Certified Reference Standards Brochure0 pages

Environmental air monitoring?
Industrial / occupational hygiene?
Direct thermal desorption of materials?
Calibration / quality assurance (QA) standards
meeting the requirements of your thermal
desorption application are now available from
Markes International (Mi™).
• Certified traceable to primary standards
• Wide choice of volatile organic compounds
from 10ng to 100ìg - good for both trace level
environmental tests and for QA/QC of
concentrated materials.
• Little incremental expense versus
commercial prepacked / conditioned tubes
• Minimum 6 month shelf life
Routine certified standards from Markes
International are prepared by the direct
introduction of known volumes of standard
atmospheres into individually labelled 3½-inch
(89mm) by ¼-inch (6.4mm) O.D. stainless steel
sorbent tubes. Analyte masses are accurate to
±3% at levels above 100ng and at ±5% for masses
from 10 - 100ng.
Benzene, toluene and o-xylene (BTX) standards
on Tenax-TA® are available at both 25ng and 1ìg
levels. A TO-17 Standard™ on Tenax-TA® -
comprising 25ng each of CH2Cl2, 1,1,1-
trichloroethane, 1,2,4-trimethylbenzene, methyl-tbutyl
ether (MtBE), butanol, ethyl acetate and
methylethyl ketone (MEK) - is also available. The
wide polarity and volatility range of analytes
included in this standard make it ideal for QA of
general purpose ambient air monitoring methods
such as US EPA TO-17.
Custom certified standards can be prepared to
your specification containing up to six volatile
organic compounds.
Certification
Routine Mi standards are prepared at leading
European national standards institutes by direct
introduction of standard atmospheres.
Internationally approved methodology (ISO 6145
parts 4 & 8) is used to generate the standard
atmospheres required and each is continuously
monitored by independent on-line mass
spectrometry. Custom standards are prepared to
your specification by direct introduction of the
components in the vapour phase. All masses are
traceable to primary standards1.
Each individual package of 10 standards includes
an additional blank tube as a shipping blank, used
to confirm the integrity of the standards package.
The package documentation includes a
certification document, chromatogram of the
shipping blank, chromatogram of the components
loaded onto the tubes and user instructions.
Mi BCRS4
Certified Reference Standards for Thermal Desorption
Certified Reference Standards
Markes International Ltd
Unit D3, Llantrisant Business Park, Pontyclun, RCT, CF72 8YW, UK
Tel: +44 1443 230935 Fax: +44 1443 231531 email: enquiries@markes.com http://www.markes.com
CRS Certificate