title: Determination of trace organic impurities in water using thermal desorption from XAD resin.
abstract: A small water sample (20 to 250 ml) is passed through a small tube containing XAD-4 resin; this effectively retains the organic impurities present in the water. This tube is connected to the permanent apparatus and the sorbed organics are thermally transferred to a small Tenex pre-column while the water vapor is vented. The pre-column is closed off, preheated to 275--280 degrees C, and then a valve is opened to plug-inject the vaporized sample into a gas chromatography. The procedure works well for a variety of model organic compounds added to the water and can be used for the analysis of actual water samples.
mesh_terms: D000327:Adsorption; D006358:Hot Temperature; D006838:Hydrocarbons / Q000032:analysis; D007659:Ketones / Q000032:analysis; D012117:Resins, Synthetic; D014873:Water Pollutants / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D006838:Hydrocarbons; D007659:Ketones; D012117:Resins, Synthetic; D014873:Water Pollutants; D014874:Water Pollutants, Chemical