Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | Natural background level assessment in groundwaters: probability plot versus pre-selection method |
| Abstract | The need for a sound methodology to establish a formal value separating natural geochemical background levels in groundwaters from the anthropogenic impact, is perceived especially from a legal point of view. In this research we compare the natural background levels derived for As, F, Mn and Fe in a volcanic-sedimentary aquifer in Central Italy, using probability plots and pre-selection methods. The derived values may differ by even two orders of magnitude for strongly skewed distributions. Results show that both methods have a degree of subjectivity, however the integration of the two methods reinforces the validity of the assessment. Critical issues include statistical data distribution choice, minimum population size, distance of the sampling sites from anthropized areas. Pre-selection methods appear more robust than probability plots when the hydrogeological asset is duly considered. The greater importance of the aquifer conceptual model of the system, than the choice of a statistical method, is pointed out. (C) 2014 Elsevier B.V. All rights reserved. |
| Source | Journal of geochemical exploration 143, pp. 43–53 |
| Keywords | Geochemical backgroundAquiferArsenicManganesePollutionThreshold value |
| Journal | Journal of geochemical exploration |
| Editor | Elsevier, Amsterdam, Paesi Bassi |
| Year | 2014 |
| Type | Articolo in rivista |
| DOI | 10.1016/j.gexplo.2014.03.015 |
| Authors | Preziosi, Elisabetta; Parrone, Daniele; Del Bon, Andrea; Ghergo, Stefano |
| Text | 298385 2014 10.1016/j.gexplo.2014.03.015 ISI Web of Science WOS 000338393400004 Geochemical background Aquifer Arsenic Manganese Pollution Threshold value Natural background level assessment in groundwaters probability plot versus pre selection method Preziosi, Elisabetta; Parrone, Daniele; Del Bon, Andrea; Ghergo, Stefano CNR IRSA, National Research Council Water Research Institute, Via Salaria km 29,300, PB 10, 00015 Monterotondo, Rome, Italy The need for a sound methodology to establish a formal value separating natural geochemical background levels in groundwaters from the anthropogenic impact, is perceived especially from a legal point of view. In this research we compare the natural background levels derived for As, F, Mn and Fe in a volcanic sedimentary aquifer in Central Italy, using probability plots and pre selection methods. The derived values may differ by even two orders of magnitude for strongly skewed distributions. Results show that both methods have a degree of subjectivity, however the integration of the two methods reinforces the validity of the assessment. Critical issues include statistical data distribution choice, minimum population size, distance of the sampling sites from anthropized areas. Pre selection methods appear more robust than probability plots when the hydrogeological asset is duly considered. The greater importance of the aquifer conceptual model of the system, than the choice of a statistical method, is pointed out. C 2014 Elsevier B.V. All rights reserved. 143 Articolo in rivista Elsevier 0375 6742 Journal of geochemical exploration Journal of geochemical exploration J. geochem. explor. DEL BON ANDREA danieleparrone PARRONE DANIELE stefano.ghergo GHERGO STEFANO elisabetta.preziosi PREZIOSI ELISABETTA |