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Detection method of tin content in high concentration tin hydroxide

A tin hydroxide and detection method technology, applied in the field of chemical analysis, can solve problems such as lack of tin, difficult product quality, control, etc., and achieve good reproducible results

Inactive Publication Date: 2017-02-15
GUANGZHOU KECHENG ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Recycling it with tin hydroxide by precipitation is a reasonable way of waste utilization, but the tin hydroxide product obtained by this method has a very high tin content, usually more than 30%, and lacks an accurate detection method for this tin hydroxide product The content of tin in the medium makes it difficult to control the quality of the product

Method used

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  • Detection method of tin content in high concentration tin hydroxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] S1. Completely dissolve about 0.1g of the sample to be tested in 20mL of concentrated hydrochloric acid with a mass fraction of 37.5%, heat to 90°C, stir to completely dissolve the sample to be tested, and cool to room temperature (25°C) to form tin chloride to be tested solution;

[0030] S2. Place the solution to be tested obtained in S1 on a stirrer, control the stirring speed to 100 to 200 r / min, add dilute hydrochloric acid solution equivalent to 5 times the volume of the solution to be tested, and obtain a mixed solution;

[0031] S3. Weigh about 6g of zinc powder (60 times the mass of the sample to be tested), divide it into 3 parts on average, and add it to the mixed solution of S2 in 3 times. The interval between each addition of zinc powder is 10min. The process of adding zinc powder In the process, use a glass liquid seal tube filled with saturated sodium bicarbonate solution to prevent air from entering. After the reaction is complete, heat the solution to 6...

Embodiment 2

[0036] Follow the steps of Example 1, except that in S1, heat to 80°C.

Embodiment 3

[0038] According to the steps of Example 1, the difference is that in S3, 6g of zinc powder (60 times the mass of the sample to be tested) was weighed, divided into 2 parts on average, and added to the mixed solution of S2 in 2 times.

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Abstract

The invention discloses a detection method of tin content in high concentration tin hydroxide. The method comprises the following steps: step 1, dissolving test sample completely in concentrated hydrochloric acid to form the tin tetrachloride solution to be tested, step 2, synchronously stirring and adding diluted hydrochloric acid solution with 4-6 times of volume of the test solution into the solution to be tested to obtain the mixed solution, step 3, adding zinc powder in the mixed solution for a plurality of times for reduction reaction, step 4, adding starch indicator in the clear and transparent solution prepared in step 3, using potassium iodate standard solution to conduct the titration, based on the titration results calculating the tin content in the tin hydroxide. The mass content of the tin element in the test sample is no lower than 30%. According to the detection method, the principle of reduction titration method is applied, accompanied by the control of the reducing agents and the infusion manners of the reducing agents, to achieve the complete reduction of the tin with four covalent bonds in the sample with a high tin content. Repeated tests confirm a good reproducibility of the test results.

Description

technical field [0001] The invention belongs to the field of chemical analysis, in particular to a method for detecting tin content in high-concentration tin hydroxide products. Background technique [0002] Commonly used detection methods for tin content include atomic absorption spectrophotometry, inductively coupled plasma emission spectrometry, reduction titration, etc.; but the detection limit of these methods is usually not higher than 15%; once used to measure high-content tin products , the test results have large errors and poor reproducibility. [0003] Electronic industrial wastewater contains a large amount of tin, and random discharge will pollute the environment. Recycling it with tin hydroxide by precipitation is a reasonable way of waste utilization, but the tin hydroxide product obtained by this method has a very high tin content, usually more than 30%, and lacks an accurate detection method for this tin hydroxide product The content of tin in it makes it ...

Claims

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Application Information

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IPC IPC(8): G01N31/16
CPCG01N31/16
Inventor 朱正旭覃杰荣王永成查正炯
Owner GUANGZHOU KECHENG ENVIRONMENTAL PROTECTION TECH
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