GC-MS Articles
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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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Feasibility of Soil Dust Source Apportionment by the Pyrolysis-Gas Chromatography/Mass Spectrometry Method
This study tested the feasibility of using pyrolysis (Py)-gas chromatography (GC)/mass spectrometry (MS) to obtain organic chemical species data suitable for source apportionment modeling of soil-derived coarse particulate matter (PM10) dust on ambient filters. A laboratory resuspension apparatus was used with known soils to generate simulated receptor filter samples loaded with 0.4 mg of ...
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Thermal Desorption-GC/MS Analysis of polycyclic aromatic hydrocarbons on fine particulates in air
Polycyclic aromatic hydrocarbons (PAHs) are commonly found throughout the environment in soil, water and adsorbed to fine particulate matter in air. Of the 16 common PAHs, 7 have been classified as animal carcinogens by the International Agency for Research on Cancer (IARC). Resulting from this classification, PAHs are monitored and regulated in the environment. Analysis of PAHs in soil and water ...
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What is in e-cig liquid?
In a recent white paper, Restek corporation identified a simple methodology for the simple comparison of e-cigarette liquids using GC-MS and GC-FID. E-cigarettes have been a fairly recent phenomenon. An alternative to smoking tobacco, e-cigarettes work by vaporizing a liquid which is then inhaled by the user. Despite only being available to the market for a few years, e-cigarettes are thought to ...
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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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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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Aerating recycled water on mushroom composting sites affects its chemical analysis and the characteristics of odor emissions
Recycled water (RW) containing compost leachate can be a potent source of foul odor on mushroom composting sites. Samples of RW were repeatedly collected from storage tanks and pits of 14 mushroom composting sites in England and Ireland. Relationships between the effects of submerged aeration of the RW, the chemical and microbial characteristics of the RW, and the odors emitted were investigated. ...
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Integration of US/Fe2+ and photo-Fenton in sequencing for degradation of landfill leachate
The landfill leachate treated by sonication in presence of Fe2+ (US/Fe2+) and then by photo-Fenton achieved the highest total organic carbon (TOC) removal efficiency among the screened processes. The lower initial pH, dosage of Fe2+ and initial concentration of leachate were helpful in raising TOC removal efficiency of leachate by US/Fe2+. The optimal conditions for the US-photo-Fenton ...
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Synthesized heterogeneous Fenton-like goethite (FeOOH) catalyst for degradation of
p -chloronitrobenzeneThe removal of p-chloronitrobenzene (pCNB) was investigated by a heterogeneous Fenton-like system using a laboratory synthesized goethite (FeOOH) as catalyst. The influencing factors and the degradation pathway of pCNB were also evaluated. With a stronger catalytic activity than Fe2+ catalyst, the synthesized FeOOH catalyst can significantly promote the decomposition of H2O2, and the ...
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Determination of Polycyclic Aromatic Hydrocarbons in Seafood by an Automated QuEChERS Solution
Abstract Polycyclic Aromatic Hydrocarbons (PAHs) are a large group of organic compounds found naturally in the environment. PAHs are monitored by the US Environmental Protection Agency due to their carcinogenic characteristics. In recent global events, PAHs have come to the attention for contamination in sea food samples due to the oil spills. In the oceanic environment, PAHs are bio-available ...
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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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Benzene Monitoring: Comparing Real-Time to Method 325
Executive Summary EPA’s Refinery Sector Rule, issued in 2015, includes monitoring air concentrations of benzene along the perimeter/fenceline of U.S. refineries. EPA Method 325 A & B requires refineries to continuously monitor benzene using passive sampling tubes over 14-day intervals. Method 325A details field protocols for the deployment and collection of passive sampling tubes, while ...
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Mass balance and mass loading of polybrominated diphenyl ethers (PBDEs) in a tertiary wastewater treatment plant using SBSE-TD-GC/MS
A mass loading and mass balance analysis was performed on selected polybromodiphenyl ethers (PBDEs) in the first full-scale indirect potable reuse treatment plant in the United States. Chemical analysis of PBDEs was performed using an environmentally friendly sample preparation technique, called stir-bar sorptive extraction (SBSE), coupled with thermal desorption and gas chromatography/mass ...
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Innovations in Site Characterization. Case Study: Hanscom Air Force Base, Operable Unit 1 (Sites 1, 2, and 3)
Executive Summary Field analytical instrumentation and methods were used to support a site characterization study at the Airfield at Hanscom Air Force Base (HAFB) Operable Unit 1. HAFB is located in Middlesex County, Massachusetts, and occupies land in the towns of Bedford, Concord, Lexington, and Lincoln. U.S. Air Force military operations began in 1941 and continued through 1973. With the ...
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Advanced treatment of landfill leachate membrane concentrates: performance comparison, biosafety and toxic residue analysis
With the improvement of people's consciousness about health, more attention has been paid to the biosafety of effluent reaching conventional discharge standard. In this contribution, removal efficiency of chemical oxygen demand (COD), acute toxicity, genotoxicity and estrogenicity in landfill leachate membrane concentrates (MCs) among UV-Fenton, Fenton and activated carbon adsorption process ...
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Application of gas chromatography-mass spectrometry preceded by solvent extraction to determine volatile fatty acids in wastewater of municipal, animal farm and landfill origin
This study describes extraction of selected volatile fatty acids (VFAs) (containing from 2 up to 8 carbon atoms) with methyl-tert-butyl ether (MTBE) from polluted aqueous samples followed by separation, identification and quantification by gas chromatography coupled with mass spectrometry (GC-MS). Extraction parameters such as time and number of extractions, volume ratio, effect of acidification ...
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A Dynamic Site Investigation: Adaptive Sampling and Analysis Program for Operable Unit 1 at Hanscom Air Force Base, Bedford, Massachusetts
Abstract In this study, field analytical instrumentation and methods were used to support a risk assessment study at the airfield at Hanscom Air Force Base (HAFB, Bedford, Massachusetts). The site investigation is part of an ongoing effort to determine contaminant risk to ground water from soil. The field tools supported a dynamic workplan/adaptive sampling and analysis demonstration. Over a ...
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Exploring US EPA Method 524 Purge and Trap Variables: Water Vapor Reduction and Minimizing Cycle Time
Introduction Purge and Trap (P&T) concentrators have been used extensively for the analysis of Volatile Organic Compounds (VOCs) in water since the mid 1970’s. By passing a purge gas through the sample, VOCs are swept to an adsorbent analytical trap on which they are collected. The trapped compounds are then released through thermal desorption, separated by gas chromatography, and then ...
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How Can TO-15 Help You Solve Your Next IAQ Problem?
Untitled Document Have you ever been asked to investigate unpleasant odors in a home or at the workplace? Are occupants developing headaches or a feeling of nausea? It may be prudent for you to include a general volatile organic compound (VOC) scan in your sampling strategy. The best way to sample the widest range of compounds with the greatest of ease is TO-15. VOCs ...
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Understanding Thermal Desorption: A Comprehensive Guide
Thermal desorption is a powerful technique used in various fields, including environmental science, analytical chemistry, and material science. It involves the process of heating a material to release volatile compounds or contaminants absorbed within it. This technique is widely employed for the analysis, remediation, and purification of solids, liquids, and gases. In this comprehensive guide, ...
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