Markes International Newsletter February
|Markes International announces instrument trade in program |
Markes International is offering an unmissable trade in program for old or discontinued thermal desorption (TD) systems, for a limited period only. TD users trading in their old systems for a new 100-tube automated TD from any authorised distributor of Markes TD technology will qualify for a half price offer on up to US$20,000 worth of Markes own-manufactured TD accessories and consumables.
Accessories available under the program include sorbent tubes, stand alone multi-tube conditioning equipment, the new Micro-Chamber/ Thermal Extractor for materials testing, sequential pumped tube samplers, alveolar breath samplers, soil probes or a combination of products.
This trade in deal gives users and their laboratories the perfect opportunity to upgrade to high performance, high productivity TD technology and take advantage of the latest developments in air monitoring and TD accessories at the same time.
Automated thermal desorption systems available from Markes International under this scheme include ULTRA-UNITY, ULTRA 50:50 and the AutoSecureTD. All the systems are cryogen-free and fully compliant with international standard methods for TD-GC(MS) analysis. They also offer the following unique advantages:
- Quantitative sample re-collection of both primary and secondary split for repeat analysis / method validation (SecureTD-Q™).
- Ability to analyse both high boiling and thermally labile compounds on the same instrument
- Mechanical reliability (no capping/un-capping) and improved tube seals to maintain sample integrity (no artefact ingress or analyte loss)
Click here for further details
The µ-CTE™ system comprises six micro-chambers which allow surface or bulk emissions to be tested from up to six samples simultaneously. The µ-CTE is compatible with industry standard sorbent tubes; adaptors are also available for non-standard 6 mm O.D. sorbent tubes and aldehyde (DNPH) cartridges, with 4 mm O.D. ends.
(S)VOC vapours are swept from the sample material in the micro-chamber and onto the attached sorbent tubes which are then thermally desorbed and analysed by GC(-MS) as per international standard methods. (Formaldehyde and other carbonyls are measured using alternative sampling and analytical procedures).
The thermal desorption analytical process is carried out off-line allowing a fresh set of samples to be introduced to the µ-CTE while analysis of vapours emitted by the previous set of samples is being performed.
Permeability is tested, typically at ambient or near ambient temperatures, using a special, proprietary permeation accessory for the Markes μ-CTE device. A small droplet of test compound is first placed in a well at the bottom of the permeation accessory. Then a sample of the test material is stretched over the top and sealed around the perimeter as shown in the top photograph opposite. The test material does not come into direct contact with the test compound. The complete assembly is then placed inside one of the μ-CTE micro-chambers. Permeation of the test compound through the stretched material is assessed by monitoring the air exhausting from the micro-chambers using sorbent tubes and TD-GCMS analysis in the normal way.
To request further information on the Permeation Accessory for the Micro-Chamber / Thermal Extractor (μ-CTE) please click here.
Stack gases: The requirement for a “double split” method.
As highlighted in the last Markes eNewsletter, 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 they allow re-collection of double split methods - i.e. The split can be re-collected both from primary (tube) desorption and secondary (cold trap) desorption. Such ‘double split’ methods are essential for high concentration analyses such as measuring residual solvents or monitoring stack gases (shown). In all such cases re-collection of both splits is required for method and data validation.
A new technical note is available for stack gas analysis (TDTS77). Please click here for further information.
|Personnel News |
Markes International is pleased to welcome Dr. Damien Rosser to the team as a development support specialist. Damien read industrial and environmental chemistry at Essex University and gained his PhD in environmental analytical chemistry from Aberdeen University. He brings with him a wealth of experience from the environmental sector, having formerly established an air quality monitoring network in Aberdeen and, most recently, been employed as a technical advisor in air quality modeling and assessment by the UK Environment Agency.
Markes International is also delighted to report the newest “member to the team”. On December 20, 2006 Lesley Hollinshead from our admin department gave birth to a son, Luke. I am sure that you will wish to join with us and wish Lesley, her husband Mark, and new addition, Luke, the very best for the future.
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