Environmental Analysis

Using thermal desorption for the quantitative analysis of long-chain hydrocarbons

This study investigates the ability of Markes’ thermal desorption (TD) systems to monitor semi-volatile organic compounds (SVOCs), using a wide range of n-alkanes (n-C16 to n-C44) as a model.

Innovative Cryogen-free Ambient Air Monitoring of Trace-level Air Toxics at High Humidity

Markes International has produced an application note describing how a canister autosampler (using innovative cryogen-free water-removal technology) and thermal desorption–gas chromatography–mass spectrometry (TD–GC–MS) together allow the analysis...

Online monitoring of atmospheric aerosols

Atmospheric aerosols exert a large but uncertain negative (cooling) radiative forcing on regional climate. Their chemical composition affects this climate forcing via aerosol hydroscopicity and consequential cloud interactions, as well as providing...

Cryogen-Free Analysis of Trace-Level EPA TO-15 ‘Air Toxics’ in Humid Air

Volatile organic compounds (VOCs) are primarily monitored using canisters in accordance with US EPA Method TO-15. However, analysis of these ‘air toxics’ is challenged by the ever-greater range of analytes and concentrations of interest, and by the...

The Application of Thermal Desorption to Chemical Ecology

Markes International has produced an application note that provides an overview of the fundamentals of thermal desorption (TD) and compatible sampling techniques, as used for chemical ecology studies.

How to Achieve Effective Fractionation of Aliphatic and Aromatic Hydrocarbons in Petroleum Extracts

UCT has produced an application note describing the fractionation of aliphatic and aromatic hydrocarbons in petroleum extracts using UCT’s EPH silica gel SPE cartridges. The fractionation of the total extractable petroleum hydrocarbons (EPH) is...

Highly Efficient Monitoring of VOCs in Stack Emissions using TD-GC-MS

Markes International has produced an application note for the highly efficient monitoring of VOCs in stack emissions using sorbent tubes analysed by TD–GC–MS in accordance with European standard method CEN/TS 13649. The value of repeat analysis for...

GC×GC–FID for Routine Analysis of Total Petroleum Hydrocarbons

SepSolve Analytical has produced an application note describing a flow-modulated GC×GC–FID system for the analysis of total petrochemical hydrocarbons (TPH) in environmental media. The application note demonstrates how use of this system eliminates...

Innovative Cryogen-free Ambient Air Monitoring in Compliance with US EPA Method TO-15

Markes International has produced an application note describing the GC–MS analysis of humidified canister ‘air toxics’ samples at various relative humidities, using cryogen-free systems for thermal desorption preconcentration. Detection of 65...

Determination of Olefin Content in Denatured Ethanol According to ASTM D7347

Agilent Technologies has produced an application note demonstrating the determination of the olefin content in denatured ethanol using the Agilent 1260 Infinity Analytical SFC system together with the SIM Flame Ionization Detector (FID).

Advances in Environmental Analysis eSeminar

View the on-demand version of this eSeminarSeparation Science, in collaboration with its sponsors Markes International, Agilent Technologies and PerkinElmer, has developed its third online eSeminar focusing on advances in environmental analysis....

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