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Method for determining iron content in thiourea dioxide

A technology of thiourea dioxide and a determination method, which is applied in the directions of measuring devices, preparation of test samples, color/spectral characteristic measurement, etc., can solve problems such as environmental pollution, human health hazards, and long time required, and achieve fast analysis speed, High accuracy and good reproducibility

Inactive Publication Date: 2020-04-14
濮阳圣恺环保新材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the method for measuring iron content in thiourea dioxide is to add 10mL sulfuric acid 1+1 to thiourea dioxide, and then put it on an electric furnace and evaporate it to dryness. will cause harm to the human body

Method used

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  • Method for determining iron content in thiourea dioxide
  • Method for determining iron content in thiourea dioxide
  • Method for determining iron content in thiourea dioxide

Examples

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Embodiment

[0022] A kind of assay method of iron content in thiourea dioxide, comprises the following steps:

[0023] 1) Sample treatment: Weigh 6 groups of the same thiourea dioxide samples (4 groups are used for determination of iron content, and the remaining two groups are used for determination of standard recovery), each group is about 2g of thiourea dioxide (accurate to 0.0001g), The treatment method is as follows: pour thiourea dioxide into a 100mL beaker, add a small amount of water to soak it, add 1mL hydrochloric acid 1+1 solution dropwise, then add about 50mL water to the beaker, heat with an electric furnace until the solution is clear, and continue heating to Evaporate the solution until the remaining solution volume is about 20mL, transfer it to a 100mL volumetric flask for later use;

[0024] 2) Preparation of standard solution: prepare 0.1mg / mL FeSO 4 standard solution;

[0025] 3) Determination of the maximum absorption wavelength: Take 10 mL of the iron standard solu...

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Abstract

The invention provides a method for determining the content of iron in thiourea dioxide. The method comprises the following steps: 1) pretreating a sample; 2) preparing an iron standard substance; 3),determining a highest absorption wavelength; 4), establishing an iron standard curve; and5), measuring the iron content in the thiourea dioxide. The method provided by the invention has the advantages that the color development effect is good, the iron content in the thiourea dioxide can be accurately determined, and the method has the characteristics of high analysis speed, good reproducibilityand high adding standard recovery rate.

Description

technical field [0001] The invention belongs to the technical field of thiourea dioxide, and in particular relates to a method for determining iron content in thiourea dioxide. Background technique [0002] Thiourea dioxide is widely used in chemical industry and textile industry. As a strong reducing agent, it increasingly replaces sodium hydrosulfite in the printing and dyeing field. Thiourea dioxide is obtained by the reaction of thiourea and hydrogen peroxide: add distilled water to the reaction pot, stir, and when the temperature in the pot is lowered to 8-10°C with frozen brine, start to add thiourea and drop hydrogen peroxide, control the rate of addition, and make the reaction temperature Keep below 20°C. When the pH value is above 3-5, it can be fed repeatedly. When the reaction is about to end, water can be added to stop the reaction temperature from rising. When the pH value is 2-3 and the temperature of the material drops to about 5°C, the oxidized product can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N21/78G01N1/38G01N1/44
CPCG01N21/314G01N21/78G01N1/38G01N1/44G01N2021/3155
Inventor 陈玮潘冬宋建德张金叶张乾霖赵红阳魏丽丽邢燕燕林建福
Owner 濮阳圣恺环保新材料科技股份有限公司
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