Various carbon* analytical instrument methods summarized and summarized

There are many kinds of carbon-sulfur analyzers and the principle of laboratory analysis is not the same. The scope of application is also different. The price difference is also very large. The following are several commonly used analysis methods for carbon-sulfur analyzers:

Infrared Absorption Method (Infrared Carbon and 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 accurate, rapid, high sensitivity, high and low carbon and sulfur content are used, using this method of infrared carbon and sulfur analyzer, a higher degree of automation, the price is relatively high, suitable for applications with high analytical accuracy requirements.

Conductivity method (conductivity carbon-sulfur instrument): This is a method of measuring and analyzing the carbon and sulfur content based on the change in conductivity. After the measured sample is subjected to high-temperature combustion, the mixed gas is absorbed by the conductivity cell and the resistivity (conductivity) The reciprocal of () has been changed to determine the content of carbon and sulfur, which is characterized by accuracy, speed, and sensitivity. Mostly used for low carbon, low sulfur determination.

Gravimetric method (carbon-sulfur combined analyzer): Alkaline 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.

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

Volumetric method (gas-capacity carbon-sulfur instrument): The commonly used carbon measurement method is the gas volumetric method, and the sulfur measurement is iodometric method and acid-base titration method. In particular, the gas volumetric method to measure carbon and iodine content is the most rapid and accurate method 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 0.050% and sulfur content. The lower limit is 0.005%. The HXE series carbon and sulfur analyzer manufactured by Hua Hin can meet the needs of most occasions.

The determination of carbon and sulfur contents in metals includes the ICP method, direct reading spectroscopy, X-ray fluorescence spectroscopy, mass spectrometry, chromatography, activation analysis, and the like, each having its own advantages and application ranges. In China, the most widely used are: carbon-sulfur combined analyzer, infrared carbon-sulfur analyzer, gas-capacity carbon-sulfur analyzer, conductivity carbon-sulfur instrument.