eprintid: 13459 rev_number: 8 eprint_status: archive userid: 353 dir: disk0/00/01/34/59 datestamp: 2016-07-28 13:12:15 lastmod: 2021-08-27 17:27:30 status_changed: 2016-07-28 13:12:15 type: article metadata_visibility: show item_issues_count: 1 creators_name: Kajino, M. creators_name: Winiwarter, W. creators_name: Ueda, H. creators_id: 1775 creators_orcid: 0000-0001-7131-1496 title: Modeling retained water content in measured aerosol mass ispublished: pub divisions: prog_air divisions: prog_mag keywords: Aerosol water; Drying operation; Mass transfer approach; Multi-component equilibrium model; Sampling artifacts; Semi-empirical and theoretical approaches abstract: The contribution of liquid water to measured aerosol mass was estimated using a numerical approach applied to European measurement data. Aerosol mass is determined after conditioning of the filter under dry conditions for a predefined period according to a standard procedure. After this procedure, water in aerosols is assumed to be at very low concentrations. However, we find indications that the equilibrium of aerosol is not fully established and water is not completely evaporated after the drying operation. To estimate the aerosol humidity, a mass transfer coefficient was derived for evaporation from the filters. Data from a few available measurements of aerosol humidity were applied with a numerical kinetic approach, using thermodynamic equilibrium as boundary conditions. The calculated coefficient ranged from 10-5 to 10-4 (s-1), with an average value of 3.2×10-5 s-1. Using this average value the expected water content of aerosol was assessed for sites in Austria. Most of the samples are expected to still contain 1-5% water. In winter, the air is humid and the concentration of inorganic hygroscopic compounds is also high, resulting in high uptake of water from the air. Under such conditions, approximately 70% of unidentified non-carbonaceous components, or about 10% of PM2.5 mass, were considered to be water. date: 2006-09 date_type: published publisher: Elsevier id_number: 10.1016/j.atmosenv.2006.04.016 creators_browse_id: 335 full_text_status: none publication: Atmospheric Environment volume: 40 number: 27 pagerange: 5202-5213 refereed: TRUE issn: 13522310 coversheets_dirty: FALSE fp7_project: no fp7_type: info:eu-repo/semantics/article citation: Kajino, M., Winiwarter, W. ORCID: https://orcid.org/0000-0001-7131-1496 , & Ueda, H. (2006). Modeling retained water content in measured aerosol mass. Atmospheric Environment 40 (27) 5202-5213. 10.1016/j.atmosenv.2006.04.016 .