Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/16672
Title: Unsuitability of using the DNPH-coated solid sorbent cartridge for determination of airborne unsaturated carbonyls
Authors: Ho, SSH
Ho, KF
Liu, WD
Lee, SC 
Dai, WT
Cao, JJ
Ip, HSS
Keywords: Acrolein
Crotonaldehyde
DNPH cartridge
HPLC
Methacrolein
Methyl vinyl ketone
Unsaturated carbonyls
Issue Date: 2011
Publisher: Pergamon-Elsevier Science Ltd
Source: Atmospheric environment, 2011, v. 45, no. 1, p. 261-265 How to cite?
Journal: Atmospheric Environment 
Abstract: Measurements of aldehydes and ketones are typically conducted by derivatization using sorbent cartridges coated with 2,4-dinitrophenylhydrazine (DNPH). The collected samples are eluted with acetonitrile and analyzed by high-pressure liquid chromatography coupled with an ultra-violet detector (HPLC/UV). This paper intends to examine artifacts about its suitability in identification of unsaturated carbonyls. Kinetic tests for acrolein, crotonaldehyde, methacrolein and methyl vinyl ketone (MVK) showed formations of carbonyl-DNP-hydrazone during sampling, which could further react with DNPH, resulting in undesired UV absorption products [e.g., carbonyl-DNP-hydrazone-DNPH (dimer) and 2(carbonyl-DNP-hydrazone)-DNPH (trimer)]. The dimerization and trimerization occurred for acrolein and MVK whereas only dimerization for crotonaldehyde and methacrolein. The polymerization products undoubtedly affect the integrity of the chromatogram, leading to misidentification and inaccurate quantification. Whether precautions taken during sampling and/or sample treatment could avoid or minimize this artifact has not been thoughtfully investigated. More often, such artifacts are usually overlooked by scientists when the data are reported.
URI: http://hdl.handle.net/10397/16672
DOI: 10.1016/j.atmosenv.2010.09.042
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