Download or read book Thermal Desorption VOC Sampler written by and published by . This book was released on 1998 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Thermal Desorption VOC Sampler Improvements and Field Trial Performance Dover AFB written by and published by . This book was released on 1998 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A thermal desorption volatile organic compound sampler developed for the site characterization penetrometer system program was successfully field tested at Dover Air Force Base, Dover, DE. The device was evaluated as an in situ soil sampler in the vadose, capillary, and saturated zones and as a soil vapor sampler in the vadose zone. Comparisons to validation samples are made.
Download or read book Measurement of Passive Uptake Rates for Volatile Organic Compounds on Commercial Thermal Desorption Tubes and the Effect of Ozone on Sampling written by and published by . This book was released on 2013 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Diffusive or passive sampling methods using commercially filled axial-sampling thermal desorption tubes are widely used for measuring volatile organic compounds (VOCs) in air. The passive sampling method provides a robust, cost effective way to measure air quality with time-averaged concentrations spanning up to a week or more. Sampling rates for VOCs can be calculated using tube geometry and Fick's Law for ideal diffusion behavior or measured experimentally. There is evidence that uptake rates deviate from ideal and may not be constant over time. Therefore, experimentally measured sampling rates are preferred. In this project, a calibration chamber with a continuous stirred tank reactor design and constant VOC source was combined with active sampling to generate a controlled dynamic calibration environment for passive samplers. The chamber air was augmented with a continuous source of 45 VOCs ranging from pentane to diethyl phthalate representing a variety of chemical classes and physiochemical properties. Both passive and active samples were collected on commercially filled Tenax TA thermal desorption tubes over an 11-day period and used to calculate passive sampling rates. A second experiment was designed to determine the impact of ozone on passive sampling by using the calibration chamber to passively load five terpenes on a set of Tenax tubes and then exposing the tubes to different ozone environments with and without ozone scrubbers attached to the tube inlet. During the sampling rate experiment, the measured diffusive uptake was constant for up to seven days for most of the VOCs tested but deviated from linearity for some of the more volatile compounds between seven and eleven days. In the ozone experiment, both exposed and unexposed tubes showed a similar decline in terpene mass over time indicating back diffusion when uncapped tubes were transferred to a clean environment but there was no indication of significant loss by ozone reaction.
Download or read book Indoor Air written by British Standards Institution and published by . This book was released on 2021 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Indoor Ambient and Workplace Air written by International Organization for Standardization and published by . This book was released on 2000 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Standard Practice for Selection of Sorbents Sampling and Thermal Desorption Analysis Procedures for Volatile Organic Compounds in Air written by and published by . This book was released on 2003 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Tri Service Site Characterization and Analysis Penetrometer System SCAPS Validation of the Thermal Desorption Sampler for Volatile Organic Compounds written by and published by . This book was released on 1999 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volatile organic compounds (VOCs) are among the most frequently identified contaminants in soil and groundwater samples obtained during investigation of hazardous waste sites. The thermal desorption sampler (TDS), was developed for the Site Characterization and Analysis Penetrometer System (SCAPS) program to provide in situ analysis of VOCs in vadose zone and saturated soils. In operation, the TDS captures an estimated quantity of soil below ground, thermally desorbs the VOCs, and transfers them to the surface where they are analyzed on a field poflable ion trap mass spectrometer (ITMS). This analysis is sensitive to the low ppb range for chlorinated solvents and BETX compounds. The TDS was field tested at five geologically distinct sites across the country. Field data were compared to laboratory data (EPA SW-846 Method 8260B (USEPA 1995)) for validation of the technique. Data analysis indicated that the in situ analysis of the primary VOC contaminant at each site demonstrated good correlation with the validation method with a liner regression correlation coefficient between 0.8 and 1.0 and the slope of the regression line between 0.7 and 1.3. Secondary VOC contaminants of lesser concentration demonstrated poorer correlation that could be attributed to the lack of chromatographic separation prior to the ITMS analysis.
Download or read book Cost and Performance Report for Tri Service Site Characterization and Analysis Penetrometer System SCAPS Thermal Desorption Sampler for Volatile Organic Compounds written by and published by . This book was released on 2001 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The thermal desorption sampler (TDS), developed for the Site Characterization and Analysis Penetrometer System (SCAPS) program provides in situ analysis of volatile organic compounds (VOCs) in vadose zone and saturated soils. In operation, the TDS captures an estimated quantity of soil below ground, thermally desorbs the VOCs, and transfers them to the surface where they are analyzed on a field portable ion trap mass spectrometer (ITMS). This analysis is sensitive to the low ppb range for chlorinated solvents and BETX compounds. The TDS was field tested at five geologically distinct sites across the country. Field data were compared to laboratory data (US EPA SW-846 Method 8260B) for validation of the technique. Data analysis indicated that the in situ analysis of the primary VOC contaminant at each site demonstrated good correlation with the validation method with a liner regression correlation coefficient between 0.8 and 1.0 and the slope of the regression line between 0.7 and 1.3. Secondary VOC contaminants of lesser concentration, demonstrated poorer correlation that could be attributed to the lack of chromatographic separation prior to the ITMS analysis. Cost of operating the TDS system was compared to conventional sample collection and analysis techniques. The main savings produced by using this system were a reduction in time spent characterizing a site, the reduced exposure of workers to contaminants, and the minimization of investigation wastes.
