gas chromatograph Articles
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System Description for Monitoring Volatile Hydrocarbons
To help build a comprehensive Industrial Hygiene program, Buck Scientific introduces the IH910 vapor monitoring system utilizing our model 910 gas chromatograph and IH300 air sampling train. Designed to analyze hydrocarbons in air, such as degreasing solvents and paint vapors emitted during plant operations, the IH910 penetrates the 1mg/m3 detection barrier erected by other field portable ...
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FAST MONITORING IN PRODUCTION article
FIXING RESIDUAL SOLVENTS ISSUES IN FLEXIBLE PACKAGINGQuality control, on raw materials and on final products, is essential to approach and build a profitable collaboration with important and demanding customers. A high residual solvent concentration makes the flexible packaging smell, could modify the food or beverage flavor, may spoil the graphics (ex. blocking of the rolls) and may reduce its ...
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Analysis of Geosmin and 2-Methylisoborneol Utilizing the Stratum PTC and Aquatek 70
Abstract Geosmin and 2-Methylisoborneol are organic compounds that have a distinct scent. These compounds also have an extremely low odor detection threshold and because of this, many drinking water laboratories require detection levels of below 10ppt. This application note investigates the detection of Geosmin and 2-Methylisoborneol at a one part per trillion (ppt) level utilizing Purge and Trap ...
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Proposal for a deconvolution procedure for the gas chromatographic estimation of pristane and phytane in marine sediments
In this paper, a deconvolution procedure for improving the quantitative estimation of specific hydrocarbons by chromatographic techniques is reported. The proposed technique has been applied to the gas chromatographic determination of the pristane to phytane (pri/phy) ratio, an important parameter for the evaluation of biogenic and anthropogenic contributions present in the hydrocarbon content of ...
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Experimental Determination of LOD for VOCs in Ambient Air Measured by Auto-GCs and Comparison with Reference Methods
Abstract Automatic gas chromatograph (auto-GCs) manufacturers perform an experimental method for a simple, rapid, and low-cost detection limit evaluation for volatile organic compounds in ambient air. The principle is the estimation of a minimum area of a peak. It is a relevant area value that discerns a real peak from the ground noise. This experimental limit of detection is equal to the minimum ...
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GC Analysis of Crude Oil Samples in Compliance with ASTM D5307
In the ASTM D5307 test method, crude oil containing components with boiling points to temperatures in excess of 538C (C44 or equivalent) are analyzed by a simulated distillation GC system by the internal standard method. A detailed boiling point distribution graph is created for the fraction with boiling points lower than 538C. The fraction with boiling points above 538C is calculated as a ...
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Metrology and on-line gas chromatography on sulfur compounds in natural gas
Introduction With increased scrutiny and regulation on Natural Gas (NG) pipeline operators and distribution companies to accurately measure, odorize and report sulphur levels in the product the need is greater than ever for a precise way to perform the measurement. The on-going development of Gas Chromatographs (GC) with sulfur specific detectors, coupled with an increased need for ...
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Flavor and Aroma Profile of Hops Using FET-Headspace on the Teledyne Tekmar Versa with GC/MS
Abstract To brewers and the brewing industry, hops is an important beer component because of the flavor and aromas imparted during the hops addition process. Consequently, anticipating and/or validating the flavor profile of a particular variety of hops, based on analytical techniques, has become an increasingly useful tool in the head brewer’s repertoire. Hops flavors and aromas are ...
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The Extraction of Glycols From Water Using ENVI-Carb™ Plus Solid Phase Extraction Cartridges
The analysis of glycols such as propylene and ethylene glycol from water samples is traditionally done by direct aqueous injection into a gas chromatograph. Aqueous injections are problematic in GC analysis due to issues such as the large expansion volume of water in the inlet, increased carryover, and elevated detection limits. In this work, we have evaluated a unique carbon adsorbent, ENVI-Carb ...
