sample preparation, etc., can solve the problems of unstable data, large difference in iodine content, large error, etc., to achieve accurate measurement results, The effect of wide application range and improved accuracy

Pending Publication Date: 2022-02-08
HUNAN DEBANG BIOLOGICAL TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has accurate analysis results for iodide in feed, such as potassium iodide, etc., but if you directly test the iodine in calcium iodate in multimineral, the error is very large, sometimes as high as 70-80%, and the data is unstable. Since the national standard method is only suitable for testing negative monovalent iodide ions, it cannot be accurately tested for iodine in iodate ions
[0005] At present, there is more and more demand for premix in the market, but the content of iodine varies greatly, and iodine is an important element for animal growth. If there is no accurate method for detecting iodine, the quality of premix will be affected.

Method used

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  • Method for measuring iodine content in multi-mineral calcium iodate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Determination of iodine content in calcium iodate by sodium thiosulfate reduction:

[0030] 1. Dissolve 0.2g of a polymine sample with known iodine content in 3ml of nitric acid (1:1 (i.e. double the volume of concentrated nitric acid)), add 0.03 g of solid sodium thiosulfate, and stir thoroughly to make the iodate in the polymine The ions are reduced to iodide ions under acidic conditions, the reduction time is 15 minutes, then filtered and transferred to a 50ml volumetric flask to constant volume, diluted with water to the mark, to be tested.

[0031] 2. Configuration of calcium iodate standard working solution

[0032] After dissolving 0.12 g of the weighed calcium iodate standard sample with 3 ml of nitric acid (1:1), add 0.03 gram of sodium thiosulfate solid, and fully stir to reduce the iodate ions in the polymine to iodide ions under acidic conditions. The reduction time was 15 minutes, then filtered and transferred to a 50ml volumetric flask to constant volume,...

Embodiment 2

[0035] 1. Dissolve 0.155g of polymineral sample with known iodine content in 3ml of hydrochloric acid (1:1), add 0.03g of solid sodium thiosulfate, stir well to reduce the iodate ion in polymineral to iodine under acidic conditions Ions, the reduction time is 15 minutes, then filtered and transferred to a 50ml volumetric flask to constant volume, diluted with water to the mark, to be tested.

[0036] 2. Configuration of calcium iodate standard working solution

[0037] After dissolving 0.108 g of the weighed calcium iodate standard sample with 3 ml of hydrochloric acid (1:1), add 0.03 gram of sodium thiosulfate solid, and fully stir to reduce the iodate ion in polymineral to iodide ion under acidic conditions, The reduction time is 15 minutes, then filtered and transferred to a 50ml volumetric flask to constant volume, diluted with water to the mark, and set aside.

[0038] 3. Accurately pipette 0ml, 0.2ml, 0.4ml, 0.6ml, 0.8ml, 1.2mL of calcium iodate standard working solutio...

Embodiment 3

[0045] 1. After dissolving 0.168g of polymineral sample with known iodine content in 3ml of hydrochloric acid (1:1), add 0.03g of thiourea solid, and stir thoroughly to reduce the iodate ion in polymineral to iodide ion under acidic conditions. The reduction time is 15 minutes, then filtered and transferred to a 50ml volumetric flask to constant volume, diluted with water to the mark, to be tested.

[0046] 2. Configuration of calcium iodate standard working solution

[0047] After dissolving 0.113g of the weighed calcium iodate standard sample with 3ml of hydrochloric acid (1:1), add 0.03g of thiourea solid, and stir fully to reduce the iodate ions in polymineral to iodide ions under acidic conditions. for 15 minutes, then filtered and transferred to a 50ml volumetric flask to constant volume, diluted with water to the mark, and set aside.

[0048] 3. Accurately pipette 0ml, 0.2ml, 0.4ml, 0.6ml, 0.8ml, 1.2mL of calcium iodate standard working solution into a 25mL volumetric ...

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Abstract

The invention belongs to the field of feed additive detection, and particularly relates to a method for measuring iodine content in multi-mineral calcium iodate, which comprises the following steps: 1) pretreatment of a sample: dissolving the sample with an acid solution, adding a sulfide reducing agent to reduce iodate ions into iodide ions, and fixing the volume to obtain a sample solution; and 2) measuring the absorbance value of the sample solution, comparing the absorbance value with a standard curve of iodate ions, and calculating and obtaining the iodine content of the sample. A drawing method of the standard curve of the iodate ions comprises the following steps: dissolving a calcium iodate standard sample with acid, adding a sulfide reducing agent to reduce the iodate ions into iodide ions, and fixing the volume; and adding a potassium carbonate solution, distilled water and a potassium thiocyanate-sodium nitrite solution, uniformly performing mixing, adding an ammonium ferric sulfate-nitric acid solution, uniformly performing mixing, keeping the constant temperature, adding a color fixing agent, performing mixing, and measuring absorbance values to obtain a standard curve of iodate ions. The measurement method is higher in accuracy.

Description

technical field [0001] The invention belongs to the field of feed additive detection, in particular to a method for measuring iodine content in polymineral calcium iodate. Background technique [0002] Multi-mineral is a uniform mixture of two or more trace element minerals and carriers or diluents prepared in a certain proportion. It mainly includes 11 kinds of trace elements such as iron, zinc, manganese, copper, cobalt, iodine, selenium, molybdenum, fluorine, chromium and boron. According to the type of feed, it can be divided into trace element premixes such as cattle, pigs, chickens, fish, etc., and can be divided into 0.1%, 1%, 4% and other trace element premixes according to the addition ratio. [0003] Potassium iodide is the most commonly used iodine additive in my country's feed industry. This is because potassium iodide is cheap and has abundant sources. However, in the feed, especially the untreated additive potassium iodide in the premixed feed is extremely u...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N1/38
CPCG01N21/31G01N1/38
Inventor 蔡春林贾瑞莲王佳亮冯一凡
Owner HUNAN DEBANG BIOLOGICAL TECH CO LTD
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