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 Using
accepted analytical methods, superior
instrumentation and Centek supplied user
friendly sampling equipment, we can
analyze for suspected compounds causing
contamination (total VOC’s, sulfur
species). This represents a cost
efficient, increased sensitivity
approach to fulfilling your analytical
needs.
Contact us to set up a meeting/
presentation via web conference, over
the phone, or face to face. Our
experienced laboratory director, Russ
Pellegrino, will assist in developing a
sampling program.
Article
links as reported by:
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CHINESE
DRYWALL:
Centek Labs, a leader in
sampling and analysis
of contaminated drywall
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 CHINESE
DRYWALL:
Air
and Headspace Analysis; The Importance
of Sampling Media and Environmental
Conditions During Sampling and Analysis
Tedlar Bags -vs- Treated Canisters
What is the
most accurate sampling media and why?
The graphs on the left compare data from
a number of different media used to
sample sulfur compounds in air.
The tedlar
bags and treated canister were spiked at
50 ppb. Over a period of time the media
was analyzed to watch stability and
reproducibility. Data shows the
pretreated quartz coated canister
negates the sulfur compounds from
adhering. Thus, making the canister
media the most reliable media, relevant
to detecting sulfur compounds in the
matrix.
Conclusion
If you were
to look at the tedlar media under a
microscope, you would see that the
surface is not smooth. In fact it would
have tiny scratches throughout the
material. Centek also know that sulfur
compounds are very sticky. Sulfur
compounds have a tendency to stick
inside the tedlar bag because of active
sites. Canisters with specially treated
quartz coatings when examined under a
microscope, show a surface that is very
smooth, much like glass.
Headspace Analysis
 Progress
of research to best identify sulfur
contamination
-
Analyze
whole piece of drywall as is
-
Increase
surface area by pulverizing sample
-
Subject
sample to increased temperature
-
Subject
sample to increased humidity
Conclusion
Centek was able
to produce the best results when
subjecting
drywall samples to increased surface
area, temperature
and humidity
Environmental Conditions
 Theory
Using what
we know about sulfur compound collection
and analysis, sampling media and
environmental conditions play a huge
role in being able to identify
contamination in air and drywall
products. It is my belief that analysis
can be consistent if sampling and
analysis are subjected to a stringent
protocol.
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