Analysis methods of the most popular carbon and su

2022-09-21
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The analysis methods of various carbon and sulfur analyzers

carbon and sulfur analyzers have a wide variety, different test and analysis principles, different application ranges, and great price differences. Now the common analysis and test methods of carbon and sulfur analyzers are summarized as follows:

1, infrared absorption method (infrared carbon and sulfur analyzer): the carbon and sulfur in the sample are oxidized into carbon dioxide and sulfur dioxide gas after high-temperature heating under oxygen enriched conditions. After treatment, the gas enters the corresponding absorption pool to absorb the corresponding infrared radiation, which is transmitted by the detector as a signal, and the computer processes and outputs the results. This method has the characteristics of accuracy, speed and high sensitivity. Both high and low carbon and sulfur contents are used. The infrared carbon and sulfur analyzer using this method has a high degree of automation and high price. It is suitable for occasions requiring high analysis accuracy

2. Conductivity method (conductivity carbon sulfur meter): This is a method to measure and analyze the content of carbon and sulfur according to the change of conductivity. The mixed gas produced by the measured sample after high-temperature combustion will change the resistivity (reciprocal of conductivity) after being absorbed by the conductivity cell, so as to measure the content of carbon and sulfur. Its characteristics are accurate, fast and sensitive. It is mostly used for the determination of low carbon and low sulfur

3. Capacity method (gas capacity carbon sulfur analyzer): commonly used methods include measuring carbon as gas capacity method, measuring sulfur as iodometric method and acid-base titration method. In particular, the gas volumetric method for measuring carbon and iodine is fast and accurate. It is the most commonly used method for the joint determination of carbon and sulfur in China. The accuracy of the carbon sulfur analyzer using this method, with the lower limit of carbon content of 0.050% and the lower limit of sulfur content of 0.005%, can meet the needs of most occasions

4. Titration (titrator): the non-aqueous titrator is used to determine carbon and sulfur elements in steel by acid-base titration. Matching with electric arc combustion furnace, it is suitable for general laboratory, pre furnace test, etc

5. Gravimetric method (carbon sulfur joint tester): commonly used alkali asbestos absorbs carbon dioxide, and the carbon content is calculated from the "increment". Sulfur is usually measured by wet method, and the sample is decomposed by acid. 1. The well cover pressure fatigue tester has the advantages of flexible and convenient operation, slow and stable loading, strong body bearing capacity, etc; Convert into sulfate, and then add barium chloride to hydrochloric acid medium to generate barium sulfate, which is precipitated, filtered, washed and burned, Weighing last "The content of sulfur is calculated by adding new plastic modified materials. The disadvantage of gravimetric method is that the analysis speed is slow, so it cannot be used for on-site carbon and sulfur analysis of enterprises. The advantage is that it has high accuracy. So far 1. before using it, we must first confirm whether the surrounding environment is safe. It is still recommended as a standard method at home and abroad, which is suitable for standard laboratories and research institutions.

6. Carbon and sulfur analyzer determines the content of carbon and sulfur in metals, There are also ICP, direct reading spectroscopy, X-ray fluorescence, mass spectrometry, chromatography, activation analysis, etc., which have their own advantages and scope of application

in China, the most widely used are: carbon sulfur joint tester, infrared carbon sulfur analyzer, gas capacity carbon sulfur analyzer, and conductivity carbon sulfur analyzer

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