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Environmental Pollution 114 (2001) 313±324 www.elsevier.com/locate/envpol multivariate statistical and GIS-based fervency to identify toilsome metal sources in alters A. Facchinelli, E. Sacchi *, L. Mallen Á Dipartimento di Scienze Mineralogiche e Petrologiche, Universita di Torino, Via Valperga Caluso 35, 10125 Torino, Italy unbent 25 August 2000; accepted 5 December 2000 ``Capsule: variable statistics and GIS were successful in identifying heavy metal sources on a regional scale. Abstract The knowledge of the regional variability, the background nourish and the anthropic vs. graphic origin for potentially harmful elements in soils is of critical importance to assess human impact and to ®x guide value and quality standards. The present take on was undertaken as a preliminary survey on soil taint on a regional scale in Piemonte (NW Italy). The aims of the study were: (1) to determine average regional concentrations of some heavy metals (Cr, Co, Ni, Cu, Zn, Pb ); (2) to ®nd out their large-scale variability; (3) to de®ne their natural or arti®cial origin; and (4) to identify possible non-point sources of contamination.

Multivariate statistic approaches (Principal segment outline and Cluster Analysis) were adopted for information treatment, allowing the identi®cation of three main(prenominal) factors arbitrary the heavy metal variability in cultivated soils. Geostatistics were employ to construct regional distribution maps, to be compared with the geographical, geological and republic use regional database using GIS software. This approach, evidencing spatial relationships, proved rattling useful to the con®rmation and re®nement o f geochemical interpretations of the statist! ical output. Cr, Co and Ni were associated with and controlled by parent rocks, whereas Cu together with Zn, and Pb alone were controlled by anthropic activities. The study indicates that background values and hardheaded mandatory guidelines are impossible to ®x without an all-inclusive data collection and...If you want to get a spacious essay, assemble it on our website: OrderEssay.net

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