GC-MS Articles
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US EPA Method 8260 with the Tekmar Lumin P&T Concentrator and Thermo Scientific TRACE 1310 GC and ISQ MS
Abstract US EPA Method 8260 is used primarily by environmental labs for the analysis of volatile organic compounds (VOCs) in soils and water. While this method is effective at concentrating the trace levels of VOCs sometimes found in water and wet soils, it also tends to transfer significant quantities of water vapor to gas chromatographymass spectrometry instruments (GC-MS). To reduce the ...
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US EPA Method 624 with the Tekmar Lumin P&T Concentrator and the Thermo Scientific TRACE 1310 GC and ISQ LT MS
Abstract US EPA Method 624 is used primarily by environmental labs for the analysis of volatile organic compounds (VOCs) in wastewater. While this method is effective at concentrating the trace levels of VOCs sometimes found in water, it also tends to transfer significant quantities of water vapor to gas chromatography-mass spectrometry (GC-MS) instruments. To reduce the amount of water ...
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US EPA Method 624 with the Tekmar Lumin and the Agilent 7890B GC / 5977A MS
Abstract US EPA Method 624 is used primarily by environmental labs for the analysis of Volatile Organic Compounds (VOCs) in wastewater. While this method is effective at concentrating the trace levels of VOCs sometimes found in water, it also tends to transfer significant quantities of water vapor to Gas Chromatograph/Mass Spectrometer (GC/MS) instruments. To reduce the amount of water ...
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US EPA Method 624 with the Tekmar Lumin and the PerkinElmer Clarus 600 GC/SQ 8T MS
Abstract US EPA Method 624 is used primarily by environmental labs for the analysis of Volatile Organic Compounds (VOCs) in wastewater. While this method is effective at concentrating the trace levels of VOCs sometimes found in water, it also tends to transfer significant quantities of water vapor to Gas Chromatograph/Mass Spectrometer (GC/MS) instruments. To reduce the amount of water ...
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US EPA Method 8260 with the Tekmar Lumin and the Agilent 7890B GC / 5977A MS
Abstract US EPA Method 8260 is used primarily by environmental labs for the analysis of Volatile Organic Compounds (VOCs) in soils and water. While this method is effective at concentrating the trace levels of VOCs sometimes found in water and wet soils, it also tends to transfer significant quantities of water vapor to Gas Chromatograph/Mass Spectrometer (GC/MS) instruments. To reduce the ...
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Knotted in-tube and mini-column solid phase extraction of polycyclic aromatic compounds and nitroaromatics from aqueous samples for their determination by gas chromatography–mass spectrometry
The selectivity of in-tube extraction by PTFE tubing vis-a-vis mini-column SPE has been evaluated for preconcentration and cleanup of PACs in their natural matrix, and has been found to effectively remove many polar analytes such as nitrogen containing aromatic heterocyclic compounds, anilines, phenols and certain organophosphorus pesticides. Knitting of tubings created a secondary flow pattern ...
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Monitoring organophosphorus pesticides and their degradation products formed by Fenton's reagent using solid-phase extraction–gas chromatography–mass spectrometry
Styrene-divinylbenzene co-polymer (PLRP-S) has been found to be a suitable sorbent for the extraction of organophosphorus pesticides (OPPs) and their decomposition products formed by reaction with the Fenton reagent. The preconcentrated analytes have been eluted with ethyl acetate and analysed by GC-MS. A linear calibration graph was obtained for 0.5–40 µg L-1 of OPPs using 60 ml of sample ...
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On the thermal oxidation stability of pyrolysis biomass oil
The rice husk-based biomass-oil is composed of complex organic compounds and water, and its oxidation stability has a direct influence on its physico-chemical property and application. The advanced oxidation experiments were carried out through the flowing of air and oxygen respectively. The influences of four factors, including gas flux, oxidation time, temperature and copper foil, on the ...
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US EPA Method 524.2 with the Teledyne Tekmar Atomx XYZ and Thermo Scientific TRACE 1310 GC and ISQ 7000 MS System with an Advanced Electron Ionization (AEI) Source
Abstract US EPA Method 524.2 was used to determine the concentration of volatile organic compounds (VOCs) in drinking water. This method is effective at concentrating trace levels of VOCs, however it can also transfer a significant amount of water vapor to the Gas Chromatograph/Mass Spectrometer (GC/MS) due to the recommended four-minute desorb time. The Teledyne Tekmar Atomx XYZ purge and trap ...
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Odorant screening and possible origin analysis of odor episodes in one reservoir in northern China
Odorous drinking water problem occurred repeatedly in one city in northern China in recent years. The uniqueness of this odor episode lay in two aspects: (1) the odorous chemicals were quite different from common odorants, such as geosmin and 2-MIB; and (2) it occurred repeatedly in different seasons during a time span of more than 2 years. The screening of odorants was the first and one of ...
