Chinese Drywall Testing and Analysis Services
Air and Headspace Analysis – Considerations regarding 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.
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.