Selective Gas Chromatographic Detection of Vapor-Phase Organics in Ambient Air PDF Download
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Author: JW. Bozzelli
Publisher:
ISBN:
Category : Air
Languages : en
Pages : 10
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Book Description
High-resolution capillary-column gas chromatography (GC) efficiently separates the many organic compounds that exist in ambient air. However, the identification of these compounds by retention times alone is difficult. The response ratios of sample components on several different types of GC detectors can be used to identify selected peaks more positively. Electron capture (ECD), photoionization (PID), and flame ionization (FID) detectors have been evaluated in this study. Samples split between an ECD and FID are readily analyzed for such electron-capturing species as carbon tetrachloride and tetrachloroethylene. Replicate samples are run on a PID for identification of peaks due to aromatic compounds and other unsaturated materials. This system of three detectors gives sufficient information to confirm the identity of the compounds that have been chosen for quantitation.
Author: JW. Bozzelli
Publisher:
ISBN:
Category : Air
Languages : en
Pages : 10
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Book Description
High-resolution capillary-column gas chromatography (GC) efficiently separates the many organic compounds that exist in ambient air. However, the identification of these compounds by retention times alone is difficult. The response ratios of sample components on several different types of GC detectors can be used to identify selected peaks more positively. Electron capture (ECD), photoionization (PID), and flame ionization (FID) detectors have been evaluated in this study. Samples split between an ECD and FID are readily analyzed for such electron-capturing species as carbon tetrachloride and tetrachloroethylene. Replicate samples are run on a PID for identification of peaks due to aromatic compounds and other unsaturated materials. This system of three detectors gives sufficient information to confirm the identity of the compounds that have been chosen for quantitation.
Author: Sievers RE.
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Gas Chromatographic and Mass Spectrometric Analysis of Volatile Organics in the Atmosphere; Organics in Air, Sampling and Identification; Polyurethane Foam and Selected Sorbents as Collection Media for Airborne Pesticides and Polychlorinated Biphenyls; OSHA's Wipe Sampling Policies and Procedures; Measurement of Contamination from PCB Sources; Selective Gas Chromatographic Detection of Vapor Phase Organics in Ambient Air; Nitrosamine Air Sampling Using a New Artifact-Resistant Solid Sorbent System; Chemical Analysis of Diesel Particulate Matter and an Evaluation of Artifact Formation; Analysis of Organic, Elemental, and Carbonate Carbon in Ambient Aerosols; Origin of Carbonaceous Species in the Atmosphere Deduced by Radiocarbon; Laser Techniques for Analysis of Ambient Air; An Overview of the Use of Short Term Bioassays in Evaluation of Atmospheric Pollutants; Biological Exposure Sensors in Coal Conversion Technologies; Correlation of Air Concentrations and Biological Data; Sampling Rates and Other Considerations for Selected Passive Air Sampling Techniques; Calibration Techniques.
Author: S. S. Verner
Publisher: ASTM International
ISBN: 9780803106048
Category : Medical
Languages : en
Pages : 208
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Book Description
Author: V.G. Berezkin
Publisher: Elsevier
ISBN: 0080858562
Category : Science
Languages : en
Pages : 225
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Book Description
Air pollution determination is one of the most important fields of gas chromatography application in practice. This book provides a systematic description of the main stages of air pollution determination, ranging from sampling problems to the quantitative estimation of the acquired data. Special attention is paid to the problem of gas, vapor, spray and solid particles extraction from air. The main methods of sampling procedure, namely, container utilization, cryogenic concentration, absorption, adsorption, chemisorption and filter usage, and successive impurities extraction are also handled. Sorption theory and the problems of sorption and desorption efficiency for hazardous impurities being extracted from traps with sorbents are discussed in detail. The practical utilization of different sorbents (silica, activated carbon, polymers etc.) to carry out sampling procedures for 200 main pollutants with known TLV (USSR and USA) is also considered. This highly informative book, reflecting several insufficiently known techniques as well as the experience of both western and Soviet researchers, should be of interest to both beginners and skilled researchers.
Author: Stephen Shap Chow Tong
Publisher:
ISBN:
Category : Gas chromatography
Languages : en
Pages : 198
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Book Description
Author: Karen D. Oliver
Publisher:
ISBN:
Category : Organic compounds
Languages : en
Pages : 23
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Book Description
Author: Andrew James Grall
Publisher:
ISBN:
Category :
Languages : en
Pages : 312
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Book Description
Author:
Publisher:
ISBN:
Category : Air
Languages : en
Pages : 208
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Book Description
Author: E. Almasi
Publisher:
ISBN:
Category : Air
Languages : en
Pages : 17
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Book Description
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.
Author: Yong-jin Shen
Publisher:
ISBN:
Category : Air
Languages : en
Pages : 116
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Book Description