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Variations of odorous VOCs detected by different assessors via gas chromatography coupled with mass spectrometry and olfactory detection port (ODP) system
Odorous volatile organic compounds (VOCs) were analysed via a thermal desorption gas chromatograph coupled with a mass spectrometer and olfactory detection port (TD-GC-MS/ODP) to characterize odour emissions from a wastewater treatment plant (WWTP). Three trained ODP assessors, screened according to the European dynamic olfactometry standard (EN: 13725), were used for the olfactory analysis. ...
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US EPA Method 524.2 with the Teledyne Tekmar Lumin P&T Concentrator and PerkinElmer Clarus 600 GC/Clarus SQ8T MS
Abstract US EPA Method 524.2 is used primarily by environmental labs for the analysis of Volatile Organic Compounds (VOCs) in drinking water. While this method is effective at concentrating the trace levels of VOCs sometimes found in finished drinking water, it also tends to transfer significant quantities of water vapor to the Gas Chromatograph/Mass Spectrometer (GC/MS). To reduce the amount ...
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US EPA Method 524.2 using the Teledyne Tekmar Atomx XYZ and Thermo Scientific ISQ 7000 Mass Spectrometry (MS) System Coupled with a Thermo Scientific TRACE 1310 Gas Chromatograph (GC)
Abstract US EPA Method 524.2 was used to determine the concentration of volatile organic compounds (VOCs) in drinking water. This method is effective at concentrating trace levels of VOCs, however it can also transfer a significant amount of water vapor to the Gas Chromatograph/Mass Spectrometer (GC/MS) due to the four-minute desorb time recommendation. The Teledyne Tekmar Atomx XYZ purge and ...
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Optimisation of analytical method for estrogen in surface water and primary risk assessment in South Creek
A very non-polar sorbent, polystyrene-divinyl-benzene (brand: biobeads supplied by BioRad, with 30∼50 mesh) was tested for its extraction efficiency of four target compounds, estrone, estradiol, ethynylestradiol and estriol, from larger volumes (8 l) of water samples. To achieve adequate sensitivity of instrumental analysis by GC/MS, an improved estrogen derivatisation method was developed. For ...
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Degradation of Reactive Yellow X-RG by O3/Fenton system: response surface approach, reaction mechanism, and degradation pathway
O3/Fenton for the treatment of effluent containing Reactive Yellow X-RG is investigated. The response surface methodology is applied to study the main and interactive effects of the parameters. With the initial dye concentration being controlled at 300 mg L−1, the optimized conditions for wastewater treatment are 3.68, 29.19 and 18.49 mg min−1 for initial pH, mole ratio of [H2O2]/[Fe2+] and ...
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Analysis of Haloacetic Acids in Tap Water Using LC/MS/MS
Haloacetic acids are produced as by-products of chlorination in the water treatment purification process. Three haloacetic acids, monochloroacetic acid (MCAA), dichloroacetic acid (DCAA), and trichloroacetic acid (TCAA), are subject to water quality standard for drinking water with established limits (MCAA: 0.02 mg/L, DCAA: 0.04 mg/L, TCAA: 0.2 mg/L) by Japan Ministry of Health, Labour and ...
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Catalytic wet oxidation of ferulic acid
Catalytic Wet Oxidation (CWO) of aqueous ferulic acid (a lignin model compound) was carried out under mild conditions (100?150?C, ~300 kPa PO2). Significant removal of ferulic acid (in terms of Total Organic Carbon (TOC)) (81% at 100?C and 95% at 150?C after 2 hr) was obtained using a CuNiCe/Al2O3 catalyst. A considerable portion of this TOC was removed during the heat-up period prior to oxygen ...
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Transformation characteristics of organic pollutants in Fered-Fenton process for dry-spun acrylic fiber wastewater treatment
The Fered-Fenton process using Ti sheet as cathode and RuO2/Ti as anode was employed for the pretreatment of dry-spun acrylic fiber manufacturing wastewater. The effects of feeding mode and concentration of H2O2 on chemical oxygen demand (COD) removal efficiency as well as the biodegradability variation during the Fered-Fenton process were investigated. The feeding mode of H2O2 had significant ...
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Determination of odorous VOCs and the risk of occupational exposure to airborne compounds at the waste water treatment plants
Concentrations of non methane-VOCs and risk levels of employees’ exposure to VOCs were determined at two Finnish waste water treatment plants. The concentration of hydrogen sulphide (H2S) reached the Finnish OEL (occupational exposure limit). The concentrations of styrene, 1,2-dichloroethane, and toluene were found to be elevated at plant A. 328.4 μg/m3 of styrene and 709.8 μg/m3 toluene was ...
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Odour reduction strategies for biosolids produced from a Western Australian wastewater treatment plant: results from Phase I laboratory trials
This study investigated sources of odours from biosolids produced from a Western Australian wastewater treatment plant and examined possible strategies for odour reduction, specifically chemical additions and reduction of centrifuge speed on a laboratory scale. To identify the odorous compounds and assess the effectiveness of the odour reduction measures trialled in this study, headspace ...
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