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Issue 4, 2014
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Biases in ketone measurements using DNPH-coated solid sorbent cartridges

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Abstract

Biases associated with carbonyl measurement using active air sampling through a 2,4-dinitrophenylhydrazine (DNPH)-coated solid sorbent cartridge following the U.S. EPA Method TO-11A are known but have not been fully investigated. Ketones are less reactive than aldehydes in the derivatization with DNPH, resulting in poor collection efficiency. Field studies and laboratory experiments demonstrate the uncertainties associated with two ketones (i.e., acetone and methyl ethyl ketone [MEK]). Ketone collection efficiencies are inversely related to relative humidity (RH), sample flow rate, and sample duration. Since water is a product in the bidirectional derivatization of carbonyls, the reverse reaction competes with the forward reaction as RH increases. Laboratory experiments demonstrate that ∼35–80% of the ketones can be lost for RH > 50% with a single DNPH cartridge at a temperature of 22 ± 2 °C. Optimal sampling flow rates and sampling durations under high RH need to be determined in various environments to ensure tolerable collection efficiencies.

Graphical abstract: Biases in ketone measurements using DNPH-coated solid sorbent cartridges

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Article information


Submitted
20 Sep 2013
Accepted
16 Dec 2013
First published
17 Dec 2013

Anal. Methods, 2014,6, 967-974
Article type
Communication
Author version available

Biases in ketone measurements using DNPH-coated solid sorbent cartridges

S. S. H. Ho, J. C. Chow, J. G. Watson, H. S. S. Ip, K. F. Ho, W. T. Dai and J. Cao, Anal. Methods, 2014, 6, 967
DOI: 10.1039/C3AY41636D

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