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Quantitative analysis method for measuring sulfur in organic thiosulfate

A thiosulfate, quantitative analysis technology, applied in the field of testing and analysis, can solve the problems of complex treatment process, low absolute sulfur content, many interference factors, etc., to achieve good repeatability, less interference factors, and less environmental pollution.

Active Publication Date: 2016-02-17
BEIJING RED AVENUE INNOVA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are many methods for determining sulfur, most of them have their own limitations. For example, the titration method is time-consuming and the measurement range is narrow; although the infrared method is simple and fast, it is difficult to determine the sulfur in inorganic substances, and the absolute sulfur content that can be determined Low; spectrophotometry is time-consuming and complex, and is suitable for the determination of low-content samples; X-ray fluorescence spectroscopy, inductively coupled plasma atomic emission spectroscopy and inductive coupling, etc., have many interference factors, such as when using ICP-MS. 16 o 16 o + , 14 N 18 o + , 15 N 17 o+, 14 N 17 o 1 h + A variety of polyatomic ions can form interference
Due to complex techniques such as spectral line selection, background correction and spectral interference, the application of these methods in routine analysis is limited.

Method used

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  • Quantitative analysis method for measuring sulfur in organic thiosulfate
  • Quantitative analysis method for measuring sulfur in organic thiosulfate
  • Quantitative analysis method for measuring sulfur in organic thiosulfate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Step 1: Drawing of standard curve

[0051] Accurately weigh 19.39g sodium thiosulfate (Na 2 S 2 o 3 ·5H 2O) In a beaker, add water to make it all dissolve, set the volume in a 100mL volumetric flask, and prepare a solution (50g / L); accurately measure the above solution in different volumes (0.0, 2.0, 4.0, 6.0, 8.0, 10.0) Put it in a 50mL volumetric flask, and then dilute it into 6 kinds of standard solutions with different concentrations; scan the standard solution with representative CS lines (257.594nm, 257.961nm and 258.056nm), and adjust the flame height and combustion ratio Finally, select the flame height as: 13mm; air flow: 110L / h; fuel-assist ratio: 0.274, and the absorption line with the maximum absorbance value: 257.594nm. Measure the absorbance of standard solutions with different concentrations at the maximum absorption line 257.594nm, and draw a standard curve.

[0052] Table 1 Drawing of standard curve

[0053] Draw the volume of sulfur stan...

Embodiment 2

[0085] Step 1: Preparation of Sulfur Standard Curve

[0086] Accurately weigh 19.39g sodium thiosulfate (Na 2 S 2 o 3 ·5H 2 O) In a beaker, add water to make it all dissolve, set the volume in a 100mL volumetric flask, and prepare a solution (50g / L); accurately measure the above solution in different volumes (0.0, 2.0, 4.0, 6.0, 8.0, 10.0) Put it in a 50mL volumetric flask, and then prepare standard solutions with different concentrations of 0-10g / L; use representative CS spectral lines (257.594nm, 257.961nm and 258.056nm) to scan the standard solution of the maximum sulfur concentration, and conduct a flame comparison Adjust the height and fuel-assist ratio, finally select the flame height: 13mm; Measure the absorbance of standard solutions with different concentrations at the maximum absorption line 257.594nm, and draw a standard curve.

[0087] Table 3 Drawing of Standard Curve

[0088] Draw the volume of sulfur standard solution (mL)

Sulfur standard curv...

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Abstract

The invention aims at providing an analysis method for measuring the content of sulfur in organic thiosulfate through a continuous light source atomic absorption spectrometer (CS-AAS). The method is easy to implement, and an analysis result is high in accuracy and small in error. The method comprises the specific steps that sodium thiosulfate is selected as a standard substance and directly dissolved in water to prepare standard solutions with different concentrations, a proper combustion supporting ratio, a proper flame height and the maximum absorption spectrum line are selected through the CS-AAS, and a standard curve is drawn; organic thiosulfate is directly dissolved in water, and the content of sulfur in organic thiosulfate is measured with the combination of the standard curve.

Description

technical field [0001] The invention belongs to the field of testing and analysis, in particular to a quantitative analysis method for sulfur content in organic thiosulfates. Background technique [0002] Sulfur is an important basic element of human beings, animals and plants, mainly in the form of proteins and enzymes. Sulfur is ubiquitous and exists in different forms in the earth's crust. It is the 15th most abundant element in the earth's crust, with a sulfur content of about 0.048%, and is used in many fields of science and technology. [0003] With the development of the rubber tire industry, the research and production of rubber additives have attracted more and more attention. Sulfur-containing processing aids play a very important role in the rubber vulcanization process. Monsanto Corporation of the United States initially developed DuralinkHTS in the 1980s to improve the stability of polysulfide crosslinks. DuralinkHTS contains sulfur atoms and carbon atoms. Du...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/33
CPCG01N21/33
Inventor 胡小娜李秋荣甄博鸣赵丽丽刘哲董栋
Owner BEIJING RED AVENUE INNOVA
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