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Method for measuring iodine content in feedstuff

A technology for feed raw materials and iodine content, which is applied in the direction of chemical analysis by titration method, can solve the problems of unsuitable determination of calcium iodate iodine content, high operation difficulty, complicated steps, etc. Convenience and the effect of improving detection accuracy

Active Publication Date: 2018-10-12
ZHANGZHOU AONONG ANIMAL HUSBANDRY TECH +3
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Therefore, if measure the iodine content in 1% calcium iodate, 2% calcium iodate and 5% calcium iodate with this chemical industry standard method, because the sodium thiosulfate volume that it needs to consume is very little, so increased greatly Titration error affects the accuracy of the measurement results
[0004] Although the country still has standards for determining the iodine content in feed, namely "GB / T 13882-2010 Determination of Iodine in Feed - Ferric Thiocyanate-Nitrite Catalytic Kinetic Method", the method is difficult to operate and has cumbersome steps. More reagents need to be prepared, and the stability of the measurement results is poor, so it is not suitable for the determination of iodine content in 1-10% calcium iodate

Method used

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  • Method for measuring iodine content in feedstuff
  • Method for measuring iodine content in feedstuff
  • Method for measuring iodine content in feedstuff

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1 Preparation of reagents required for the test

[0035] 1.1 Sulfuric acid solution: 20% H 2 SO 4 solution;

[0036] 1.2 Ferrous sulfate solution: 50g / L FeSO 4 solution;

[0037] 1.3 Standard solution of sodium thiosulfate: c(Na 2 S 2 o 3 )≈0.1mol / L;

[0038] 1.4 Starch indicator solution: 10g / L.

[0039] 2 Preparation of samples

[0040] Take about 50g of the calcium iodate sample to be tested, put it in an airtight container, and label it.

[0041] 3 Determination of samples

[0042] Weigh 0.5-3g of calcium iodate sample (accurate to 0.0002g, wherein, 1% calcium iodate weighs about 3g, 2% calcium iodate weighs about 2g, 5% calcium iodate weighs about 1g, 10% Weigh about 0.5g of calcium iodate), put it in a 250mL beaker, add 20mL of 20% sulfuric acid solution, 20mL of water, heat and boil on an electric furnace to dissolve the sample, filter it with a medium-speed quantitative filter paper while it is hot, and dehydrate it with 30mL of hot water. Wash the f...

Embodiment 2

[0073] 1) Instruments and equipment

[0074] Analytical balance (one set accurate to 0.0001g), electric furnace (2500W), 250mL beaker, 250mL iodine measuring bottle, funnel, medium-speed quantitative filter paper, 25mL burette single channel.

[0075] 2) Environmental requirements

[0076] Room temperature: 20-25°C.

[0077] In this embodiment, the detection process of the experimental group is the same as that in Embodiment 1.

[0078] Get the 1% calcium iodate sample and divide it into multiple parts, with the improved chemical industry standard "HG / T 2418-2011 Feed Grade Calcium Iodate" as the control group 1, with the national standard "GB / T 13882-2010 Feed Iodine Determination of Ferric Thiocyanate-Nitrite Catalytic Kinetic Method" as the control group 2, with this method as the experimental group, respectively compare three methods to the determination results of the iodine content in the same batch of 1% calcium iodate samples. Wherein, in the control group 1 method,...

Embodiment 3

[0088] A method for measuring iodine content in feed materials, the method may further comprise the steps:

[0089] 1) the calcium iodate sample, H 2 SO 4 The mass percentage content is 22% sulfuric acid solution, water is heated after mixing, and is taken off after being heated to boiling. Filtrate while hot afterwards, wash, collect filtrate and washing liquid and mix, obtain test solution, wherein, the volume ratio of sulfuric acid solution and water is 1:0.9, adds 3g calcium iodate sample in every 20mL sulfuric acid solution;

[0090] 2) Add the ferrous sulfate solution whose mass volume concentration is 45g / L, and the starch indicator solution whose mass volume concentration is 12g / L into the test solution, then titrate with sodium thiosulfate standard solution until the test solution becomes Colorless, the iodine content is calculated, wherein the volume ratio of the ferrous sulfate solution to the sulfuric acid solution in step 1) is 1:10.

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Abstract

The invention relates to a method for measuring the iodine content in feedstuff. The method includes the following steps that 1) a calcium iodate sample,a sulfuric acid solution and water are mixed tobe heated,then filtration is carried out while heating,washing is carried out,filter liquid and washing liquid are collected and mixed,and to-be-measured liquid is obtained; 2) a ferrous sulfate solution and a starch indicator solution are added into the to-be-measured liquid,then a sodium thiosulfate standard solution is titrated till the to-be-measured liquid is colorless,and the iodine contentis obtained after calculation. Compared with the prior art,the method can be used for rapidly and accurately measuring the iodine content in 1%-10% calcium iodate of the feedstuff,reference data is provided for purchasing and acceptance inspection of the feedstuff,and meanwhile the method is of great significance in feed quality safety; reagents used in the measuring method is wide in source andmoderate in cost,and a measured result is good in repeatability and accurate and effective.

Description

technical field [0001] The invention belongs to the technical field of chemical component detection in feed raw materials, and relates to a method for measuring iodine content in feed raw materials. Background technique [0002] As the main component of thyroid hormone, iodine is closely related to the basic metabolism of animals and is an essential element for early growth of animals. At present, the commonly used iodine supplements in China are mainly potassium iodide and calcium iodate. Among them, potassium iodide is poor in chemical stability and easy to be damp and agglomerated, which greatly reduces its applicability; calcium iodate has good stability and is slightly soluble in Water, almost non-hygroscopic, high bioavailability and other advantages. Therefore, calcium iodate is widely used. In order to formulate feed more accurately, it is particularly important to determine the purity of calcium iodate in feed raw materials. [0003] At present, the chemical indu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16
CPCG01N31/16
Inventor 张杏莉张书金傅兴震吴海英肖俊峰傅心锋仲伟迎李品宁吴有林
Owner ZHANGZHOU AONONG ANIMAL HUSBANDRY TECH
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