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Geochemical indices and regression tree models for estimation of ambient background concentrations of copper, chromium, nickel and zinc in soil.

Abstract：

:Geochemical ratios between elements of environmental concern and Fe have been recommended for estimation of "background" concentrations of Cr, Cu, Ni and Zn in soil. However, little research has occurred to assess the consistency of geochemical ratios across soils developed in different environments. Broad application of generic geochemical ratios could result in under or over estimation of anthropogenic impacts to soil and subsequent inaccurate assessment of risk to the environment. A soil survey was undertaken in Victoria, Australia, including collection of samples (n = 622) from surface (0-0.1 m below ground level) and sub-surface (0.3-0.6 m below ground level) soils, overlying Tertiary-Quaternary basalt, Tertiary sediments and Silurian siltstones and sandstones. Samples were analyzed for metals and soil physical and chemical properties (particle size, cation exchange capacity, organic matter and pH). Geochemical correlations between elements in soils from different parent materials and environments were compared against geochemical relationships reported in Australia and internationally. Ratios of Cr and Fe were relatively consistent across parent materials, and comparable to published models for estimation of background Cr. Conversely, ratios between Cu, Ni, and Zn with Fe, were variable between soils developed in different weathering environments and/or soil depths. Alternative regression equations and rule based regression tree models were developed as an improved means for prediction of ambient background Cu, Ni and Zn concentrations in soil. Ambient background concentrations of Ni and Cr were predictable across parent materials and depths, allowing these models to be extended to soils across Australia and potentially internationally.

journal_name

Chemosphere

journal_title

Chemosphere

authors

Mikkonen HG,van de Graaff R,Clarke BO,Dasika R,Wallis CJ,Reichman SM

doi

10.1016/j.chemosphere.2018.06.138

subject

Has Abstract

pub_date

2018-11-01 00:00:00

pages

193-203

eissn

0045-6535

issn

1879-1298

pii

S0045-6535(18)31213-X

journal_volume

210

pub_type

杂志文章

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