--- title: Environmental Analysis Blog | Separation Science in collaboration with Markes International description: 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). --- - [Home](https://www.sepscience.com/enviro) - [Separation Science](https://www.sepscience.com) - [日本語](https://www.sepscience.com/japan) - [Chromatography Forum](http://www.chromforum.org/) - [Analytical Training Solutions](https://www.analytical-training-solutions.com) - [Contact Us](https://www.sepscience.com/eclipse-business-media/contact-us/) - [Subscribe for free](https://www.sepscience.com/subscribe/) [![Separation Science](https://blog.sepscience.com/hubfs/Sepscience_Dec2016/images/-resized-strch-SepSci_WebHeader_v3.png)](https://www.sepscience.com/) - [Food](https://www.sepscience.com/food) - [Enviro](https://www.sepscience.com/enviro) - [Pharma](https://www.sepscience.com/pharma) - [Bio Clinical](https://www.sepscience.com/bioclinical) - [LC](https://www.sepscience.com/lc) - [GC](https://www.sepscience.com/gc) - [MS](https://www.sepscience.com/ms) - [Methods & Applications](https://www.sepscience.com/methods-and-applications/) - [Webinars & eSeminars](https://www.sepscience.com/webinars-and-eseminars/) - [Videos & Tutorials](https://www.sepscience.com/videos-and-tutorials/) - [Home](https://www.sepscience.com/) - [Get in Touch with Us](https://www.sepscience.com/) - [Home](https://www.sepscience.com/enviro) - Environmental Analysis[Environmental Analysis](https://blog.sepscience.com/environmental) - [Environmental Analysis Blog](https://blog.sepscience.com/environmental/author/separation-science-in-collaboration-with-markes-international) # Environmental Analysis ## Separation Science in collaboration with Markes International ![](https://blog.sepscience.com/hubfs/Companies/Markes/Markes.png) 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 ### [How to optimise your PFAS air sampling method using thermal desorption](https://blog.sepscience.com/environmental/how-to-optimise-your-pfas-air-sampling-method-using-thermal-desorption) Discover the advantages that thermal desorption (TD) offers, how to optimise a system for targeted and untargeted per- and polyfluoroalkyl substances (PFAS) analysis, and how to overcome challenges posed by low-level PFAS monitoring by viewing this [...](https://webinar.sepscience.com/form/enviro/v2/how-to-optimise-your-pfas-air-sampling-method-using-thermal-desorption) [Read More](https://blog.sepscience.com/environmental/how-to-optimise-your-pfas-air-sampling-method-using-thermal-desorption) ### [PAMS Analysis during COVID-19 Lockdowns in New York City](https://blog.sepscience.com/environmental/pams-analysis-during-covid-19-lockdowns-in-new-york-city) This on-demand webinar discusses PAMS (Photochemical Assessment Monitoring Stations) analysis conducted during Covid-19 lockdowns and how excellent data stability is achieved over extended sampling periods. [Read More](https://blog.sepscience.com/environmental/pams-analysis-during-covid-19-lockdowns-in-new-york-city) ### [Benefits of Sample Prep with GC×GC and GC-MS for Environmental Applications](https://blog.sepscience.com/environmental/benefits-of-sample-prep-with-gcgc-and-gc-ms-for-environmental-applications) Separation Science, in collaboration with Markes International and SepSolve Analytical, offers a selection of application notes relevant for environmental analysis embracing sample extraction and enrichment with comprehensive GC (GC×GC) and GC-MS. [Read More](https://blog.sepscience.com/environmental/benefits-of-sample-prep-with-gcgc-and-gc-ms-for-environmental-applications) ### [The POD Sampler - A new development in radial diffusive sampling for VOCs](https://blog.sepscience.com/environmental/the-pod-sampler-a-new-development-in-radial-diffusive-sampling-for-vocs) Diffusive sampling has been a standard technique in the tool kit for analysts involved in environmental monitoring and occupational hygiene monitoring since the 1980s. It has been adopted widely due to the advantages of being able to deploy samplers... [Read More](https://blog.sepscience.com/environmental/the-pod-sampler-a-new-development-in-radial-diffusive-sampling-for-vocs) ### [Passive Sampling and Its Pivotal Role in ʹGreenerʹ Sampling of VOCs](https://blog.sepscience.com/environmental/passive-sampling-and-its-pivotal-role-in-ʹgreenerʹ-sampling-of-vocs) [Read More](https://blog.sepscience.com/environmental/passive-sampling-and-its-pivotal-role-in-ʹgreenerʹ-sampling-of-vocs) ### [Effective monitoring of PAMS ozone precursors, TO-15 air toxics and OVOCs](https://blog.sepscience.com/environmental/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. [Read More](https://blog.sepscience.com/environmental/effective-monitoring-of-pams-ozone-precursors-to-15-air-toxics-and-ovocs) ### [Selecting the best technique for VOC analysis](https://blog.sepscience.com/environmental/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, this on-demand webinar can provide you with the answers. [Read More](https://blog.sepscience.com/environmental/selecting-the-best-technique-for-voc-analysis) ### [Learn an Effective Method for Monitoring Hydrocarbons and Polar VOCs](https://blog.sepscience.com/environmental/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... [Read More](https://blog.sepscience.com/environmental/learn-an-effective-method-for-monitoring-hydrocarbons-and-polar-vocs) ### [Monitoring SVOCs using thermal desorption](https://blog.sepscience.com/environmental/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, phthalates,... [Read More](https://blog.sepscience.com/environmental/monitoring-svocs-using-thermal-desorption) ### [High-performance analysis of PAHs in air by TD–GC–MS](https://blog.sepscience.com/environmental/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.  [Read More](https://blog.sepscience.com/environmental/high-performance-analysis-of-pahs-in-air-by-td-gc-ms) ### [Improve your characterisation of VOC and SVOC compounds](https://blog.sepscience.com/environmental/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... [Read More](https://blog.sepscience.com/environmental/improve-your-characterisation-of-voc-and-svoc-compounds) ### [A method validation and field study for the determination of trace-level phthalate esters in air using TD–GC–MS](https://blog.sepscience.com/environmental/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.  [Read More](https://blog.sepscience.com/environmental/a-method-validation-and-field-study-for-the-determination-of-trace-level-phthalate-esters-in-air-using-td-gc-ms) ### [How to achieve faster semivolatiles analysis with a scaled-down method and GC accelerator kit](https://blog.sepscience.com/environmental/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.... [Read More](https://blog.sepscience.com/environmental/how-to-achieve-faster-semivolatiles-analysis-with-a-scaled-down-method-and-gc-accelerator-kit) ### [Achieve quantitative determination of semi-volatile PCBs using TD–GC–MS](https://blog.sepscience.com/environmental/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. [Read More](https://blog.sepscience.com/environmental/achieve-quantitative-determination-of-semi-volatile-pcbs-using-td-gc-ms) ### [Using thermal desorption for the quantitative analysis of long-chain hydrocarbons](https://blog.sepscience.com/environmental/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. 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