Simultaneous determination of inorganic and organic acids in air by use of annular denuders and ion chromatography |
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Authors: | B Amati V DiPalo M Possanzini |
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Institution: | (1) Istituto sull' Inquinamento Atmosferico-CNR, Area della Ricerca di Roma, Via Salaria Km29.300-C.P.10, 00016 Monterotondo Stazione (Roma), Italy |
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Abstract: | Summary The performance of KOH-coated annular denuders for simultaneous collection of gas-phase atmospheric organic and inorganic
acids has been evaluated by ion chromatography (IC) with an NaOH−H2O gradient. Sampling efficiency was tested for formic and acetic acids under dry and humid air conditions. With this method
several mono- and dicarboxylic acids, nitric acid, and hydrogen chloride can be detected. Laboratory and field measurements
confirmed the reliability of the denuder method and its superior versatility compared with other techniques (scrubbing by
means of a nebulizer, cryogenic trapping) which cannot be used to determine termine gaseous inorganic acids. |
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Keywords: | Column liquid chromatography Ion chromatography Carboxylic acids Nitric and hydrochloric acids KOH-coated annular denuders |
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