GC-MS analysis Articles
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Extraction & Analysis of PAHs in Olive Oil Using SupelMIP SPE – PAHs and GC-MS
Polyaromatic hydrocarbons (PAHs) consist of fused aromatic rings and are formed as a by-product during the combustion of fuels. Seven PAHs in particular are known for their carcinogenic properties: benz[a]anthracene, benzo[a]pyrene, benzo[b]fluoranthene, benzo[k]fluoranthene, chrysene, dibenz[a,h]anthracene, and indeno[1,2,3-cd]pyrene. As such, they are monitored in both the environment and food ...
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GC-MS analysis of phthalate esters using hydrogen carrier gas
From July 22nd 2019, RoHS3 (directive 2015/863) added an update to the list of Phthalate esters included in the list of regulated substances. GC-MS is now the standard method for analysis of Phthalate esters. Abstract As helium increases in price and availability begins to affect supply of gas to laboratories, alternative carrier gases for GC-MS analysis are increasingly being adopted. An ...
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GC-MS Analysis Agricultural Pesticides on the SLB-5ms
This application illustrates the analysis of 29 different agricultural pesticides of different classifications and functionalities, using the SLB-5ms, 30 m x 0.25 mm I.D., 0.25 μm The analysis was done by GC-MS using selected ion monitoring (SIM) to allow detection of all compounds at 100 µg/L. The standard solution was made in toluene to increase it stability and enhance response of ...
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GC-MS Analysis of Polychlorinated Dibenzodioxins and Polychlorinated Dibenzofurans
Polychlorinated dibenzodioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) consist of 210 different compounds with varying degrees of toxicity, and the 17 congeners with chlorine substitution in the 2,3,7,8 positions are considered the most toxic. This chromatogram illustrates the separation of a 17 component 2,3,7,8-substituted PCDD and PCDF standard on a 30 m x 0.25 mm I.D. x 0.25 μm ...
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Fast Screening for Chlorinated Pesticides, Using Solid Phase Microextraction (SPME) and Capillary GC
Fast analysis of environmental samples increases throughput in the lab and is highly desirable for quick turnaround screening methods used in the field or prior to GC/MS analysis. Solid phase microextraction is a fast, solventless alternative to conventional sample extraction techniques. In SPME, analytes establish an equilibrium between the sample matrix and a stationary phase coated on a fused ...
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Analysis of Multi-Pesticide Residues in Vegetables, Food, and Fruits by SPE/GC-MS
Cleanup of matrices is the first, the most important, and the most critical step for both broad-spectrum screening and accurate determination of pesticides and their metabolites in vegetables,meats, drinks and fruits. In most cases, solid phase extraction (SPE) methods are used to clean up the extracts before the GC-MS analysis. The ideal SPE material(s) should remove the greatest number of food ...
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GC/MS analysis of a complex sample in DCM using hydrogen carrier gas
Labs worldwide have recently found that helium has been in short supply, leaving a number of labs without carrier gas. Added to this, helium prices have doubled over the past 10 years causing a number of labs to look into alternative carrier gases for GC, such as nitrogen and hydrogen. As well as lower price and unlimited availability, hydrogen has a number of potential advantages over helium, ...
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Biodegradation of organic compounds from coking wastewater with UASB reactor
The UASB reactor was applied for biodegradation of organic compounds in coking wastewater. The influent pH ranged between 6.8 and 7.2, and stirring speed and temperature were controlled at 2 r/min and 30±1°C, respectively. The reactor was successfully started up in 133 days. When the influent COD was 2,600 mg/L (VLR was 2.6 kg/m3 d), the removal rate of COD was about 54% and the effluent VFA was ...
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Occurrence and fate of endocrine disrupting chemicals in ASP based sewage treatment plant in Hardwar
The occurrence of emerging contaminants such as endocrine disrupting chemicals (EDCs) in our water resources is of prime concern. With this context, fate and seasonal variation of six EDCs (testosterone, T; progesterone, P; diethyl phthalate, DEP; dibutyl phthalate, DBP; propyl-paraben, PP and butyl-paraben, BP) were assessed throughout the year, i.e. in rainy, winter, spring and summer ...
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US EPA Method 625 Semivolatiles by GC-MS on the Supelco SLB™-5ms
Application Report 473: US EPA Method 625 describes the procedure for the analysis of industrial and municipal waste water samples by GC-MS. This analysis illustrates the separation of the single-peak base-neutral and acid compounds listed in the method, along with commonly used surrogates and internal standards. ...
