Cr
Isotopes and the Engineered Attenuation of Cr(VI)-Rich
Runoff
Posted on 2021-10-20 - 19:13
The leaching of lateritic soils can
result in drainage waters with
high concentrations of Cr(VI). Such Cr(VI)-rich waters have developed
in streams that drain lateritic soils in Central Sulawesi Island,
Indonesia. Chromium in this lateritic drainage system is removed by
reduction of Cr(VI) to Cr(III) through two faucets delivering an FeSO4 solution to the drainage waters. Cr stable isotope compositions
from both water and sediment samples along the drainage path were
used to evaluate the efficacy of this remediation strategy. Overall,
dissolved [Cr(VI)] decreased moving downstream, but there was an increase
in [Cr(VI)] after the first faucet that was effectively removed at
the second faucet. This intermittent increase in [Cr(VI)] was the
likely result of oxidative remobilization of sediment Cr(III) through
reaction with Mn oxides. Cr isotope distributions reflect near quantitative
reduction associated with the FeSO4 faucets but also reveal
that Cr isotope fractionation is imparted due to Cr redox cycling,
downstream. During this redox cycling, fractionation appeared to accompany
oxidation, with the product Cr(VI) becoming enriched in 53Cr relative to the reactant Cr(III) with an apparent fractionation
factor of 0.7 ± 0.3‰. This study suggests that while FeSO4 effectively removes Cr(VI) from the drainage, the presence
of Mn oxides can confound attenuation and improvements to Cr(VI) remediation
should consider means of preventing the back reaction of Cr(III) with
Mn oxides.
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Davidson, Ashley
B.; Holmden, Chris; Nomosatryo, Sulung; Henny, Cynthia; Francois, Roger; Crowe, Sean A. (1753). Cr
Isotopes and the Engineered Attenuation of Cr(VI)-Rich
Runoff. ACS Publications. Collection. https://doi.org/10.1021/acs.est.1c01714
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AUTHORS (6)
AD
Ashley
B. Davidson
CH
Chris Holmden
SN
Sulung Nomosatryo
CH
Cynthia Henny
RF
Roger Francois
SC
Sean A. Crowe
KEYWORDS
sediment samples alongcentral sulawesi islandapparent fractionation factorcr ( vicr ( iiidrain lateritic soilscr isotope fractionationtwo faucets delivering7 ± 053 sup4 sublateritic drainage systemcr redox cyclinglateritic soilsredox cyclingfractionation appearedcr relativecr isotopesstudy suggestssecond faucetoxidative remobilizationmn oxidesimparted duehigh concentrationsfirst faucetengineered attenuationdrainage watersdrainage pathconsider meansconfound attenuationbecoming enrichedalso revealaccompany oxidation3 ‰.