Detection method for sulfur content in sulfur cream

A detection method and technology for sulfur content, applied in the direction of chemical analysis by titration, can solve the problems of low efficiency, easy volatility and high risk, and achieve the effects of convenient operation, improved cleanliness and low operating cost

Inactive Publication Date: 2016-09-21
SHANDONG IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, carbon disulfide is extremely volatile and has strong irritation and corrosion effects on the skin and mucous membranes. It is very dangerous and has great safety mana...

Method used

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  • Detection method for sulfur content in sulfur cream

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] First, sample the sulfur paste to be detected, then dry the sample, weigh the dry sample to 0.1031g, then put the sample into a flask, then add 50mL of alcohol to the flask, then add 80mL of distilled water, then add 10g of sodium sulfite, and then heat back to Distill until all the samples in the flask are dissolved, then add distilled water to make up to 250mL, draw 50ml into a 250mL Erlenmeyer flask, add 10mL of formaldehyde, 20mL of 10% acetic acid, 4 drops of starch indicator, and titrate with 0.1mol / L iodine standard solution , the volume of iodine standard solution consumed is 5.75mL.

[0037] Sulfur content calculation: 0.1mol / L×5.75mL×32g / mol×5×100%÷0.1031g÷1000=89.23%.

Embodiment 2

[0038] Embodiment 2 precision and accuracy experiment

[0039] Precision refers to the degree to which the results of repeated measurements under the same conditions are consistent with each other. The size of the precision is expressed by the relative standard deviation. The smaller the deviation, the higher the precision.

[0040] Adopt analytically pure sulfur powder to add sand preparation standard concentration to be the sample of 96%, adopt method provided by the invention then to the same sample parallel measurement of the sample of above-mentioned standard concentration 5 times, then calculate the relative standard deviation of measurement result, The results are described in Table 1.

[0041] The detection result of table 1 embodiment of the present invention precision and accuracy

[0042]

[0043] From the above test results, the accuracy and accuracy of the method are good.

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Abstract

The invention provides a method for detecting sulfur content in sulfur paste. First, the sulfur paste to be detected is sampled, then the sample is dried, and then the sample is weighed. Then, the sample is put into a flask, and then distilled water is added to the flask, and then Then add excess sodium sulfite, then heat and distill until all the samples in the flask are dissolved, then add formaldehyde, acetic acid and starch indicator to the sample solution, then titrate with iodine standard solution, and then calculate sulfur according to the consumed volume of iodine standard solution The sulfur content in the paste; the detection method can not only effectively avoid the use and generation of toxic drugs, but also greatly improve the work efficiency; and the principle is simple, the operation is convenient, and the operation cost is low, so it is worthy of popularization and promotion.

Description

technical field [0001] The invention relates to the technical field of chemical detection, in particular to a method for detecting sulfur content in sulfur paste. Background technique [0002] In the chemical industry, especially the coking industry, the gas desulfurization process will produce a large amount of sulfur paste, which can be used to make sulfuric acid and other chemical products. The accurate measurement of sulfur content in sulfur paste is related to the calculation of sulfur balance in the whole coking system. In the traditional detection method, the detection of sulfur content must use carbon disulfide to wash the sample. However, carbon disulfide is extremely volatile and has strong irritation and corrosion effects on the skin and mucous membranes. It is very dangerous and has great safety management risks. It is not suitable for frequent use in enterprise laboratories. Moreover, the traditional analysis method needs nearly an hour for each inspection, wh...

Claims

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Application Information

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IPC IPC(8): G01N31/16
CPCG01N31/16
Inventor 汪娟许明牛爱宁权向科杨繁李超张敏
Owner SHANDONG IRON & STEEL CO LTD
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