Method for detecting content of thiourea in hydrogen sulfide solution

A hydrogen sulfide and solution technology, applied in the field of chemical analysis, can solve the problems of increased iodine consumption and inaccurate measurement results, and achieve the effects of high accuracy, wide application range and good reproducibility

Active Publication Date: 2015-01-07
SHANDONG EFIRM BIOCHEMISTRY & ENVIRONMENTAL PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies in the prior art that hydrogensulfide and sulfide can react with iodine, the invention provides a method for detecting the content of thiourea in the hydrogensulfide solution. First, the hydrogensulfide solution is pretreated, and then the hydrogensulfide solution is used. The iodometric method detects the content of thiourea, which solves the problem that hydrogen sulfide and sulfide in the solution will react with iodine, which will increase the consumption of iodine, resulting in inaccurate measurement results.

Method used

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Embodiment 1

[0023] A method for detecting thiourea content in hydrogensulfide solution, the specific steps comprising:

[0024] (1) Sample weighing Accurately weigh 2.0000g of hydrogen sulfide solution with an analytical balance, and place it in a 500mL volumetric flask;

[0025] (2) Pretreatment Add distilled water to the volumetric flask described in step (1), add 10 mL of cadmium acetate solution with a mass fraction of 1.5%, make up to volume with distilled water, shake well and perform dry filtration;

[0026] (3) Detection Take the filtrate obtained in step (2) and use the iodometric method to measure the content of thiourea in the solution to be tested:

[0027] Take a clean 250ml iodine measuring bottle, add 25ml iodine standard solution and 10ml sodium hydroxide solution accurately with a pipette, shake gently and add 10ml filtrate accurately with a pipette. Plug the iodine bottle tightly with a ground stopper and seal it with water, shake it gently and place it in the dark for ...

Embodiment 2

[0032] A method for detecting thiourea content in hydrogensulfide solution, the specific steps comprising:

[0033] (1) Sample weighing Accurately weigh 5.0000g sample with an analytical balance, and place it in a 500mL volumetric flask;

[0034] (2) Pretreatment Add distilled water to the volumetric flask described in step (1), add 25 mL of zinc acetate solution with a mass fraction of 1%, make up to volume with distilled water, shake well and perform dry filtration;

[0035] (3) Detection Take the filtrate obtained in step (2) and use the iodometric method to measure the content of thiourea in the solution to be tested:

[0036] Take a clean 250ml iodine measuring bottle, add 25ml iodine standard solution and 10ml sodium hydroxide solution accurately with a pipette, shake gently and add 10ml filtrate accurately with a pipette. Plug the iodine bottle tightly with a ground stopper and seal it with water, shake it gently and place it in the dark for 10 minutes. After completi...

Embodiment 3

[0041] A method for detecting thiourea content in hydrogensulfide solution, the specific steps comprising:

[0042] (1) Sample weighing Accurately weigh 3.5000g sample with an analytical balance, and place it in a 500mL volumetric flask;

[0043] (2) Pretreatment Add distilled water to the volumetric flask described in step (1), add 17 mL of cadmium acetate solution with a mass fraction of 5%, make up to volume with distilled water, shake well and perform dry filtration;

[0044] (3) Detection Take the filtrate obtained in step (2) and use the iodometric method to measure the content of thiourea in the solution to be tested:

[0045]Take a clean 250ml iodine measuring bottle, add 25ml iodine standard solution and 10ml sodium hydroxide solution accurately with a pipette, shake gently and add 10ml filtrate accurately with a pipette. Plug the iodine bottle tightly with a ground stopper and seal it with water, shake it gently and place it in the dark for 10 minutes. After comple...

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PUM

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Abstract

The invention relates to a method for detecting content of a certain component in a mixture, and in particular relates to a method for detecting the content of thiourea in a hydrogen sulfide solution. The content of the thiourea in the hydrogen sulfide solution is detected by iodometry, and pretreatment is performed on the solution before the thiourea content is measured by the iodometry, wherein the pretreatment comprises the step of adding metal salt solution into the hydrogen sulfide solution to remove sulfhydryl groups and negative bivalent sulfur ions in the hydrogen sulfide solution. The method is high in accuracy, low in relative standard deviation, high in precision, high in reproducibility, easy, convenient and rapid to operate, low in detection cost and wide in application range and can be used for accurately measuring the thiourea content in the hydrogen sulfide solution.

Description

technical field [0001] The invention belongs to the field of chemical analysis, and relates to a method for detecting a certain component in a mixture, in particular to a method for detecting the content of thiourea in a hydrogen sulfide solution. Background technique [0002] In the process of using lime nitrogen or cyanamide as raw material to react with hydrogen sulfide to synthesize thiourea, a large amount of intermediate products such as calcium hydrogen sulfide, ammonium hydrogen sulfide, and ammonium sulfide will be generated; in order to increase the reaction rate and reduce the occurrence of side reactions, The water (mother liquor) added to the reaction system must also contain a certain amount of soluble hydrogen sulfide and sulfide such as calcium hydrogen sulfide, ammonium hydrogen sulfide, and ammonium sulfide. [0003] In order to track the change of thiourea content in the reaction solution and judge the reaction end point, it is necessary to accurately meas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/79G01N1/34
Inventor 曹斌吴文雷常忠臣吴志红张建林杨文涛高艳丽马韵升史庆苓
Owner SHANDONG EFIRM BIOCHEMISTRY & ENVIRONMENTAL PROTECTION CO LTD
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