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Showing 1-30 of 33 results for "10199" within Papers
Performance catalytic ozonation over the carbosieve in the removal of toluene from waste air stream.
Mohammad Reza Samarghandi et al.
Journal of research in health sciences, 14(3), 227-232 (2014-09-12)
Toluene is a volatile organic compound, one of 189 hazardous air pollutants (HAPs) and the most important pollutant found in most industries and indoor environments; owing to its adverse health, toluene must be treated before being released into the environment.
Thomas R Rybolt et al.
Journal of colloid and interface science, 296(1), 41-50 (2005-09-20)
Gas-solid chromatography was used to obtain second gas-solid virial coefficients, B2s, in the temperature range 342-613 K for methane, ethane, propane, butane, 2-methylpropane, chloromethane, chlorodifluoromethane, dichloromethane, and dichlorodifluoromethane. The adsorbent used was Carbosieve S-III (Supelco), a carbon powder with fairly
L H Wartelle et al.
Journal of chromatography. A, 879(2), 169-175 (2000-07-13)
Granular activated carbons (GACs) made from agricultural by-products were investigated as adsorbents for short path thermal desorption gas chromatographic analysis of selected polar and nonpolar organic compounds. GACs made from macadamia nut, black walnut and hazelnut shells were compared to
John L Martin et al.
Journal of occupational and environmental hygiene, 1(6), 363-370 (2004-07-09)
In an effort to assess the scope of occupational exposures to ethylene, the Olefins Panel of the American Chemistry Council designed and conducted a research project to develop and apply a sampling and analytical method to measure workplace exposure. The
R A Hallama et al.
Journal of chromatography. A, 809(1-2), 47-63 (1998-07-25)
The application of a newly developed thermal desorption method for the analysis of workplace air to the analysis of polar compounds is reported. The method was validated for both pumped and diffusive sampling of test gases containing polar volatile organic
R A Borders et al.
American Industrial Hygiene Association journal, 47(3), 158-163 (1986-03-01)
Thermal desorption is a more sensitive alternative to solvent desorption for the determination of acrylonitrile in air. A dual-bed collection tube (Tenax GC and Carbosieve B) was developed for collecting and concentrating low levels of acrylonitrile. Two thermal desorption techniques
Patrycja Fastyn et al.
The Analyst, 128(2), 198-203 (2003-03-11)
The adsorption of water vapour in carbon molecular sieves (CMS) used to determine volatile organic compounds (VOCs) in air was investigated. The CMS mass in the trap was found not to affect the mass of retained water under conditions of
Hsin-Wang Liu et al.
Talanta, 80(2), 903-908 (2009-10-20)
An automatic sampling device, i.e., process sampling module (PSM), connected with a purge and trap-GC-FID system has been developed for real-time monitoring of VOCs in wastewater. The system was designed to simultaneously monitor 17 compounds, including one polar compound, i.e.
L Lamaa et al.
Talanta, 115, 881-886 (2013-09-24)
Volatile methyl siloxanes (VMS) have been detected in many different atmospheres such as biogas, sewage sludge, landfill gas, gasoline and ambient air. In these different atmospheres, their presence can involve several contamination problems and negative effects in industrial processes, their
J Masuda et al.
Water science and technology : a journal of the International Association on Water Pollution Research, 50(4), 121-124 (2004-10-16)
The sensory testing method applied under Japanese law to measure odor concentration has a lower detection limit of 10 in the specified Odor Index. To measure odor below the limit, a condensing procedure using solid sorbents (Tenax-TA, Unicarbon B and
Olga A Pogodina et al.
Analytical chemistry, 76(2), 464-468 (2004-01-15)
The determination of organic trace gases in the ambient environment at the lower ppb level is demonstrated based on a novel technique combining sorption tube sampling on Molsieve and Carbosieve S-III, thermal desorption, and detection of the trace analyte by
T D DiStefano et al.
Applied and environmental microbiology, 57(8), 2287-2292 (1991-08-01)
Tetrachloroethene, also known as perchloroethylene (PCE), is a common groundwater contaminant throughout the United States. The incomplete reductive dechlorination of PCE--resulting in accumulations of trichloroethene, dichloroethene isomers, and/or vinyl chloride--has been observed by many investigators in a wide variety of
Tung-Min Wu et al.
Journal of chromatography. A, 1105(1-2), 168-175 (2005-10-08)
A mesoporous silica MCM-41 with pore size of 29A was synthesized and assessed for its applicability as a sorbent for in-line trapping of volatile organic compounds (VOCs) from air samples. Several commercially available microporous carbon molecular sieves, i.e., Carbosieve SIII
Fabienne Palluau et al.
Environmental monitoring and assessment, 127(1-3), 177-187 (2006-08-10)
By using a dynamic dilution system, the atmospheric measurement of 11 selected toxics VOCs (ethylene, acetylene, propene, 1-butene, 1,3-butadiene, 1-pentene, 1-hexene, benzene, toluene, ethylbenzene, m+p-xylene) from the list WHO of 1996 and TO-14 method of US EPA by preconcentration by
J M Wong et al.
Analytical chemistry, 63(15), 1644-1650 (1991-08-01)
Volatile toxicants may be present in emissions from mobile and stationary sources as well as in ambient air. Methods for collecting and concentrating volatiles from air samples have been developed. Solid-phase adsorbents were compared in their trapping efficiencies for dichloromethane
Erica Liberto et al.
