Abstract

Geologic carbon sequestration represents a promising option for carbon mitigation. Injected CO 2, however, can potentially leak into water systems, increase water acidity, and mobilize metals. This study used column experiments to quantify the effects of environmental controls on cadmium desorption during CO 2 leakage in subsurface systems without ambient flow. Results show that fast leakage rates are responsible for earlier and larger amounts of Cd desorption. Long weathering time of Cd laden clay leads to low Cd desorption. Calcite content as low as 10% can mitigate the effect of pH reduction and result in zero Cd desorption. Increasing the salinity of the leaking fluid has a relatively minor effect, primarily due to the offsetting impacts of an increased extent of ion exchange and the decrease in CO 2 solubility (and therefore acidity). This work systematically quantifies, for the first time, the effects of environmental controls on Cd desorption and points to key parameters for risk assessment associated with metal mobilization during CO 2 leakage.

Original languageEnglish (US)
Pages (from-to)4388-4395
Number of pages8
JournalEnvironmental Science and Technology
Volume46
Issue number8
DOIs
StatePublished - Apr 17 2012

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Carbon Monoxide
Cadmium
leakage
Desorption
desorption
cadmium
Acidity
acidity
Carbon
Metals
Water
Calcium Carbonate
metal
Weathering
Risk assessment
carbon sequestration
mobilization
ion exchange
Ion exchange
solubility

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry

Cite this

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title = "Environmental controls of cadmium desorption during CO 2 leakage",
abstract = "Geologic carbon sequestration represents a promising option for carbon mitigation. Injected CO 2, however, can potentially leak into water systems, increase water acidity, and mobilize metals. This study used column experiments to quantify the effects of environmental controls on cadmium desorption during CO 2 leakage in subsurface systems without ambient flow. Results show that fast leakage rates are responsible for earlier and larger amounts of Cd desorption. Long weathering time of Cd laden clay leads to low Cd desorption. Calcite content as low as 10{\%} can mitigate the effect of pH reduction and result in zero Cd desorption. Increasing the salinity of the leaking fluid has a relatively minor effect, primarily due to the offsetting impacts of an increased extent of ion exchange and the decrease in CO 2 solubility (and therefore acidity). This work systematically quantifies, for the first time, the effects of environmental controls on Cd desorption and points to key parameters for risk assessment associated with metal mobilization during CO 2 leakage.",
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Environmental controls of cadmium desorption during CO 2 leakage. / Frye, Evan; Bao, Chen; Li, Li; Blumsack, Seth.

In: Environmental Science and Technology, Vol. 46, No. 8, 17.04.2012, p. 4388-4395.

Research output: Contribution to journalArticle

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AU - Bao, Chen

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