Abstract
Identifying and quantifying the processes governing the mobilization of metals during resuspension events is key to assessing long-term metals efflux from sediments and associated ecological impacts. We investigated the effects of sediment resuspension on the mobilization and chemical speciation of zinc in two-week-long batch experiments using metal-contaminated sediments from Lake DePue (IL, USA). Measurements of dissolved zinc and sulfate allowed us to characterize the kinetics of metal sulfide dissolution and the resulting net release of zinc to the aqueous phase. X-ray absorption spectroscopy (XAS) provided direct insights into the chemical speciation of iron and zinc and their dynamic transformations during resuspension. While ZnS rapidly oxidized during resuspension, dissolved zinc increased only after two days of resuspension. We proposed a kinetic model to explain changes in the chemical speciation of zinc during these experiments as constrained by the dissolved species concentrations and chemical speciation as informed by XAS. Only 15% of the zinc mobilized was released to the aqueous phase while the remaining fraction repartitioned the solid phase either as a carbonate precipitate or as a sorbed species. Our results show that zinc sorption onto particle surfaces and reprecipitation of zinc minerals limit zinc solubility during resuspension of metal-sulfide sediments.
| Language | English (US) |
|---|---|
| Pages | 300-308 |
| Number of pages | 9 |
| Journal | Journal of Hazardous Materials |
| Volume | 364 |
| DOIs | |
| State | Published - Feb 15 2019 |
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Keywords
- Contaminated sediment
- Oxidative dissolution
- Resuspension
- Scavenge
- Zinc mobility
ASJC Scopus subject areas
- Environmental Engineering
- Environmental Chemistry
- Waste Management and Disposal
- Pollution
- Health, Toxicology and Mutagenesis
Cite this
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Effects of resuspension on the mobility and chemical speciation of zinc in contaminated sediments. / Xie, Minwei; Alsina, Marco A.; Yuen, Jeffrey; Packman, Aaron; Gaillard, Jean-Francois.
In: Journal of Hazardous Materials, Vol. 364, 15.02.2019, p. 300-308.Research output: Contribution to journal › Article
TY - JOUR
T1 - Effects of resuspension on the mobility and chemical speciation of zinc in contaminated sediments
AU - Xie, Minwei
AU - Alsina, Marco A.
AU - Yuen, Jeffrey
AU - Packman, Aaron
AU - Gaillard, Jean-Francois
PY - 2019/2/15
Y1 - 2019/2/15
N2 - Identifying and quantifying the processes governing the mobilization of metals during resuspension events is key to assessing long-term metals efflux from sediments and associated ecological impacts. We investigated the effects of sediment resuspension on the mobilization and chemical speciation of zinc in two-week-long batch experiments using metal-contaminated sediments from Lake DePue (IL, USA). Measurements of dissolved zinc and sulfate allowed us to characterize the kinetics of metal sulfide dissolution and the resulting net release of zinc to the aqueous phase. X-ray absorption spectroscopy (XAS) provided direct insights into the chemical speciation of iron and zinc and their dynamic transformations during resuspension. While ZnS rapidly oxidized during resuspension, dissolved zinc increased only after two days of resuspension. We proposed a kinetic model to explain changes in the chemical speciation of zinc during these experiments as constrained by the dissolved species concentrations and chemical speciation as informed by XAS. Only 15% of the zinc mobilized was released to the aqueous phase while the remaining fraction repartitioned the solid phase either as a carbonate precipitate or as a sorbed species. Our results show that zinc sorption onto particle surfaces and reprecipitation of zinc minerals limit zinc solubility during resuspension of metal-sulfide sediments.
AB - Identifying and quantifying the processes governing the mobilization of metals during resuspension events is key to assessing long-term metals efflux from sediments and associated ecological impacts. We investigated the effects of sediment resuspension on the mobilization and chemical speciation of zinc in two-week-long batch experiments using metal-contaminated sediments from Lake DePue (IL, USA). Measurements of dissolved zinc and sulfate allowed us to characterize the kinetics of metal sulfide dissolution and the resulting net release of zinc to the aqueous phase. X-ray absorption spectroscopy (XAS) provided direct insights into the chemical speciation of iron and zinc and their dynamic transformations during resuspension. While ZnS rapidly oxidized during resuspension, dissolved zinc increased only after two days of resuspension. We proposed a kinetic model to explain changes in the chemical speciation of zinc during these experiments as constrained by the dissolved species concentrations and chemical speciation as informed by XAS. Only 15% of the zinc mobilized was released to the aqueous phase while the remaining fraction repartitioned the solid phase either as a carbonate precipitate or as a sorbed species. Our results show that zinc sorption onto particle surfaces and reprecipitation of zinc minerals limit zinc solubility during resuspension of metal-sulfide sediments.
KW - Contaminated sediment
KW - Oxidative dissolution
KW - Resuspension
KW - Scavenge
KW - Zinc mobility
UR - http://www.scopus.com/inward/record.url?scp=85055324922&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85055324922&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2018.10.043
DO - 10.1016/j.jhazmat.2018.10.043
M3 - Article
VL - 364
SP - 300
EP - 308
JO - Journal of Hazardous Materials
T2 - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
SN - 0304-3894
ER -