Reliability in determination of methanol concentration.
Two sampling methods for reliable determination of methanol concentration were studied. Methanol vapor stored in glass container was found to be decomposed on the glass surface. The decomposition increased as the surface area of the glass container was extended. The proportion of the decomposition in the glass container was relatively high, especially when the concentration of methanol vapor was low. Therefore, a reliable determination by the above sampling method was impossible. In the solid sorbent sampling by silica gel, the collected methanol was also decomposed, but the decomposed amount was negligibly small compared to the collected methanol when the amount of methanol was more than 0.1 microliter of the liquid methanol. It could be concluded from the foregoing findings that the determination of methanol concentration by this method is reliable.
D000395:Air Pollutants, Occupational / Q000032:analysis*; D000432:Methanol / Q000032:analysis*; D008722:Methods
D000395:Air Pollutants, Occupational; D000432:Methanol