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Simultaneous determination of formic acid and lower carbonyls in air samples by DNPH derivatization
Author(s) -
Possanzini Massimiliano,
Tagliacozzo Giorgio,
Cecinato Angelo
Publication year - 2007
Publication title -
journal of separation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.72
H-Index - 102
eISSN - 1615-9314
pISSN - 1615-9306
DOI - 10.1002/jssc.200700109
Subject(s) - derivatization , formic acid , chromatography , chemistry , high performance liquid chromatography
The classical derivatization method of carbonyls based on 2,4‐dinitrophenylhydrazine (DNPH)‐coated silica cartridges was tested to concurrently measure lower carbonyls and carboxylic acids in air samples. The performance of these cartridges with respect to formic and acetic acids was evaluated in a number of laboratory measurements on collection and reaction efficiencies. The results showed that HCOOH appeared to have been efficiently collected and derivatized (at 80°C for 8 h) up to air‐flow rates of 350 mL/min, while CH 3 COOH was almost completely lost from the cartridge above 100 mL/min. Also due to the high LOD of HCOOH (0.8 μg/m 3 ) for 120 L of air sampled during 8 h, the DNPH method might be used only in indoor environments polluted by formic acid as well as carbonyls.