Chromatograph Articles on Environmental XPRT

A Portable High Speed Gas Chromatograph for Field Monitoring

Over the last two decades a variety of portable or transportable gas chromatographs (GC) have been specifically designed for field use. Each instrument has introduced innovations that have simplified the task of on site air monitoring. Portable instrument users are well aware of the advantages of field sampling. These advantages include more representative results because there is no sample ...

Jan. 1, 2003

BTEX monitor, equal performances to laboratory chromatographs

Environnement S.A leveraged its technical leadership in this field with an extensive experience, being one of the first companies creating its first BTEX analyser almost 20 years ago. The VOC72M third generation of ...

Jul. 24, 2014

By Environnement S.A

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 ...

Feb. 3, 2009

By Inderscience Publishers

Evaluating Guidelines for Air Sampling Methods Utilizing Chromatographic Analysis

The following evaluation guidelines were developed to provide chemists of the Methods Development Team with a uniform and practical means for evaluating sampling and analytical methods that utilize chromatographic techniques. The guidelines define sampling and analytical parameters, specify required laboratory tests, statistical calculations, and criteria for acceptance, and provide a detailed ...

Jan. 1, 1999

By U.S. Department of Labor Occupational Safety & Health Administration (OSHA)

Non-woven electrostatic media for chromatographic separation of biological particles

The filtration and separation of biological particles has been estimated as 40% of the cost in the manufacture of pharmaceuticals. Liquid chromatography that is the principal method for separating biological particles uses a permanent phase of ultrafine adsorbent particles such as porous silica or resin spheres with particle sizes down to about 1 micron. Speed and resolution are two competing ...

Mar. 6, 2012

By Argonide Corporation

Optimized data handling for automatically calculating the Hydrocarbon Index (HI) of “Produced Waters” from gas chromatographic analysis with Galaxie™ Software

The extraction of Oil and Gas from Subsea wells produces large quantities of waste water contaminated with hydrocarbons. These “Produced Waters” are disposed of directly into the oceans. Determination of the Hydrocarbon Index (HI) is required to meet environmental legislation.Traditionally infra red methods have been used but these require solvents extraction using solvents that present their own ...

Mar. 10, 2009

Novel mixed-mode stationary phases for chromatographic separation of complex mixtures of decomposed lignin

Abstract Electrochemical degradation of lignin results in a large number of unknown products, formed by both oxidative and reductive decomposition pathways, which have previously been studied by direct mass spectrometry experiments without prior liquid chromatography separation, revealing the presence of many isobaric molecules. In this study, novel phosphonium-based ionic liquid stationary ...

Jan. 13, 2017

By SusChem

Rapid Gas Chromatographic Technique for the Determination of HYDROGEN in Reactor & Process Streams and Fuel-Cell Systems

HYDROGEN is the most prevalent Element in the Universe… the “essence of Star Stuff” according to the late, great Carl Sagan. It is the ultimate “clean” fuel, with WATER as the predominant waste product… though care must be taken to minimize its unfortunate tendency to cause explosions. Hydrogen is formed in Nuclear Reactors, from low-efficiency Hydrolysis, in smaller amounts from natural Bio-Mass ...

Jan. 1, 2006

By Buck Scientific Inc

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 gas ...

Jan. 1, 2006

By Buck Scientific Inc

Top 16 for 2016 - Restek LC article makes the cut

If you are an avid chromatographer you likely subscribe to LC/GC magazine or its popular electronic version, E-Separation Solutions. It is definitely the place to go for news and information related to all things Chromatography. Over the years Restek has had many an article published in LC/GC and, full disclosure, we advertise there as well. Who in the business doesn’t? It is the place ...

Jan. 10, 2017

By Restek Corporation

Development of headspace–gas chromatography–flame ionization detection procedure to determine volatile fatty acids in zoo organic waste leachates

In order to determine volatile fatty acids (short chain monocarboxylic acids with 2 to 6 carbon atoms in a molecule) in leachates formed in organic waste piles a procedure based on static headspace (HS) coupled with gas chromatography (GC) have been proposed and optimized. The conditions of HS extraction and sample introduction into a gas chromatograph as well as of chromatographic separation ...

Jan. 1, 2011

By IWA Publishing

The investigation of compositional and structural characteristics of natural marine organic matter: a review

The natural marine Organic Matter (OM) is a complex mixture of carbohydrates, lipids and proteins present in seawater and sediments, able to affect many processes occurring in the marine environment such as the biochemical cycles of marine nutrients and living organisms. As the complexity of environmental studies concerning OM composition requires the application of accurate analytical methods, ...

May 22, 2008

By Inderscience Publishers

Complex Mixture Using Hydrogen as a Carrier Gas

The following technical brief aims to demonstrate the performance of GC-MS using hydrogen as a carrier gas. Here we compare the performance of hydrogen and helium for the analysis of a complex mixture. The results show that by using hydrogen, chromatographers can achieve superior results to helium, with faster run times and taller, sharper ...

Jul. 16, 2013

By Peak Scientific Instruments Ltd

Petroleum/Chemicals Application Guide

This guide contains information about Supelco products and technology for performing detailed hydrocarbon analysis by chromatographic methods. Various applications are discussed; including, simulated distillation, polynuclear aromatic hydrocarbons, phenols / polymers, petrochemical analysis, high resolution and high speed analyses, and packed column applications. Columns used range from the ...

Dec. 31, 2004

By MilliporeSigma

An overview of post-column derivatization methods from a pharmaceutical applications perspective

High performance liquid chromatography (HPLC) is the technique of choice for separating analytes pursuant to their detection, identification, quantification and/or purification. Most organic substances, and certainly the majority of pharmaceuticals, are polar, nonvolatile or thermally labile molecules that are amenable to HPLC separation. Moreover, the availability of a large variety of LC column ...

Jun. 15, 2007

By Pickering Laboratories, Inc.

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 ...

Mar. 31, 2014

By Shimadzu Scientific Instruments Inc

The development of cation-exchange chromatography in free amino acids analysis

Although it was not called a liquid chromatograph, the first such instrument was introduced in late 1959 by Beckman Instruments and was designated the M.S. Amino Acid Analyzer in honour of Moore and Stein. Inject valves had yet to be invented, the buffer switching valves were glass stopcocks and the column temperature was controlled by circulating water baths. Two positive displacement pumps ...

Aug. 22, 2007

By Pickering Laboratories, Inc.

ChlorAC Buffer

Introduction Trace analysis of carbamate insecticide residues in water is a routine requirement in the U.S. Since several of the common carbamates — Carbaryl, Oxamyl, Hydroxycarbofuran — are labile in water due to oxidation or hydrolysis, the samples and standards must be preserved in order to obtain valid results. USEPA Method 531.1 specifies pH adjustment, ...

Jun. 10, 2010

By Pickering Laboratories, Inc.

Testing of Pharmaceutical & Cosmetic Raw Materials & Final Product Formulations for CODEX, USP/NF & BP Regulations

There are STANDARD Guidelines used to define the Identification and Purity of compounds used in Pharmaceutical and Cosmetic formulations, as well as the final Products. These protocols are described in great detail in the various Monographs of the United States and British Pharmacopoeias, the National Formulary (USP/NF and BP), the International FAO/WHO Codex (CODEX) and other Regulatory ...

Jan. 1, 2006

By Buck Scientific Inc

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 ...

Nov. 3, 2010

By MilliporeSigma

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