Environmental Science and Pollution Research

, Volume 22, Issue 21, pp 16830–16842 | Cite as

A reactive transport model for mercury fate in contaminated soil—sensitivity analysis

Research Article

Abstract

We present a sensitivity analysis of a reactive transport model of mercury (Hg) fate in contaminated soil systems. The one-dimensional model, presented in Leterme et al. (2014), couples water flow in variably saturated conditions with Hg physico-chemical reactions. The sensitivity of Hg leaching and volatilisation to parameter uncertainty is examined using the elementary effect method. A test case is built using a hypothetical 1-m depth sandy soil and a 50-year time series of daily precipitation and evapotranspiration. Hg anthropogenic contamination is simulated in the topsoil by separately considering three different sources: cinnabar, non-aqueous phase liquid and aqueous mercuric chloride. The model sensitivity to a set of 13 input parameters is assessed, using three different model outputs (volatilized Hg, leached Hg, Hg still present in the contaminated soil horizon). Results show that dissolved organic matter (DOM) concentration in soil solution and the binding constant to DOM thiol groups are critical parameters, as well as parameters related to Hg sorption to humic and fulvic acids in solid organic matter. Initial Hg concentration is also identified as a sensitive parameter. The sensitivity analysis also brings out non-monotonic model behaviour for certain parameters.

Keywords

Mercury Hg Sensitivity analysis Morris Vadose zone Reactive transport modelling HP1 

Supplementary material

11356_2015_4876_MOESM1_ESM.docx (27 kb)
ONLINE RESOURCE 1Tables of elementary effect statistics μ (arithmetic mean), μ* (mean of the absolute values) and σ (standard deviation) for the sensitivity analysis. The three Tables correspond to the three simulation groups: (a) cinnabar, (b) Hg NAPL and (c) HgCl2(aq) as the initial contamination. (DOCX 27 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  1. 1.Performance Assessments, Institute for Environment, Health and SafetyBelgian Nuclear Research Centre (SCK•CEN)MolBelgium

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