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Validation and optimization of a solid sorbent dynamic personal air sampling method for aldehydes.

Authors
Shen-Y; Que Hee-S
Source
American Industrial Hygiene Conference and Exposition, May 9-15, 1998, Atlanta, Georgia. Fairfax, VA: American Industrial Hygiene Association, 1998 May; :45
Link
NIOSHTIC No.
20039221
Abstract
A solid sorbent personal dynamic air sampling method for aldehydes using chemisorption through reaction with O-(2,3,4,5,6-pentafluorobenzyl) hydroxylamine hydrochloride (PFBHA) has been developed and several aldehydes validated. The aim of this study was to validate this method for formaldehyde, to test the influence of temperature on sampling efficiency, and also to optimize desorption efficiency. Formaldehyde is an animal carcinogen and a suspected human carcinogen. There is need for a sensitive sampling method. Vapors of known concentrations were generated in Tedlar gas bags by syringe injection of known volumes of formalin of measured formaldehyde content. Chemisorption through reaction with 20% (w /w) PFBHA on Tenax TA solid sorbent (200 mg) in a Pyrex tube (7-cm long, 7-mm OD, and 5-mm ID) occurred during collection with a personal sampling pump operated at 10 or 50 mL/ min. The oxime derivative was desorbed quantitatively (>75%) with hexane and an aliquot injected for gas chromatographic analys is on a nonpolar capillary column with 63(Ni) electron capture detection. Formaldehyde at 8 ppm-hours relative to the TLV-TWA concentration can be successfully sampled with a recovery of 94 +/- 4%. Valeraldehyde and acrolein at their TLV-TWAs H 8 hours showed no significant differences (P<0.05) between the recoveries at different relative humidities (1 and 90%) and sampling temperatures (1, 25, and 401C). The critical time for desorption was 30 minutes with occasional shaking or 2 minutes for vigorous manual shaking. The desorption efficiency for valeraldehyde is 88 +/- 2%, and the desorption efficiency for acrolein is 100 +/- 3%.
Keywords
Airborne-particles; Air-monitoring; Air-quality-measurement; Air-sampling; Air-sampling-equipment; Air-sampling-techniques; Carcinogens; Exposure-assessment; Laboratory-testing; Mathematical-models; Quantitative-analysis; Sampling-methods; Standards; Vapor-detectors
Publication Date
19980509
Document Type
Abstract
Funding Amount
515055
Funding Type
Grant
Fiscal Year
1998
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-003120
Priority Area
Research Tools and Approaches: Exposure Assessment Methods
Source Name
American Industrial Hygiene Conference and Exposition, May 9-15, 1998, Atlanta, Georgia
State
CA
Performing Organization
University of California Los Angeles, Los Angeles, CA
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