Comparing field performances of denuder techniques in the high Arctic

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• 作者：Antonietta Ianniello ; Harry J. Beine ; Matthew S. L ; is ; Robert K. Stevens ; Giulio Esposito ; Antonio Amoroso ; Ivo Allegrini
• 关键词：Arctic ; Atmospheric chemistry ; Annular denuder ; Multi-channel denuder
• 刊名：Atmospheric Environment
• 出版年：2007
• 期刊代码：11_13522310
• 类别：env
• 出版时间：March 2007
• 卷：41
• 期：8
• 页码：1604-1615
• 文件大小：362 K

摘要

A field evaluation between two annular denuder configurations was conducted during the spring of 2003 in the marine Arctic at Ny-Ålesund, Svalbard. The IIA annular denuder system (ADS) employed a series of five single-channel annular denuders, a cyclone and a filter pack to discriminate between gas and aerosol species, while the EPA-Versatile Air Pollution Sampler (VAPS) configuration used a single multi-channel annular denuder to protect the integrity of PM_2.5 sample filters by collecting acidic gases. We compared the concentrations of gaseous nitric acid (HNO₃), nitrous acid (HONO), sulfur dioxide (SO₂) and hydrochloric acid (HCl) measured by the two systems. Results for HNO₃ and SO₂ suggested losses of gas phase species within the EPA-VAPS inlet surfaces due to low temperatures, high relative humidities, and coarse particle sea-salt deposition to the VAPS inlet during sampling. The difference in HNO₃ concentrations (55%) between the two data sets might also be due to the reaction between HNO₃ and NaCl on inlet surfaces within the EPA-VAPS system. Furthermore, we detected the release of HCl from marine aerosol particles in the EPA-VAPS inlet during sampling contributing to higher observed concentrations. Based on this work we present recommendations on the application of denuder sampling techniques for low-concentration gaseous species in Arctic and remote marine locations to minimize sampling biases. We suggest an annular denuder technique without a large surface area inlet device in order to minimize retention and/or production of gaseous atmospheric pollutants during sampling.