New analytical method for determining formaldehyde in aqueous samples.
Tso-JC; Que Hee-S
American Industrial Hygiene Conference and Exposition, May 9-15, 1998, Atlanta, Georgia. Fairfax, VA: American Industrial Hygiene Association, 1998 May; :15
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 a need to have a method that can be utilized to analyze trace amounts of aldehydes, particularly in groundwater from hazardous waste sites and waste streams after oxidation or combustion treatments. The reagent 0-(2,3,4,5,6-pentafluorophenyl) methylhydroxylamine 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 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 Iv) PFBHA aqueous solution at a flow rate of 0.5 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 and gas chromatography/ mass spectrometry using a nonpolar capillary column. The capacity of PFBHA in the SCX cartridge was 80 mmole/0.38 g (210 mmole/g sorbent). The recoveries of formaldehyde in the concentration range 3B30 ppm were >83%. This method is suitable for field sampling.
Airborne-particles; Air-contamination; Air-monitoring; Air-quality-measurement; Air-samplers; Air-samples; Air-sampling; Air-sampling-equipment; Air-sampling-techniques; Carcinogens; Chromatographic-analysis; Exposure-assessment; Exposure-levels; Gas-chromatography; Laboratory-testing; Mathematical-models; Quantitative-analysis; Sampling-methods; Standards; Water-analysis; Water-industry; Water-sampling
Research Tools and Approaches: Exposure Assessment Methods
American Industrial Hygiene Conference and Exposition, May 9-15, 1998, Atlanta, Georgia
University of California Los Angeles, Los Angeles, CA