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UCT Derivatizing Reagents Cited in ATS Study
Amphetamines Type Substances (ATS), which include amphetamine (AMP), methamphetamine (MA), 4-methylamphetamine (4-MA), 3,4-methylenedioxyamphetamine (MDA), 3,4-methylenedioxymethamphetamine (MDMA), 3,4-methylenedioxy-N-ethylamphetamine (MDEA), cathinone (CAT), and ephedrine (EPH), are widely acknowledged as common identified drugs of abuse. Alternative, new-age synthetic cathinones such as ...
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Removal of clomazone herbicide from a synthetic effluent by electrocoagulation
The aim of this work was to investigate the kinetics of removal of clomazone herbicide from an aqueous solution by electrocoagulation. The experiments were performed in a cylindrical batch reactor with six aluminum electrodes in monopolar mode, arranged in series and connected to a digital DC power. The aqueous solution (tap water + clomazone) with initial pH close to 7.9 was always treated ...
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Determination of chlorophenols in sediment using ultrasonic solvent extraction followed by solid-phase extraction, derivatization, and GC-MS analysis
A method for determination of chlorophenols (CPs) in sediments was developed using ultrasonic solvent extraction followed by solid-phase extraction, derivatization, and gas chromatography–mass spectrometry (GC-MS) analysis. Some effective operational details and parameters on mixing of samples and extraction solvent, adsorption loss, and extraction cycles of the derivatives were studied and ...
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Analysis of Volatile Organic Compounds in Water and Soil by EPA Method 8260 with the Atomx Concentrator/Multimatrix Autosampler
Abstract In order to determine the amount of Volatile Organic Compounds (VOCs) in water and soil matrices the USEPA developed Method 8260 in conjunction with preparative Method 5030 and 50351 . Since this method encompasses a wide range of matrices with an extensive range of concentration limits for VOCs, it is necessary to have an analytical system that is sensitive for enough for the lower ...
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Moscow snow reveals new air pollutants
GC-MS analysis of Moscow snow reveals new pollutants in the city air. Cities, with their traffic, industrial centers and factories, usually suffer from some degree of air pollution. Moscow, which houses all of these as well as power plants and an oil refinery, is no different. Regular monitoring of environmental pollutants is common practice in many cities and priority pollutants are detected ...
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Organic compounds migrating from plastic pipes into water
Case studies were carried out to identify potential chemical contaminants migrating to drinking water from polyvinyl chloride (PVC) or polyethylene (PE) pipes, available on the Polish market. Analyses were carried out by gas chromatography (GC) coupled with mass spectrometry (MS). Analysis of organotin compounds in water in contact with PVC pipes from different manufacturers found variability: ...
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Development and assessment of a novel Arxula adeninivorans androgen screen (A-YAS) assay and its application in analysis of cattle urine
Abstract The novel A-YAS assay for the detection of androgenic activity in liquid samples such as urine has been developed and assessed. The assay is based on transgenic Arxula adeninivorans yeast cells as the bio-component. The cells were engineered to co-express the human androgen receptor (hAR) gene and the inducible phytase reporter gene (phyK, derived from Klebsiella sp. ASR1), under the ...
By QuoData GmbH
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Fast GC-MS Analysis of US EPA Method 8270D Semivolatiles Using Supelco SLB-5ms
US EPA Method 8270D specifies a procedure for the determination of semivolatiles in solid waste and ground water samples. The method specifies that all analyses must be completed within 12 hours of meeting specific MS tune criteria. In this application, the principles of fast GC were applied to analyze a typical 8270 analyte list in under 8.5 minutes. This was achieved by using a 20 m x 0.18 mm ...
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Determining Volatile Organic Compounds from Difficult Soil Matrices Utilizing both Headspace and Purge and Trap Techniques
Abstract Purge and Trap concentration (P&T) along with Gas Chromatography/Mass Spectrometry (GC/MS) analysis is the traditionally used method for the analysis of Volatile Organic Compounds (VOCs). This application note investigates P&T concentration of VOCs in soils utilizing both the standard soil and the automated methanol extraction technique of Teledyne Tekmar’s Atomx, a ...
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The effect of draw out lens diameter on sensitivity of GC–MS analysis
Gas chromatography–mass spectrometry (GC–MS) allows isolation and identification of individual analytes within a complex mixture. Helium has traditionally been the first-choice carrier gas, owing to its inertness, performance, and relatively cheap price. Since 2001, however, helium has become increasingly expensive with a reported global increase in price of 500% between 2001 and 2016 ...
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