title: Chemical composition of water from roofs in Gdansk, Poland.
abstract: This study deals with the assessment of roof runoff waters from the region of Gdansk collected during the winter season (2007/2008). The chemical analysis includes 16 chemical variables: major ions, PAHs and PCBs measured at 3 sampling sites for 6-14 rain events. Although the data set is of limited volume the statistical data treatment using self-organizing maps (SOM) reveals the main factors controlling roof runoff water quality even for a data set with small dimension. This effort for explanation of the identified factors by the possible emission sources of the urban environment and air-particulate formation seems to be very reliable. Additionally to the roof runoff water quality factors the rain events patterns are found: "background" group of events and groups formally named "PAHs", "PCBs" and "air-borne particles"--dominated events. The SOM classification results give an opportunity to uncover the role of roof "impact" on the runoff waters. Rain runoff water quality is described by four latent factors and the "roof" impact is uncovered.
authors.affiliation: Chair of Physical Chemistry, Faculty of Chemistry, University of Sofia, J Bourchier Blvd. 1, 1164 Sofia, Bulgaria. stsakovski@chem.uni-sofia.bg
authors.forename: Stefan
authors.initials: S
authors.lastname: Tsakovski
authors.forename: Marek
authors.initials: M
authors.lastname: Tobiszewski
authors.forename: Vasil
authors.initials: V
authors.lastname: Simeonov
authors.forename: Zaneta
authors.initials: Z
authors.lastname: Polkowska
authors.forename: Jacek
authors.initials: J
authors.lastname: Namieśnik
mesh_terms: D004784:Environmental Monitoring; D011044:Poland; D011078:Polychlorinated Biphenyls / Q000032:analysis; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis; D014867:Water / Q000737:chemistry*; D014872:Water Movements; D014874:Water Pollutants, Chemical / Q000032:analysis
chemical_list: D011084:Polycyclic Aromatic Hydrocarbons; D014874:Water Pollutants, Chemical; D014867:Water; D011078:Polychlorinated Biphenyls