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Download or read book Ambient air - determination of volatile organic compounds, especially ozone precursors - gas chromatography method written by and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : E. Almasi
Publisher :
ISBN 13 :
Total Pages : 17 pages
Book Rating : 4.:/5 (125 download)
Download or read book The Automated Determination of Volatile Organic Contaminants in Ambient Air And/or Soil Gas by Gas Chromatography with Selective Detectors written by E. Almasi and published by . This book was released on 1991 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volatile Organic Contaminants (VOCs) are major air pollutants in our environment. Whole air sampling has become the primary method for sampling air with EPA method TO-14. With this technique, an air sample is drawn through a cryogenically cooled trap to freeze out and concentrate VOC contaminants. The trap is then quickly heated and the VOCs are transferred to a cryogenically cooled column. Several variations and improvements have been studied: 1) automation for multiple samples, 2) use of a variable temperature absorption trap to eliminate cryogenics and a water removal device, and 3) elimination of the requirement for a cryogenically cooled oven. Two automated analytical systems are discussed: a fixed and a variable volume system. Precision, method detection limits, system linearity, and carryover are reported. Finally, ambient, dry-cleaner, and indoor air samples are analyzed using the techniques described.
![Download The Determination of Volatile Organic Compounds at the [micro]g/1 Level in Water by Gas Chromatography PDF Online Free](https://books.google.com/books/content/images/frontcover/V5fdE0ihNr0C?fife=w200-h370)
Author : Thomas A. Bellar
Publisher :
ISBN 13 :
Total Pages : 44 pages
Book Rating : 4.:/5 (31 download)
Download or read book The Determination of Volatile Organic Compounds at the [micro]g/1 Level in Water by Gas Chromatography written by Thomas A. Bellar and published by . This book was released on 1974 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : David Pekar
Publisher :
ISBN 13 :
Total Pages : 156 pages
Book Rating : 4.:/5 (88 download)
Download or read book Quantitative Method for the Determination of Polar and Oxygenated Volatile Organic Compounds in Ambient Air by Passive Sampling/solvent Desorption Combined with Gas Chromatography/mass Spectrometry written by David Pekar and published by . This book was released on 2001 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Sara Gutirrez-Sama
Publisher :
ISBN 13 :
Total Pages : 12 pages
Book Rating : 4.:/5 (125 download)
Download or read book Experimental Determination of Limits of Detection for Volatile Organic Compounds in Ambient Air Measured by Automatic Gas Chromatograph and Comparison with Reference Methods written by Sara Gutirrez-Sama and published by . This book was released on 2018 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Automatic gas chromatograph (auto-GCs) manufacturers perform an experimental method for a simple, rapid, and low-cost detection limit evaluation for volatile organic compounds in ambient air. The principle is the estimation of a minimum area of a peak. It is a relevant area value that discerns a real peak from the ground noise. This experimental limit of detection is equal to the minimum area unit multiplied by a known ratio concentration or area unit defined after calibration. Three different international methods have been compared with this experimental method: the calibration curve method issued in Europe for Monitoring Certification Scheme, the method detection limit issued during a gas chromatograph evaluation study organized by the U.S. Environmental Protection Agency, and a third international method based on an approach by the use of background noise. The exploitation of the different results concludes that this experimental method gives values in the same order of magnitude as the other methods. This experimental approach is concrete and beneficial for the improvement of auto-GCs: less ground noise, more sample volume trapped, and increase in the value area unit or mass injected.
Author : Donald Whitaker
Publisher :
ISBN 13 :
Total Pages : 100 pages
Book Rating : 4.:/5 (126 download)
Download or read book Method TO-15A written by Donald Whitaker and published by . This book was released on 2019 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 20 pages
Book Rating : 4.:/5 (319 download)
Download or read book A Method for Concentrating and Determining Trace Organic Compounds in the Atmosphere written by and published by . This book was released on 1972 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: Determination of subpart-per-billion (sub-ppb) levels of volatile organic compounds in the atmosphere by flame ionization gas chromatography requires sample sizes of at least several hundred milliters of air. Cryogenic methods of concentrating trace compounds before analysis have the disadvantage of also concentrating large amounts of water, a serious problem in gas-liquid chromatography. A simple method was developed for sample collection and concentration using porous polymer adsorbants with the unique properties of high capacity for retention of organic compounds and minimal capacity for retention of water. This technique was used to determine sub-ppb levels of volatile organic compounds in a typical rural atmosphere. Probable sources of these organic compounds were vehicle exhaust, biological processes, natural gas leaks, and industrial chemicals.
