Elemental analyzer elementaryanalyzer
An automated instrument for analyzing organic elements. Equipped with a microcomputer and a microprocessor for condition control and data processing, the method is simple and rapid.
There are four methods for the determination of carbon, hydrogen and nitrogen analyzers: 1 differential thermal conductivity method. Also known as self-integration thermal conductivity method. The combustion part of the sample is analyzed by carbon, hydrogen and nitrogen for quantitative analysis of organic elements. When decomposing the sample, a certain amount of oxygen is assisted, and the helium is used as the carrier gas, and the combustion gas is carried through the combustion tube and the reduction tube, and the second tube is respectively filled with the oxidant and the reduced copper, and the silver wire is filled to remove the interference (for example) Halogen, etc.), after the zui gas from the reduction tube (carbon dioxide, water and nitrogen except for helium) is mixed into a certain volume of the container, and then carried by the carrier gas into the absorption tube containing magnesium perchlorate In order to remove water. There is a thermal conductivity detector before and after the absorption tube, and the water content is given by the difference between the two response signals. The moisture-removing gas is then introduced into the caustic soda wool absorption tube, and the carbon dioxide content is determined from the difference between the heat-conductive cell signals before and after the absorption tube. A group of thermal conductivity cells after zui measures the difference between the pure helium gas and the nitrogen-containing carrier gas signal, and proposes the nitrogen content. 2 reaction gas chromatography. The elemental analyzer consists of a combustion part and a gas chromatograph. The combustion device is similar to the above, and the combustion gas is loaded into a gas chromatograph column filled with polystyrene polymer beads by helium gas, and is separated into nitrogen, carbon dioxide, and water. For each chromatographic peak, the area of ​​each peak is obtained by an integrator. The conversion factor of the three elements is obtained from a standard sample of known carbon, hydrogen, and nitrogen contents, and the content of each element of the unknown sample can be obtained. 3 electricity method. Also known as Coulomb analysis. 4 conductance method. The latter two methods can only measure carbon and hydrogen at the same time, and their application is not as extensive as the former two methods.
Oxygen and Sulfur Analyzers Modern instruments for measuring carbon, hydrogen, and nitrogen can be used to measure oxygen and sulfur after switching to a pyrolysis tube. The sample is pyrolyzed in a high temperature tube, and the pyrolysis product is carried by helium into a packed bed of activated carbon (coated with nickel or platinum) to completely oxidize oxygen to carbon monoxide, and the mixed gas is separated by a molecular sieve column to separate the components. The pilot cell detects carbon monoxide to determine the oxygen content. Alternatively, the pyrolysis gas is passed through a copper oxide column to oxidize carbon monoxide to carbon dioxide, which is then subjected to differential thermal conductivity measurement using caustic soda asbestos absorption. Sulfur is measured by filling an oxidant such as tungsten oxide in a pyrolysis tube, and introducing oxygen to promote oxidation to oxidize sulfur to sulfur dioxide. This sulfur dioxide can be measured by gas chromatography through a molecular sieve column or by a differential thermal conductivity method through a silver oxide absorber tube.
The halogen analyzer halogen-containing sample is decomposed and decomposed to generate halogen ions, which are commonly measured by coulometric titration. It can also be measured by ion-selective electrode; or it can be used as a measuring electrode to directly read the potential value, which is obtained from the known potential-concentration relationship. Content; or use it as the indicator electrode, titrate with silver nitrate standard solution, titrate to the pre-adjusted potential value, it will stop automatically, and calculate the halogen content from the standard solution volume consumed.
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