Environmental Analysis

Separation Science in collaboration with Markes International

Since 1997, Markes International has been at the forefront of innovation for enhancing the measurement of trace-level volatile and semi-volatile organic compounds (VOCs and SVOCs) by gas chromatography (GC).

Recent Posts

Effective monitoring of PAMS ozone precursors, TO-15 air toxics and OVOCs

This study from Markes International describes the sampling and analysis of a combined list of PAMS ozone precursors, TO-15 air toxics and OVOCs at high humidity, without the use of liquid nitrogen or other cryogen.

Selecting the best technique for VOC analysis

Do you need guidance on volatile organic compound monitoring and help in selecting the best technique for your application? If so, register for this upcoming webinar.

Learn an Effective Method for Monitoring Hydrocarbons and Polar VOCs

Do you face challenges monitoring PAMS hydrocarbons and polar VOCs at low ambient levels? This on-demand webinar outlines operating conditions for the PAMS autosampler/GC installed at the New York State Department of Environmental Conservation...

Monitoring SVOCs using thermal desorption

This application note summarises the features of Markes’ thermal desorption (TD) systems that allow them to offer excellent performance for the analysis of semi-volatile organic compounds (SVOCs), including long-chain hydrocarbons, PCBs,...

High-performance analysis of PAHs in air by TD–GC–MS

This study investigates the performance of Markes’ thermal desorption (TD) systems for the analysis of polycyclic aromatic hydrocarbons (PAHs) in air. 

Improve your characterisation of VOC and SVOC compounds

Do you need help with the comprehensive analysis of volatile and semi-volatile organics in either environmental or food samples? If so this webinar is for you. In it the presenters explain how challenges facing characterisation of volatile and...

A method validation and field study for the determination of trace-level phthalate esters in air using TD–GC–MS

This application note describes the performance of Markes’ thermal desorption (TD) systems for the GC–MS analysis of trace-level phthalates in air. 

How to achieve faster semivolatiles analysis with a scaled-down method and GC accelerator kit

Analysis times for semivolatile compounds can limit sample throughput and decrease overall lab productivity. In this technical article, an example of scaling down EPA Method 8270 and using a GC Accelerator kit to reduce cycle time is presented....

Achieve quantitative determination of semi-volatile PCBs using TD–GC–MS

This study describes the performance features that enable Markes’ thermal desorption (TD) systems to be used for the GC–MS analysis of trace-level polychlorinated biphenyls (PCBs) in air.

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...

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...

    

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