Abstract
Abstract A method for the determination of low-molecular-mass carboxylic acids in air is reported. The method is based on impinger sampling in sodium hydroxide, selective enrichment across a liquid membrane and determination by ion-exclusion chromatography. The membrane enrichment is carried out in an automated continuous-flow system coupled to the chromatographic column. By impregnation of the membrane with 10% tri- n -octylphosphine oxide in di- n -hexyl ether, extraction efficiencies in the range 30–100% for C 1 –C 4 , carboxylic acids were achieved. Formic and acetic acid were measured in the range 17–300 nmol/m 3 and some other carboxylic acids were detected in air samples taken in southern Sweden.
Published Version
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