TY - JOUR
T1 - Metal partitioning dynamics during the oxidation and acidification of sulfidic soil
AU - Claff, Salirian R.
AU - Burton, Edward D.
AU - Sullivan, Leigh A.
AU - Bush, Richard T.
PY - 2011
Y1 - 2011
N2 - The oxidation and acidification of sulfidic soil can lead to changes to metal mobility that can have far-reaching environmental consequences. In this study, we examined changes in the partitioning and mobility of Fe, Cr, Cu, Mn, Ni and Zn in four sulfidic soils, due to sulphide oxidation driven acidification, over a 90. day period. These changes were examined using a novel six-step sequential extraction procedure specifically developed for acid sulphate soil materials. The results demonstrate two distinct steps for the mobilisation of metals in disturbed acid sulphate soil materials, associated with (i) oxidation and (ii) acidification. Initially, oxidation causes metals to be redistributed from the "pyritic" and "organic" fractions to the "acid-soluble" fraction. Subsequent acidification, due to exceedance of the acid neutralising capacity of the soil, drives the release of metals to the "labile" fraction. This study demonstrates the importance of these metal pools in understanding the short-term processes which mobilise metals in sulfidic soils.
AB - The oxidation and acidification of sulfidic soil can lead to changes to metal mobility that can have far-reaching environmental consequences. In this study, we examined changes in the partitioning and mobility of Fe, Cr, Cu, Mn, Ni and Zn in four sulfidic soils, due to sulphide oxidation driven acidification, over a 90. day period. These changes were examined using a novel six-step sequential extraction procedure specifically developed for acid sulphate soil materials. The results demonstrate two distinct steps for the mobilisation of metals in disturbed acid sulphate soil materials, associated with (i) oxidation and (ii) acidification. Initially, oxidation causes metals to be redistributed from the "pyritic" and "organic" fractions to the "acid-soluble" fraction. Subsequent acidification, due to exceedance of the acid neutralising capacity of the soil, drives the release of metals to the "labile" fraction. This study demonstrates the importance of these metal pools in understanding the short-term processes which mobilise metals in sulfidic soils.
KW - Acid sulphate soil
KW - Acidification
KW - Metal partitioning
KW - Oxidation
UR - http://www.scopus.com/inward/record.url?scp=79959787585&partnerID=8YFLogxK
U2 - 10.1016/j.chemgeo.2011.04.020
DO - 10.1016/j.chemgeo.2011.04.020
M3 - Article
AN - SCOPUS:79959787585
VL - 286
SP - 146
EP - 157
JO - Chemical Geology (Isotopic Geoscience) Section
JF - Chemical Geology (Isotopic Geoscience) Section
SN - 0009-2541
IS - 3-4
ER -