A new passive sampler for regulated workplace ketones.
A new solid sorbent passive air sampler for ketones has a silicone membrane atop a diffusion cylindrical path length of 1.1 cm and diameter 1.3 cm above a pellet of Tenax TA coated with 10% (w/w) O-(2,3,4,5,6-pentafluorobenzyl)hydroxylamine hydrochloride. Vapors of known concentrations approximating their workplace permissible exposure limits of Occupational Safety and Health Administration-regulated ketones at a relative humidity (RH) of 3 +/- 1% were generated by a syringe pump connected to a dynamic air dilution system connected to an exposure chamber that allowed measurement of face velocities, temperatures, exposing vapor concentrations, and RHs. The O-oxime derivative was desorbed with hexane, and an aliquot injected for gas chromatographic analysis on a nonpolar capillary column by mass spectrometric or electron capture detection. The experimental passive sampler sampling rates in milliliters per minute at 25 degrees C were 4.07 +/- 0.49, cyclohexanone; 6.30 +/- 0.59, diethyl ketone; 6.31 +/- 0.31, ethyl n-butyl ketone; 3.78 +/- 0.25, methyl n-amyl ketone; 3.43 +/- 0.19, methyl n-butyl ketone; 6.48 +/- 0.64, methyl ethyl ketone; 4.37 +/- 0.43, methyl isopropyl ketone; and 4.57 +/- 0.17, methyl n-propyl ketone. These preliminary data show that sterically unhindered ketones can be sampled by the passive sampler as well as aldehydes.
Tsai
S W
SW
Department of Environmental Health Sciences and UCLA Center for Occupational and Environmental Health, UCLA School of Public Health, Los Angeles, CA 90095-1772, USA.
Hee
S S
SS
D002849:Chromatography, Gas / Q000379:methods; D006801:Humans; D007659:Ketones / Q000032:analysis*; D013058:Mass Spectrometry / Q000379:methods; D008452:Maximum Allowable Concentration; D016273:Occupational Exposure / Q000032:analysis*; D014481:United States; D014489:United States Occupational Safety and Health Administration; D017132:Workplace
D007659:Ketones