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Semi-volatile organics in drinking water using EPA method 525.2 optimized for greater sensitivity
The US EPA Drinking Water Manual contains the methods used to identify and quantify regulated and unregulated organic drinking water contaminants. Included in this manual is Method 525.2, a Gas Chromatographic/ Mass Spectrophotometric (GC/MS) technique for the determination of semi-volatile organic compounds. Method 525.2 can be used for the identification and quantification of a group of ...
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Meeting the Korean Method ES 04605.3 for Formaldehyde with Static Headspace GC/MS
Introduction The Korean Standard Method for Drinking Water ES 04605.3 requires static headspace with Gas Chromatograph/Mass Spectrometer (GC/MS) to monitor formaldehyde. The method is based on the derivatization of formaldehyde with O-(2,3,4,5,6-pentafluorobenzyl) hydroxylamine (PFBHA) to form the pentafluorobenzyl oximine compound within a static headspace vial. The method requires that the ...
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SPME/GC Analyses of Sulfur Gases and VOCs, Using a Carboxen/PDMS Fiber
Sample extraction of sulfur compounds and VOCs by traditional methods can be difficult and expensive. Typically, sulfur analysis requires concentration of the gas using adsorbent tubes containing carbon adsorbents. Analysis by such means, however, requires the use of an expensive thermal desorption unit to heat the tubes before transferring the gases to a gas chromatograph. Analysis of VOCs ...
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Evaluation of the AutoMate-Q40 for Organochlorine Pesticides in Water
Introduction Organochlorine Pesticides (OCPs) are a group of persistent organic pollutants (POPs). In which most of these have been prohibited from use. OCPs are grouped into three group’s dichlorodipheny ethane (DDT, DDD, and DDE), cyclodiene (aldrin, dieldrin, heptachlor and endosulfan) and chlorocyclohexane (α, β, γ and δ-HCH). The QuEChERS extraction method is ...
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Validation of Wisconsin Gasoline Range Organics
Abstract The Wisconsin DNR Modified Gasoline Range Organics (Wisconsin GRO) Method is used to determine gasoline and gasoline components in water and soil. The water samples are analyzed by purge and trap, while the soil samples undergo an additional methanol extraction. For this application note, a working linear calibration curve and quality control checks were evaluted by using a Teledyne ...
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Requirements of an Automated Sample Delivery System in Today’s Realm of Ever Increasing Sensitivity Demands Utilizing the Atomx Concentrator/Multimatrix Autosampler
Abstract As today’s instrumentation and experimental techniques improve on sensitivity and efficiency, we must also provide better ways to decrease carryover and ensure the instrumentation is running at its optimum capability. In this study, data was collected to evaluate carryover of target analytes in subsequent blanks following high concentration samples. The sample analysis was ...
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Tips and Tricks for Gas Chromatography
Gas Chromatography can be considered a craft as well as a science, and as with all crafts, knowing insider tips and tricks can prove extremely useful. Capillary GC is clean GC Cleanliness is a critical requirement of capillary GC as contanimination is the largest source of capillary GC problems. To avoid contamination you can take some simple steps: Check your inlet The inlet is the most ...
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A Comparative Analysis of Fuel Oxygenates in Soil by Dynamic and Static Headspace Utilizing the HT3 Automatic Headspace Analyzer
Abstract This application note presents method development using classical headspace sample preparative techniques for the analysis of fuel oxygenates in a soil matrix. Fuel oxygenate compounds were analyzed using the HT3TM Automated Headspace Analyzer in conjunction with a Gas Chromatograph/Mass Spectrometer (GC/MS) system. Normal method validation including calibration, detection limit ...
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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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Prediction of partition coefficients for complex environmental contaminants: Validation of COSMOtherm, ABSOLV, and SPARC
Prediction of partition coefficients is essential for screening of environmentally relevant compounds. Prediction methods using only the molecular structure as input are especially useful for this purpose. In the present study, we validated three prediction methods, COSMOtherm, ABSOLV and SPARC, which are based on more mechanistic approaches than most other quantitative structure activity ...
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US EPA Method 524.2 with the Teledyne Tekmar Lumin P&T Concentrator and Agilent 7890B GC / 5977A 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) due to the 4 minute ...
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