Journal of chromatography. A, 1489, 18-28 (2017-02-14)
Recent technological advances in dynamic headspace sampling (D-HS) and the possibility to automate this sampling method have lead to a marked improvement in its the performance, a strong renewal of interest in it, and have extended its fields of application.
R Magnusson et al.
Journal of chromatography. A, 1375, 17-26 (2014-12-17)
Phosphine (PH3), sulfuryl fluoride (SO2F2) and methyl bromide (CH3Br) are highly toxic chemical substances commonly used for fumigation, i.e., pest control with gaseous pesticides. Residues of fumigation agents constitute a health risk for workers affected, and therefore accurate methods for
Juliane Hollender et al.
Journal of chromatography. A, 962(1-2), 175-181 (2002-08-30)
A simple method using active trapping on adsorbents and thermal desorption followed by GC-MS analysis was developed for the indoor air monitoring of monoterpenes. The study was carried out using a dynamically generated atmosphere consisting of 11 monoterpenes: camphene, camphor
M L Matney et al.
AIHAJ : a journal for the science of occupational and environmental health and safety, 61(1), 69-75 (2000-04-20)
The sampling capability of Tenax-TA tubes, used in the National Aeronautics and Space Administration's solid sorbent air sampler to trap and concentrate contaminants from air aboard spacecraft, was improved by incorporating two sorbents within the tubes. Existing tubes containing only
Chien-Hou Wu et al.
Chemosphere, 56(1), 71-80 (2004-04-28)
Investigation of volatile organic compounds (VOCs) was first conducted in the air of class-100 cleanrooms at liquid crystal display (LCD) fabrication facilities. Air samples were collected on multisorbent tubes (including Carbopack B, Carbopack C, and Carbosieve S-III) and analyzed using
Roy M Harrison et al.
Research report (Health Effects Institute), (143), 3-96 (2009-12-17)
The overall aim of our investigation was to quantify the magnitude and range of individual personal exposures to a variety of air toxics and to develop models for exposure prediction on the basis of time-activity diaries. The specific research goals
John D Donaldson et al.
Journal of AOAC International, 86(1), 39-43 (2003-02-28)
A fast and accurate analytical method, which uses commercially available adsorbents (Tenax TA, Carbotrap B and C, and Carbosieve S-III), was developed for the sampling and determination of aromatic hydrocarbons, chloroaromatic compounds, and 2,3,7,8-tetrachlorodibenzo-p-dioxin. The breakthrough volume data show that
William A McClenny et al.
Journal of environmental monitoring : JEM, 4(5), 695-705 (2002-10-29)
Ambient air spiked with 1-10 ppbv concentrations of 41 toxic volatile organic compounds (VOCs) listed in US Environmental Protection Agency (EPA) Compendium Method TO-14A was monitored using solid sorbents for sample collection and a Varian Saturn 2000 ion trap mass
Chien-Hou Wu et al.
Journal of chromatography. A, 996(1-2), 225-231 (2003-07-02)
A method for the qualitative and quantitative analysis of volatile organic compounds (VOCs) in the air of class-100 clean rooms at semiconductor fabrication facilities was developed. Air samples from two semiconductor factories were collected each hour on multisorbent tubes (including
M Gawryś et al.
Journal of chromatography. A, 933(1-2), 107-116 (2002-01-05)
The water uptake by the solid sorbents Carbosieve S-III, Carboxen 569, 1000 and 1001, all of which are used for sampling of volatile organic compounds from the atmosphere. was examined using a direct experimental approach. The content of retained water
Yannick Juillet et al.
The Analyst, 130(6), 977-982 (2005-05-25)
Among the chemicals belonging to the schedules of the Chemical Weapons Convention (CWC), sampling and analysis of highly volatile compounds such as hydrogen cyanide (HCN) require special consideration. The latter is present in numerous old chemical weapons that are stockpiled
C Y Peng et al.
Journal of environmental monitoring : JEM, 2(4), 313-324 (2001-03-16)
Air sampling, using sorbents, thermal desorption and gas chromatography, is a versatile method for identifying and quantifying trace levels of volatile organic compounds (VOCs). Thermal desorption can provide high sensitivity, appropropriate choices of sorbents and method parameters can accommodate a
Jun Wang et al.
Environmental science & technology, 36(4), 797-808 (2002-03-07)
Laboratory experiments were conducted in a two-stage horizontal muffle furnace in order to monitor emissions from batch combustion of polystyrene (PS) and identify conditions that minimize them. PS is a dominant component of municipal and hospital waste streams. Bench-scale combustion
Piotr Kowalczyk et al.
Environmental science & technology, 42(8), 2931-2936 (2008-05-24)
Light membranes composed of single-walled carbon nanotubes (SWNTs) can serve as efficient nanoscale vessels for encapsulation of tetrafluoromethane at 300 K and operating external pressure of 1 bar. We use grand canonical Monte Carlo simulation for modeling of CF4 encapsulation
D R Nelson et al.
Applied microbiology, 28(2), 258-261 (1974-08-01)
A gas chromatographic procedure for the simultaneous analysis of (14)C-labeled and unlabeled metabolic gases from microbial methanogenic systems is described. H(2), CH(4), and CO(2) were separated within 2.5 min on a Carbosieve B column and were detected by thermal conductivity.
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