Download or read book Toxicological Profile for Phenol written by and published by . This book was released on 1998 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Standard Practice for Selection of Sorbents and Pumped Sampling Thermal Desorption Analysis Procedures for Volatile Organic Compunds in Air written by and published by . This book was released on with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Indoor Air Pollution written by Peter Pluschke and published by Springer Science & Business Media. This book was released on 2004-09-27 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: Indoor Air Pollution has become a major topic in environmental research and health. Most people spend more than 80% of their time in buildings and are exposed to a broad range of pollutants from indoor sources such as building materials, furniture, carpets and textiles, heating and cooking, household and consumer products, etc. The volume provides a comprehensive review of the major indoor air pollutants: volatile organic compounds, biocides, indoor particles and fibres, combustion products and micro-organisms and their metabolites. Sources and sinks of air pollutants in indoor environments and their chemistry are distinctly different from ambient air pollution, even though the latter may influence indoor air quality. Adsorption and desorption processes, the pollutant source dynamics, gas phase reactions and kinetics - including the fate and final chemical destiny of chemically unstable intermediate compounds - are topics of scientific research as well as the evaluation of their sensory impact and irritation potential. Guidelines for assessing indoor pollution and a broad range of analytical methods have been recently developed and are reviewed by internationally renowned scientists. The specific characteristics of indoor air pollution in developing countries due to the widespread use of open fires for cooking, heating and lighting are analysed as well as the Chinese strategies to address the growing pollution problems by air pollution in its modern building stock.
Download or read book Passive Sampling Techniques in Environmental Monitoring written by Richard Greenwood and published by Elsevier. This book was released on 2007-07-03 with total page 486 pages. Available in PDF, EPUB and Kindle. Book excerpt: Monitoring pollutants in air, soil and water is a routine requirement in the workplace, and in the wider environment. Passive samplers can provide a representative picture of levels of pollutants over a period of time from days to months by measuring the average concentrations to which they have been exposed. Air monitors are widely used, for instance to measure the exposure of workers to volatile compounds, but also for monitoring the fate of pollutants in the atmosphere. Passive sampling devices are now becomining increasingly used to monitor pollutants in rivers, coastal waters and ground water where contamination results from sources such as domestic and industrial discharges, and the use of agrochemicals. Passive Sampling Techniques in Environmental Monitoring provides a timely collection of information on a set of techniques that help monitor the quality of air, surface and ground waters. Passive sampling can provide an inexpensive means of obtaining a representative picture of quality over a period of time, even where levels of pollutants fluctuate due to discontinuous discharges or seasonal application of chemicals such as pesticides. Recent changes in legislation have increased the pressure to obtain better information than that provided by classical infrequent spot sampling. Brought together in one source, this book looks at the performance of a range of devices for the passive sampling of metals, and of non-polar and polar organic chemicals in air and in water. The strengths and weaknesses and the range of applicability of the technology are considered. * Comprehensive review of passive sampling - covering air, water and majority of available technologies in one volume * Chapters written by international specialist experts * Covers theory and applications, providing background information and guidelines for use in the field
Download or read book Indoor Ambient and Workplace Air written by International Organization for Standardization and published by . This book was released on 1999 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Standard Practice for Choosing Sorbents Sampling Parameters and Thermal Desorption Analytical Conditions for Monitoring Volatile Organic Chemicals in Air written by and published by . This book was released on with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Remediation Engineering of Contaminated Soils written by Donald L. Wise and published by CRC Press. This book was released on 2000-07-25 with total page 1011 pages. Available in PDF, EPUB and Kindle. Book excerpt: Offers thorough coverage of the remediation of soils contaminated by hazardous wastes, including materials, analytical techniques, cleanup design and methodology, characterization of geomedia, monitoring of contaminants in the subsurface, and waste containment. Cites specific case studies in hydrocarbon remediation that offer a concise overview of possible technological approaches.
Download or read book Volatile Organic Compounds in Environment written by Ki-Hyun Kim and published by MDPI. This book was released on 2018-04-06 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a printed edition of the Special Issue "Volatile Organic Compounds in Environment" that was published in Environments
Download or read book Basic Multidimensional Gas Chromatography written by and published by Academic Press. This book was released on 2020-03-20 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt: Basic Multidimensional Gas Chromatography is aimed at the next generation of multidimensional gas chromatography users who will require basic training in the fundamentals of both GC and GCxGC. This book fills the current need for an inexpensive, straightforward guidebook to get new users started. It will help new users determine when to add or purchase a multidimensional system and teach them to optimize and maximize the capability of each system. Readers will also learn to select specific modes for each portion of a multidimensional analysis. This ideal resource is a concise, hard-hitting text that provides the facts needed to get users up and running. Provides a comprehensive and fundamental introduction to multidimensional gas chromatography Assists readers in determining when to add or purchase a multidimensional system Explains how a given system can be used to its maximum capacity and how users should choose specific modes for different portions of multidimensional analysis
