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Pedogenic Background Concentration (PBC) of Potentially Toxic Elements (PTE) in an industrial area: a proposal for a new pedological-oriented approach in the evaluation of Ambient Background Concentration (ABC)

Capra, Gian Franco and Vacca, Sergio and Cabula, Emanuela and Grilli, Eleonora and Buondonno, Andrea (2011) Pedogenic Background Concentration (PBC) of Potentially Toxic Elements (PTE) in an industrial area: a proposal for a new pedological-oriented approach in the evaluation of Ambient Background Concentration (ABC). In: 6. International congress of European Society for Soil Conservation: innovative strategies and policies for soil conservation, 9-14 May 2011, Thessaloniki, Greece. Thessaloniki, National Agricultural Research Foundation. p. 30. ISBN 978-960-88296-9-5. Conference or Workshop Item.

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Abstract

According to the International Organisation for Standardisation (ISO), the Ambient Background Concentration (ABC) or “usual background concentration” generally consists of both a natural pedo-geochemical fraction and a moderate diffuse anthropogenic fraction. There is as yet no agreed method by which to estimate a local or soil-type specific ABC, but three main methods are usually accepted worldwide. The first method, generally used to assess changes on a local and regional scale, is based on the evaluation of mean and range values of Potentially Toxic Element (PTE) concentrations in surface horizons of soil taxonomical units calculated from existing databases. Another method, referred to as the “enrichment factos approach”, involves taking metal concentrations measured in the deeper soil horizon (C horizons) as the local background for surface horizons. The third approach uses the relationships between trace elements and demi-conservative elements such as Fe, Al and Mn to predict forecast values of trace elements in top soils. All these methods are mainly based on a geochemical approach aiming to assess the values observed in the surface horizons (mainly A horizons), while less attention, or indeed an entire lack of data, has been gerenally observed on sub-surface and deep pedogenic horizons.
This research presents a new pedological-oriented approach for the estimation of ABC, called the Pedogenic Background Concentration (PBC). The PBC represent the pedogenic value of the investigated elements in the soil. Not only must the values of surface horizons be involved in this approach, but there must also be an accurate pedological investigation, with the recognition of all pedogenic horizons into the investigated soil profile.
As a case study, eleven profiles located in the industrial area of Ottana-Bolotana (Sardinia-Italy) and developed under the same soil use, vegetal cover, climate, morphologic and geological conditions were investigated with a view to estimating local/soiltype specific PBC.
PBC values were assessed through statistical analysis (principal component analysis box-plot analysis and simple or multiple linear regression analysis) aiming to evaluate the relationships between soil physical-chemical parameters (sand, silt, clay, pH, conductivity, carbonates, N, P, CSC, Al, Fe and Mn) and PTEs (Sb, As, Cd, Co, Cr, Ni, Pb, Cu and Zn).
The study shows that in non-polluted soils, the PBC well explains the values of the different investigated PTEs along the pedogenic soil horizons. More specifically, the interquartile distance can be used as a PBC range for the investigated Co, Cr, Ni, Pb, Cu and Zn.

Item Type:Conference or Workshop Item (Poster)
ID Code:9600
Status:Published
Uncontrolled Keywords:Ambient Background Concentration (ABC), Pedogenic Background Concentration (PBC), Potentially Toxic Elements (PTE)
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/14 Pedologia
Divisions:001 Università di Sassari > 01 Dipartimenti > Scienze botaniche, ecologiche e geologiche
Publisher:National Agricultural Research Foundation
ISBN:978-960-88296-9-5
Deposited On:04 Feb 2014 10:45

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