Antek Instruments

The NO + 03 chemiluminescent reaction [Reactions (1-3)] is utilized in two commercially available GC detectors, the TEA detector, manufactured by Thermal Electric Corporation (Saddle Brook, NJ), and two nitrogen-selective detectors, manufactured by Thermal Electric Corporation and Antek Instruments, respectively. The TEA detector provides a highly sensitive and selective means of analyzing samples for A-nitrosamines, many of which are known carcinogens. These compounds can be found in such diverse matrices as foods, cosmetics, tobacco products, and environmental samples of soil and water. The TEA detector can also be used to quantify nitroaromatics. This class of compounds includes many explosives and various reactive intermediates used in the chemical industry [121]. Several nitroaromatics are known carcinogens, and are found as environmental contaminants. They have been repeatedly identified in organic aerosol particles, formed from the reaction of polycyclic aromatic hydrocarbons with atmospheric nitric acid at the particle surface [122-124], The TEA detector is extremely selective, which aids analyses in complex matrices, but also severely limits the number of potential applications for the detector [125-127],... 

Antek Instruments, Inc., 98 Bowling Green State University, 234 Da-Ych Institute of Technology, 53 David Michael Company, Inc.. 29 Pood Industry Research and Development Institute, 160... 

Antek Instruments/PAC, 300 Bammel Westfield Road, Houston, TX 77090. 

FIGURE 13.39 Comparison of chemiluminescence detector response with an FID on a heavy diesel sample and a regular unleaded gasoline sample. (Reproduced with permission from Reference 106, ANTEK Instruments, Inc.)... 

The HPLC system, an Alliance 2790, with thermostatted autosampler and divert valve LabPro, UV detector 2487 and satin interface, and ZQ mass spectrometer with ESI interface, were products of Waters Inc., Milford, Massachusetts. The chemiluminescent nitrogen detector (CLND) model 8060 was a product of ANTEK Instruments Inc., Houston, Texas. The liquid handler Miniprep 75 was a product of Tecan Group Ltd., Maennedorf, Switzerland. 

The apparatus described in (4.1 through 4.11) is manufactured in several variations by the Antek Instruments Inc. of Houston, TX and Dohrmann Division, Xertex Corp, of Santa Clara, CA. Both have been found to meet all essential requirements. 

Apparatus manu ctufed in several variations by Antek Instruments, Inc., Houston, TX has been found suitable for this purpose. 

Figure 12.13—Nitrogen and sulphur analyser. Model 7000NS, reproduced by permission of Antek. This instrument includes two techniques of luminescence nitrogen is measured by chemiluminescence (see Fig. 12.12) and sulphur by fluorescence of S02 (UV excitation).

Figure 11.17 Analyser of sulfur and nitrogen. Model 9000NS reproduced courtesy of Antek. This instrument combines two luminescence techniques nitrogen is measured by chemiluminescence of NO (see Figure 11.15) while the sulfur is measured by fluorescence of SOj (UV excitation).

Validation criteria for the HSS instruments included meeting or smpassing the performance established by the standard Antek on-line analyzers (6000/6200 series). Where possible, comparisons were also made to D 5453 lab instrumentation results. Due to the large number of... 

Other miscellaneous instrumentation used in this scheme of complete coal analysis include Phillips PW-1212 X-ray Fluorescence analyzer for sulfur, Antek-771 chemiluminescent analyzer for nitrogen, and Texas Nuclear 9500 14-MeV neutron generator for oxygen. 

For HTCO analysis, manufacturers offer various combinations of instruments. Since it is difficult if not impossible to draw up an exhaustive list of all commercially available and laboratory-made apparatus, we only mention, with one example each, a few of the most frequently used configurations. Some instruments (e.g.. Ionics) use a combination of high temperature (900 °C) and pure platinum as catalyst. Others (e.g., Shimadzu), use platinised alumina catalysts at lower temperature (680 C). Analytik Jena sells an instrument working with a CuO catalyst at 950 °C. Antek produces a total nitrogen analyser based on the same principle (900 °C, on silica beads). The combination used by Sugimura and Suzuki (1988) which triggered the controversy on DOC concentrations was close to the Shimadzu design. The sample was injected vertically into a furnace filled with 3 % Pt on aluminium oxide, at 680 °C. 

The sole source of supply of the apparatus for Instrument 1. Antek Model 7000 known to the committee at this time ts Antek Instrumerrts, bw.. Houston. TX. 

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