Author : British Standards Institute Staff
Publisher :
ISBN 13 : 9780580420221
Total Pages : 46 pages
Book Rating : 4.4/5 (22 download)
Download or read book Indoor, Ambient and Workplace Air. Sampling and Analysis of Volatile Organic Compounds by Sorbent Tube/Thermal Desorption/Capillary Gas Chromatography. Diffusive Sampling written by British Standards Institute Staff and published by . This book was released on 2003-06-11 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: Air, Quality, Air pollution, Environment (working), Working conditions (physical), Chemical analysis and testing, Determination of content, Volatile organic compounds, Gas analysis, Gas chromatography, Desorption, Sampling methods, Sampling equipment, Diffusion
Author : Jr., James P. Lodge
Publisher : Routledge
ISBN 13 : 1351431838
Total Pages : 792 pages
Book Rating : 4.3/5 (514 download)
Download or read book Methods of Air Sampling and Analysis written by Jr., James P. Lodge and published by Routledge. This book was released on 2017-11-22 with total page 792 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes precise directions for a long list of contaminants! All contaminants you can analyze or monitor with a given method are consolidated together to facilitate use. This book is especially valuable for indoor and outdoor air pollution control, industrial hygiene, occupational health, analytical chemists, engineers, health physicists, biologists, toxicologists, and instrument users.
Author : Colin Poole
Publisher : Elsevier
ISBN 13 : 0123855411
Total Pages : 753 pages
Book Rating : 4.1/5 (238 download)
Download or read book Gas Chromatography written by Colin Poole and published by Elsevier. This book was released on 2012-07-26 with total page 753 pages. Available in PDF, EPUB and Kindle. Book excerpt: This title provides comprehensive coverage of modern gas chromatography including theory, instrumentation, columns, and applications addressing the needs of advanced students and professional scientists in industry and government laboratories. Chapters are written by recognized experts on each topic. Each chapter offers a complete picture with respect to its topic so researchers can move straight to the information they need without reading through a lot of background information. Individual chapters written by recognized experts The big picture of gas chromatography from theory, to methods, to selected applications Provides references to other sources in associated areas of study to facilitate research Gives access to core data for practical work, comparison of results and decision making
Author : William T. Winberry
Publisher :
ISBN 13 :
Total Pages : 608 pages
Book Rating : 4.3/5 (243 download)
Download or read book Compendium of Methods for the Determination of Toxic Organic Compounds in Ambient Air written by William T. Winberry and published by . This book was released on 1988 with total page 608 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Application of Comprehensive Gas Chromatography (GCxGC) to Measurements of Volatile Organic Species in Ambient Air written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The focus of this thesis was the in-situ application of the new analytical technique "GCxGC" in both the marine and continental boundary layer, as well as in the free troposphere. Biogenic and anthropogenic VOCs were analysed and used to characterise local chemistry at the individual measurement sites. The first part of the thesis work was the characterisation of a new set of columns that was to be used later in the field. To simplify the identification, a time-of-flight mass spectrometer (TOF-MS) detector was coupled to the GCxGC. In the field the TOF-MS was substituted by a more robust and tractable flame ionisation detector (FID), which is more suitable for quantitative measurements. During the process, a variety of volatile organic compounds could be assigned to different environmental sources, e.g. plankton sources, eucalyptus forest or urban centers. In-situ measurements of biogenic and anthropogenic VOCs were conducted at the Meteorological Observatory Hohenpeissenberg (MOHP), Germany, applying a thermodesorption-GCxGC-FID system. The measured VOCs were compared to GC-MS measurements routinely conducted at the MOHP as well as to PTR-MS measurements. Furthermore, a compressed ambient air standard was measured from three different gas chromatographic instruments and the results were compared. With few exceptions, the in-situ, as well as the standard measurements, revealed good agreement between the individual instruments. Diurnal cycles were observed, with differing patterns for the biogenic and the anthropogenic compounds. The variability-lifetime relationship of compounds with atmospheric lifetimes from a few hours to a few days in presence of O3 and OH was examined. It revealed a weak but significant influence of chemistry on these short-lived VOCs at the site. The relationship was also used to estimate the average OH radical concentration during the campaign, which was compared to in-situ OH measurements (1.7 x 10^6 molecules/cm^3, 0.071 ppt) for the first.
