Several commonly used analysis methods for carbon* analyzers

1. Infrared absorption method (infrared carbon-sulfur analyzer): The carbon and sulfur in the sample are heated at high temperatures under oxygen-rich conditions and oxidized to carbon dioxide and sulfur dioxide gas. After the gas is processed into the corresponding absorption tank, the corresponding infrared radiation is absorbed, transmitted by the detector as a signal, and the output is processed by a computer. This method has the characteristics of accuracy, rapidity, and high sensitivity. Both the high and low carbon and sulfur contents are used. The infrared carbon and sulfur analyzer using this method has a higher degree of automation and a higher price.

2. Conductance method (conductivity carbon-sulfur instrument): This is a method of measuring and analyzing the carbon and sulfur content according to the change of conductivity. The mixed gas produced after the sample is subjected to high-temperature combustion is absorbed by the conductivity cell and then the resistivity. The reciprocal of the conductivity changes to determine the content of carbon and sulfur, which is characterized by accuracy, speed, and sensitivity. Mostly used for low carbon, low sulfur determination.

3, the volume method (gas capacity carbon-sulfur instrument): Commonly used carbon measuring gas volume method, measuring sulfur for the iodometric method, acid-base titration method. In particular, the gas volumetric method to measure carbon and iodine content are the most rapid and accurate methods for carbon and sulfur determination in China. The accuracy of carbon and sulfur analyzers using this method has a lower limit of carbon content of 0.030% and sulfur content. The lower limit is 0.005%, which can meet the needs of most occasions.

4. Titration (titrator): The non-aqueous titrator is used for the determination of carbon and sulfur in steel by acid-base titration. Matched with arc burners, it is suitable for use in general labs and furnaces.

5. Gravimetric method (carbon-sulfur combined analyzer): The basic asbestos is used to absorb carbon dioxide, and the carbon content is determined by "incremental". Determination of sulfur commonly used wet method, the sample with acid decomposition oxidation, converted to sulfate, and then in the hydrochloric acid medium was added cesium chloride, barium sulfate generated by precipitation, filtration, washing, burning, weighing the final calculation of sulfur The content. The disadvantage of the gravimetric method is that the analysis speed is slow, so it is impossible to use the carbon and sulfur analysis at the enterprise site. The advantage is that it has a high degree of accuracy. It is still recommended as a standard method at home and abroad and is applicable to standard laboratories and research institutes.

6, Determination of carbon in the metal, sulfur content, as well as ICP, direct reading spectrometry, X-ray fluorescence, mass spectrometry, chromatography, activation analysis, etc., have their own advantages and scope of application.