Developing a new aldehyde passive solid sorbent samnpler.
Tasi-SW; Que Hee-SS
American Industrial Hygiene Conference and Exposition, May 20-26, 1995, Kansas City, Missouri. Fairfax, VA: American Industrial Hygiene Association, 1995 May; :38
The aim of this research was to develop a new aldehyde passive sampler for personal sampling in the environmental/ industrial hygiene field. O-(2,3.4,5.6.pen(afIuorobenzyl)hydroxylamine hydrochloride (PFBHA) has been used to analyze aldehydes in water because of its fast quantitative reaction to form oximes suitable for sensitive detection at the picogram (pg) level by gas chromatography/mass spectrometry (GC/MS) and gas chromatography/electron capture detection (GC/ECD). It has also been used in a dynamic air sampling method in our laboratory. A 13 mm diameter pellet made from PFBHA coated Tenax GC (10%, w/w) was made by a hand press. The sampler has a silicone membrane on top and a diffusion path length of 1.1 cm. The sampling constant was determined by exposures to different vapor concentrations and face velocities. Valeraldehyde vapors of known concentrations about the PEL were generated by using a syringe pump at a constant injection rate to introduce liquid aldehyde into the pure air stream from an air compressor before delivery into the exposure chamber. The PFBHA-standard method (reference: decafluorobiphenyl) by selected ion monitoring at m/z 181. The ppm-hour exposure conditions were equivalent to 0, 0.25, 0.5, 1.5, and 2 times the PEL for 8 hours. The face velocities ranged from 20 to 70 fpm and the relative humidities ranged from 34% to 38%. The masses collected were independent of face velocity. This was not so without the membrane. The experimental sampling rate of this sampler at these conditions was found to be 4.51+/-0.15 mL/min. The results showed that this is a feasible method for aldehyde passive sampling.
Air-monitoring; Air-samplers; Air-sampling; Air-sampling-equipment; Air-sampling-techniques; Environmental-exposure; Laboratory-techniques; Laboratory-testing; Quantitative-analysis; Sampling; Sampling-methods; Spectrographic-analysis; Vapors
American Industrial Hygiene Conference and Exposition, May 20-26, 1995, Kansas City, Missouri
University of California Los Angeles, Los Angeles, CA