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The Company may revise and update these Terms of Use at any time without notice by posting the amended terms to the Web Site. If you do not wish to agree to these Terms of Use, do not access or use any part of the Web Site. By accessing or using the Web Site, you agree that you have read, understand and agree to be bound by these Terms of Use, as amended from time to time, as well as the Company Privacy Policy, which is hereby incorporated into these Terms of Use. Please read these Terms of Use carefully before accessing or using any part of the Web Site. All users of the Web Site are subject to the following website terms and conditions of use (these “Terms of Use”). If you are accessing the Web Site from outside the United States, Canada, or Puerto Rico, please see the appropriate international website, available at for applicable terms and conditions. These terms and conditions of use are applicable to the United States, Canada and Puerto Rico websites (“collectively the Web Site”) operated by VWR (the “Company”). Empirical molecular formulas can be determined by analysis of organic substances.Thank you for visiting our site. With the elemental analyzer, a wide range of solid or liquid organic or inorganic samples such as industry, environment, geology, food fields can be examined, especially in the chemical and pharmaceutical sectors. In the system, the oxygen analysis can be readily carried out consecutively and the quantitative determination of the five elements (CHNS / O) can be completed quickly. With the elemental analysis device within the body of ARUM, the determination of CHNS elements from samples can be done in one time and in a short time such as 8 minutes. All oxygen-containing products formed as a result of combustion are converted to carbon monoxide by the catalyst system and similarly elemental determination is made.
In the determination of the oxygen element, the sample is pyrolyzed by hydrogen-helium (H2-He) gas mixture.
This electrical signal then gives, for example, the percentage of elemental composition in proportion to the curve areas obtained in the spectrum. After the process, C, H, N, S elements are converted to CO2, H2O, N2 and SO2 gases and sent to the thermal conductivity detector to record the electrical signal proportional to the amount of each gas. Here, the gaseous sample is combusted with oxygen (O2) gas and passed through the oxidation zone followed by oxidation with suitable catalysts to fully perform the quantitative combustion process. The gaseous sample is sent to the chromatography column with an inert gas (helium, He) used as the carrier. The basic operating principle of the device is based on the burning of the sample at high temperature (≥1100º C). The elemental analyzer is a device used for quantitative determination in organic samples containing carbon, hydrogen, nitrogen, sulfur and oxygen as the basic elements of nature.