This badge collects the following:
Methanol (Methyl Alcohol)
Q: Why did Assay Technology make a badge specifically for methanol?
A: Over long sampling times, methanol can diffuse off carbon media, which is why we’ve always recommended using the 566 badge for no longer than 15 minutes of methanol sampling. Developing a new badge allowed us to utilize media and an analytical method that were best for methanol, without needing to worry about any other chemicals. The 545 badge uses a form of carbon which binds small molecules more tightly, and we can use the strong solvent N,N-Dimethyl Formamide to move our methanol recoveries from 72.9% to over 99%. This solvent blocks much of the chromatogram, making the recovery of many other chemicals impossible.
Q: Can the 545 badge be used for 8-hour (TWA) and 15-minute (STEL) methanol sampling?
A: Yes! Click the “Use For” tab to see reporting limits.
Q: Can I still use the Assay 546 and 566 badges for 8-hour and 15-minute methanol sampling?
A: Considering the superior performance of the new badge in regard to both desorption efficiency and reverse diffusion, we believe customers should change over as soon as possible. However, we will still offer methanol analysis on the 546 and 566 for a limited time.
Q: What other chemicals can the 545 badge be used for?
A: Currently, we haven’t validated the 545 for any other chemicals. However, we are working on several additions, including ethanol and isopropyl alcohol.
Q: What is G-BAC media?
A: G-BAC is a petroleum-based, Bead-shaped Activated Carbon.
Q: Why does the 545 use a petroleum-based carbon instead of the typical coconut shell charcoal?
A: The petroleum-based G-BAC carbon is better at binding small oxygenated molecules, greatly reducing the reverse diffusion of methanol over long sampling times.