New analytical method for determining aldehydes in aqueous samples.
Tso-JC; Que Hee-S
American Industrial Hygiene Conference and Exposition, June 5-11, 1999, Toronto, Ontario, Canada. Fairfax, VA: American Industrial Hygiene Association, 1999 Jun; :4
Carbonyl compounds (especially low molecular weight aldehydes) are receiving increasing attention in workplace air exposures and water pollution. Formaldehyde, acetaldehyde. furfural. and crotonaldehyde are known animal carcinogens. There is need to have a melhod that can be utilized to analyze trace amounts of aldehydes. particularly in ground water from hazardous waste sites and waste streams after oxidation or combustion treatments. The reagent O-(2.3.4,S.6-pentaJluorophenyl) methyl hydroxylamine hydrochloride (PFBHA) is a promising reagent to analyze carbonyl compounds. A batch method to form derivatives is the only method type for aqueous samples: however. it is time consuming. A new analytical method with solid phase extraction (SPE) has been developed by using a cation exchange cartridge to hold PFBHA ions to react with aldehyde in the aqueous sample. The cation exchange cartridge was activated by 10 mL of 0.5 M sulfuric acid and charged with 10 ml of 1% (w/v) PFBHA aqueous solution at a flow rate of I mL/min. After loading aldehyde aqueous samples and a microwave heating treatment, the oxime product was eluted from the SCX cartridge by 5 ml of hexane and analyzed qualitatively and quantitatively by gas chromatography/electron capture detection (GCIECD) and gas chromatography/mass spectrometry (GCrMS) using a nonpolar capillary column. The recovers of 20 mL formaldehyde solution in the concentration range 100 ppb-10 ppm were> 83%. This method is suitable for field sampling.
Airborne-particles; Air-monitoring; Air-quality-measurement; Air-sampling; Air-sampling-techniques; Environmental-exposure; Exposure-assessment; Gas-chromatography; Indoor-air-pollution; Indoor-environmental-quality; Laboratory-techniques; Laboratory-testing; Outdoors; Quantitative-analysis; Sampling-methods; Statistical-analysis; Vapor-detectors; Vapor-volume
Research Tools and Approaches: Exposure Assessment Methods
American Industrial Hygiene Conference and Exposition, June 5-11, 1999, Toronto, Ontario, Canada
University of California Los Angeles, Los Angeles, CA