title: Assessment of Groundwater Quality by Chemometrics.
abstract: Chemometric methods were used to analyze large data sets of groundwater quality from 18 wells supplying the central drinking water system of Larissa city (Greece) during the period 2001 to 2007 (8.064 observations) to determine temporal and spatial variations in groundwater quality and to identify pollution sources. Cluster analysis grouped each year into three temporal periods (January-April (first), May-August (second) and September-December (third). Furthermore, spatial cluster analysis was conducted for each period and for all samples, and grouped the 28 monitoring Units HJI (HJI=represent the observations of the monitoring site H, the J-year and the period I) into three groups (A, B and C). Discriminant Analysis used only 16 from the 24 parameters to correctly assign 97.3% of the cases. In addition, Factor Analysis identified 7, 9 and 8 latent factors for groups A, B and C, respectively.
authors.affiliation: Clinical Chemistry - Biochemistry Section, Department of Medical Laboratories, Education & Technological Institute of Thessaly, 41110 Larissa, Greece.
authors.forename: Agelos
authors.initials: A
authors.lastname: Papaioannou
authors.forename: George
authors.initials: G
authors.lastname: Rigas
authors.forename: Sotiria
authors.initials: S
authors.lastname: Kella
authors.forename: Filotheos
authors.initials: F
authors.lastname: Lokkas
authors.forename: Dimitra
authors.initials: D
authors.lastname: Dinouli
authors.forename: Argiris
authors.initials: A
authors.lastname: Papakonstantinou
authors.forename: Xenofon
authors.initials: X
authors.lastname: Spiliotis
authors.forename: Panagiotis
authors.initials: P
authors.lastname: Plageras
mesh_terms: D004784:Environmental Monitoring / Q000379:methods*; D006115:Greece; D060587:Groundwater / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*; D060753:Water Quality; D060986:Water Wells
chemical_list: D014874:Water Pollutants, Chemical