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for data collection. This data system also employs <br /> Incos r.omputer language. A model 10 Perkin Elmer <br /> nine-track tape drive is used for long term data <br /> storage. The GCMS instrument can be configured in <br /> capillary or Packed column modes. <br /> c. Two stand-alone Incos data systems provide extended <br /> data-handling and record-keeping capabilities. <br /> These systems consist of Nova 4C computers with 10 <br /> megabyte Wanco and 35 megabyte Winchester disk <br /> drives, respectively. <br /> 3. Gas Chromatographs <br /> Selective detector gas chromatography is employed to <br /> solve a variety of analytical problems in which <br /> components of a general chemical class are to be <br /> distinguished from background materials not having the <br /> class-specific properties;. The 12 gas chromatographs <br /> currently in use are equipped with a wide variety of <br /> detectors, including the following: <br /> a. Flame ionization detector. Nonselective, used for <br /> fuel fingerprinting and odor pattern matching. <br /> b. Thermal conductivity detector. Nonselective, used <br /> for the analysis of methane, carbon dioxide, and <br /> I other gases. <br /> C. Electron _`apture detector. Moderately selective <br /> i for electron capturing components such as organo- <br /> chlorine pesticides, PCA, and phthalates. <br /> d. Flame Photometric Detector. Selective for phospho- <br /> rus or sulfur-containing organics such as organo- <br /> phosphorus pesticides or sulfur gases. <br /> e. Hall detector. When operated in the halogen mode, <br /> highly selective for compounds such as trihalo- <br /> methanes and chlorinated solvents. It can also be <br /> operated in sulfur-selective mode. <br /> f. Photoicnization detector. Selective for. photoioni- <br /> sable components such as aromatic solvents, esters <br /> and unsaturates. <br /> y. Thermionic selective detector. Selective for <br /> nitrogen- and phosphorus-containing organics such <br /> as organophosphorus pesticides and amines. <br /> Iv-2 <br />