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Intermethod comparisons of active sampling procedures and analysis of aldehydes at environmental levels
Cong-Khanh Huynh1, Trinh Vu-Duc
1IST-Institute of Occupational Health Sciences, 19 Rue du Bugnon, 1005 Lausanne, Switzerland. CongKhanh.Huynh@inst.hospvd.ch
Analytical and Bioanalytical Chemistry
|April 10, 2002
Summary
This study evaluated four aldehyde sampling techniques, finding active DNPH methods effective for formaldehyde, acetaldehyde, and acrolein at higher concentrations. However, performance decreased at lower levels, highlighting the need for improved methods for accurate air quality monitoring.
Area of Science:
- Environmental Chemistry
- Analytical Chemistry
- Atmospheric Science
Background:
- Priority aldehydes like formaldehyde, acrolein, acetaldehyde, and glutaraldehyde are significant air pollutants.
- Accurate measurement of these aldehydes is crucial for environmental and health risk assessment.
Purpose of the Study:
- To assess the suitability of four sampling techniques for priority aldehydes.
- To compare DNPH-based methods (impingers, cartridges, filters) with 2-HMP/XAD-2 tubes.
- To evaluate chemical interferences from ozone, nitrogen dioxide, and ammonia.
Main Methods:
- A European interlaboratory exercise utilized the Vito facility for controlled atmosphere generation.
- Four sampling techniques were tested: DNPH impingers, DNPH cartridges, DNPH filters, and 2-HMP/XAD-2 tubes.
- Analysis involved High-Performance Liquid Chromatography (HPLC) for DNPH derivatives and Gas Chromatography-Mass Spectrometry (GC-MS) for oxazolidine derivatives.
Main Results:
- Active DNPH methods achieved results within 30% relative uncertainty for formaldehyde, acetaldehyde, and acrolein at upper microg/m³ levels.
- Performance of DNPH methods decreased below the 30% criteria at sub-microg/m³ levels.
- Using a 'scrubber' cartridge effectively mitigated interferences from ozone and nitrogen dioxide.
Conclusions:
- Modified active DNPH methods show promise for aldehyde monitoring at higher concentrations.
- Current DNPH methods require improvement for accurate low-level aldehyde detection.
- Scrubber cartridges enhance the reliability of aldehyde sampling in the presence of interferents.