Unsuitability of using the DNPH-coated solid sorbent cartridge for determination of airborne unsaturated carbonyls

被引:59
作者
Ho, Steven Sai Hang [1 ,2 ]
Ho, K. F. [1 ]
Liu, W. D. [3 ]
Lee, S. C. [3 ]
Dai, W. T. [1 ]
Cao, J. J. [1 ]
Ip, H. S. S. [2 ]
机构
[1] Chinese Acad Sci, SKLLQG, Inst Earth Environm, Xian 710075, Peoples R China
[2] Hong Kong Premium Serv & Res Lab, Chaiwan, Hong Kong, Peoples R China
[3] Hong Kong Polytech Univ, Res Ctr Urban Environm Technol & Management, Dept Civil & Struct Engn, Kowloon, Hong Kong, Peoples R China
关键词
Unsaturated carbonyls; DNPH cartridge; HPLC; Acrolein; Crotonaldehyde; Methacrolein; Methyl vinyl ketone; ALDEHYDES; DERIVATIZATION;
D O I
10.1016/j.atmosenv.2010.09.042
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
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. (C) 2010 Elsevier Ltd. All rights reserved.
引用
收藏
页码:261 / 265
页数:5
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