Because the sulfur content in steel is determined by the carbon-sulfur element analyzer combustion method, sulfur cannot be completely converted into sulfur dioxide, and its conversion rate is related to the test conditions. Therefore, the sulfur content in the sample cannot be calculated directly from the theoretical value based on the concentration of the standard solution. The standard sample can be used to determine the sulfur titer under the same conditions as the measurement sample, and then the sulfur content of the sample can be calculated. Therefore, the selection of standard samples of sulfur is extremely important. When determining the sulfur with the carbon-sulfur analyzer combustion method, the statutory value must be selected by the gravimetric method, reduction-colorimetric method or original potential titration. The standard sample with similar grade and similar content is used to determine the titration and then the sample content sulfur content . The test results of carbon steel or pig iron standard samples that have been stored for a long time (such as those over 10 years) may have serious deviations, and must be re-defined before they can be used. After using the standard sample, cover it in time and put it in a desiccator to prevent the standard sample from being exposed to atmospheric carbon dioxide, sulfur dioxide, hydrogen oxide, dust, organic matter, etc., which will adsorb to its surface and affect the standard value of the standard sample. When measuring samples with a sulfur content of less than 0.010%, GB223.2-1981 introduces that a standard sample of 0.1000g and a sulfur content of more than 0.10% and a standard sample of 0.9000g and a sulfur content of less than 0.001% are mixed and calibrated. The blank value should include the blank value generated by the porcelain boat, porcelain cover, flux and standard sample with 0.9g and sulfur content less than 0.001%. The sample weighed 1.000g.
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How to choose the standard sample when determining the sulfur in iron and steel by the combustion method of carbon and sulfur analyzer