Author : Sydney M. Gordon
Publisher :
ISBN 13 :
Total Pages : 3 pages
Book Rating : 4.:/5 (436 download)
Download or read book Analysis of Ambient Polar Volatile Organic Compounds Using Chemical Ionization-ion Trap Detector written by Sydney M. Gordon and published by . This book was released on 1990 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: The current approach to measuring trace levels of volatile organic compounds (VOCs) in ambient air requires cryogenic trapping of the analytes, followed by thermal desorption and low-temperature refocusing onto a column for analysis by capillary gas chromatography/mass spectrometry (GC/MS). The approach has been successfully applied to nonpolar VOCs, but its use for more polar species has been complicated by the problems associated with the ambient water vapor collected with the VOCs. A promising technique for measuring polar VOCs is chemical ionization GC/MS (GC/CI-MS) in the quadrupole ion trap. The approach allows whole air samples to be taken since the water present in the air is used as the CI reagent gas. Water CI leads to appreciable intensities for the proton transfer agent H3O+, which produces intense pseudomolecular ions and class-specific fragmentation patterns for various low molecular weight polar compounds. Standard mixtures of polar species at low concentrations in humidified zero air were analyzed without a membrane dryer, using a cryogenic trap and CI-GC/MS with the ion trap detector in the full scan model.
Author : National Research Council
Publisher : National Academies Press
ISBN 13 : 0309046319
Total Pages : 525 pages
Book Rating : 4.3/5 (9 download)
Download or read book Rethinking the Ozone Problem in Urban and Regional Air Pollution written by National Research Council and published by National Academies Press. This book was released on 1992-02-01 with total page 525 pages. Available in PDF, EPUB and Kindle. Book excerpt: Despite more than 20 years of regulatory efforts, concern is widespread that ozone pollution in the lower atmosphere, or troposphere, threatens the health of humans, animals, and vegetation. This book discusses how scientific information can be used to develop more effective regulations to control ozone. Rethinking the Ozone Problem in Urban and Regional Air Pollution discusses: The latest data and analysis on how tropospheric ozone is formed. How well our measurement techniques are functioning. Deficiencies in efforts to date to control the problem. Approaches to reducing ozone precursor emissions that hold the most promise. What additional research is needed. With a wealth of technical information, the book discusses atmospheric chemistry, the role of oxides of nitrogen (NOx) and volatile organic compounds (VOCs) in ozone formation, monitoring and modeling the formation and transport processes, and the potential contribution of alternative fuels to solving the tropospheric ozone problem. The committee discusses criteria for designing more effective ozone control efforts. Because of its direct bearing on decisions to be made under the Clean Air Act, this book should be of great interest to environmental advocates, industry, and the regulatory community as well as scientists, faculty, and students.
Download or read book Neutestamentliche Texte der fünften Reihe written by and published by . This book was released on 1970 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (14 download)
Download or read book Standard Test Method for Determination of the Individual Volatile Organic Compounds VOCs in Air-Dry Coatings by Gas Chromatography written by and published by . This book was released on with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Standards Association of Australia. Committee CH/19, Methods for Examination of Air
Publisher :
ISBN 13 : 9780726281495
Total Pages : 12 pages
Book Rating : 4.2/5 (814 download)
Download or read book Methods for Sampling and Analysis of Ambient Air written by Standards Association of Australia. Committee CH/19, Methods for Examination of Air and published by . This book was released on 1993 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
