Markes International Newsletter November 2006
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Toxic Chemicals in Air and Materials: New Application Guides to Simplify and Enhance Measurement
For your free copies please email your request to enquiries@markes.com or call on +44 (0)1443-230935.
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Markes International has just published a series of four practical application guide booklets showing how thermal desorption (TD) can benefit real-world GC(MS) applications. With nearly 100 TD application examples in total, the booklets are broken into four specific fields of interest:
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Automated re-collection with single thermal desorption (TD) autosampler - Patent granted to Markes International In April of this year Markes announced that its application for a UK patent on automated re-collection for thermal desorption using a single TD autosampler had been granted. The new patent has a priority date of 13/11/02 and is reference number GB2395785. Pioneered by Markes International Limited in 1998, quantitative re-collection of TD samples (SecureTD-Q) has set a new benchmark for analytical thermal desorption technology. SecureTD-Q allows repeat analysis and validation of TD methods / data as referenced in international standard methods such as ASTM D 6196-03. The new Markes patent covers both automated re-collection onto clean, conditioned tubes and re-collection back onto the original sample tube using the same TD autosampler. Granting of this patent confirms Markes position as the world’s premier provider of innovative, high-performance concentration and thermal desorption technology. Markes systems are in use in key industrial, regulatory and research labs around the globe. Key applications include: air monitoring for environmental health and safety, monitoring trace level chemical warfare agents for defence and counter terrorism, food/flavour/fragrance profiling and materials quality control – including emissions testing.
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Markes application team grows Markes is please to welcome Dr. Claire Evans to the ever expanding team of thermal desorption applications support staff. Claire read Forensic & Analytical Chemistry at Strathclyde University and gained her PhD from Bristol University in the field of Environmental Organic Geochemistry. “With her experience in both forensic and environmental analytical chemistry Claire will be an invaluable asset to the applications team” said Matt Bates, Technical Manager. “Markes’ large team of application support specialists puts the company in a unique position to offer its customers the very best technical and TD applications support” said Bates.
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Application Feature: Semi-volatiles to thermally labile species – analysed at the same time on one system The new application booklet “Environmental Air Monitoring and Occupational Health and Safety” covers applications ranging from global pollution background studies to industrial emissions and from personal exposure monitoring to landfill odour. Markes’ UNITY-based thermal desorption systems are unique in that both semi-volatile compounds, such as 5- and 6-ring PAHs (including benzo-a-pyrene), and labile species, such as mercaptans, can all be analysed at the same time all on the same TD platform. Markes (ULTRA)-UNITY TD offers quantitative recovery of compounds up to n-C40 (b.p. >550 ºC) and allows the selection of low flow path temperatures (<100 ºC) for compatibility with reactive analytes such as thiols (mercaptans) and CS gas. Markes UNITY-Air Server systems, for on-line monitoring and canister / bag analysis, are also compatible with labile sulphur compounds (see TDTS32) and volatile analytes such as acetylene and freons.
 Chromatogram of 100 ml landfill gas with trace target analytes and many major components identified |
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