atmospheric carbonyls Articles

  • High-Purity DNPH Standards for Monitoring of Atmospheric Carbonyls

    Analysts monitoring for atmospheric carbonyls follow prescribed methods published by the US Environmental Protection Agency, the California Air Resource Board, and the American Society for Testing and Materials (ASTM®). These methods call for trapping carbonyls on an adsorbent coated with dinitrophenylhydrazine (DNPH). Sigma Aldrich offers more than fifty 2,4-DNPH carbonyl derivative ...

    By MilliporeSigma

  • Sampling of Carbonyls Using a Dual-Layer LpDNPH Glass Sampling Tube and HPLC Analysis

    The dual-layer LpDNPH sorbent tube is an air sampling device designed for sampling carbonyls (e.g. formaldehyde) in ambient, indoor, and industrial atmospheres. Carbonyls are trapped on our high-purity silica gel adsorbent coated with 2,4-dinitrophenylhydrazine (2,4-DNPH) where they are converted to stable hydrazone derivatives. The derivatives are eluted from the tube in acetonitrile and ...

    By MilliporeSigma

  • Reactivity of n-butane in the formation of photochemical smog in Mexico City

    The formation of high concentrations of contaminants in Mexico City's atmosphere due to the vehicular transit constitutes an acute problem. Based on that, and before alternative fuels are proposed for clean use, it is widely justified to evaluate the environmental impact these may have as a source of pollution. As the liquefied petroleum gas mix used as a domestic fuel has been proposed ...

    By Inderscience Publishers

  • Two Detector Solution to Analyzing Sulfur

    Sulfur compounds are reactive, corrosive to pipes, and destructive to catalysts in petroleum refineries. Sulfur emission are strictly regulated globally. When released into the atmosphere sulfur dioxide converts to sulfuric acid resulting in adverse effects on human health and the environment. Sulfur detection is found useful in many other industries; therefore, detection of sulfur compounds in ...

    By Restek Corporation

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