Redox transformation and reductive immobilization of Cr(VI) in the Columbia River hyporheic zone sediments

Xu, Fen1,2; Liu, Yuanyuan2,3; Zachara, John2; Bowden, Mark2; Kennedy, David2; Plymale, Andrew E.2; Liu, Chongxuan2,4

2017-12

10.1016/j.jhydrol.2017.10.016

JOURNAL OF HYDROLOGY   影响因子和分区

0022-1694

1879-2707

An experimental and modeling study was conducted to investigate the redox transformation and reductive immobilization of groundwater contaminant Cr in hyporheic zone (HZ) sediments from U.S. DOE's Hanford Site, where groundwater Cr(VI) is migrating and discharging to the nearby Columbia River. Experimental results revealed that Cr(VI) can be reduced and immobilized by the HZ sediments in the presence/absence of O-2. Anaerobic pre-incubation of the sediments increased the effective rate of Cr reduction that was correlated with the increase in HCl-extractable Fe(II) content in the sediments. The reduced Cr was stable when exposed to O-2 under field-relevant pH (7.5) with and without dissolved Mn(II), which might be oxidized to form Mn(III/IV) oxides that may oxidize reduced Cr. The Cr(VI) reduction rate showed a multi-rate behavior, apparently reflecting the presence of reductants with different reactivity in the sediments. The results from this study indicated that the HZ sediments can reductively immobilize Cr and the sediment redox capacity can be recharged through microbial activities. The results implied that HZ can play a role as a natural permeable redox barrier for removing groundwater Cr before it discharges into a river system. (C) 2017 Elsevier B.V. All rights reserved.

Hyporheic zone Toxic metals Cr(VI) retardation Redox barrier Biogeochemical reaction model

SCI ; EI

英语

通讯

Southern University of Science and Technology[G01296001]

Engineering ; Geology ; Water Resources

Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources

WOS:000418107600022

ELSEVIER SCIENCE BV

20174304300314

Chlorine compounds ; Groundwater ; Groundwater pollution ; Iron compounds ; Manganese compounds ; Rivers ; Sediments ; Stream flow

Waterways:407.2 ; Groundwater:444.2 ; Soil Mechanics and Foundations:483

ENGINEERING

Web of Science

1.China Univ Geosci, Sch Environm Studies, Wuhan 430074, Hubei, Peoples R China
2.Pacific Northwest Natl Lab, Richland, WA 99354 USA
3.Nanjing Univ, Sch Earth Sci & Engn, Nanjing 210023, Jiangsu, Peoples R China
4.Southern Univ Sci & Technol, Sch Environm Sci & Engn, Guangzhou 518055, Guangdong, Peoples R China

Xu, Fen,Liu, Yuanyuan,Zachara, John,et al. Redox transformation and reductive immobilization of Cr(VI) in the Columbia River hyporheic zone sediments[J]. JOURNAL OF HYDROLOGY,2017,555:278-287.

Xu, Fen.,Liu, Yuanyuan.,Zachara, John.,Bowden, Mark.,Kennedy, David.,...&Liu, Chongxuan.(2017).Redox transformation and reductive immobilization of Cr(VI) in the Columbia River hyporheic zone sediments.JOURNAL OF HYDROLOGY,555,278-287.

Xu, Fen,et al."Redox transformation and reductive immobilization of Cr(VI) in the Columbia River hyporheic zone sediments".JOURNAL OF HYDROLOGY 555(2017):278-287.