Dissolved fulvic acids from a high arsenic aquifer shuttle electrons to enhance microbial iron reduction

Kulkarni, Harshad V.1; Mladenov, Natalie2; McKnight, Diane M.3; Zheng, Yan4,5,6; Kirk, Matthew F.7; Nemergut, Diana R.3,8

2018-02-15

10.1016/j.scitotenv.2017.09.164

SCIENCE OF THE TOTAL ENVIRONMENT   影响因子和分区

0048-9697

1879-1026

It was demonstrated more than two decades ago that microorganisms use humic substances, including fulvic acid (FA), as electron shuttles during iron (Fe) reduction in anaerobic soils and sediments. The relevance of this mechanism for the acceleration of Fe(III) reduction in arsenic-laden groundwater environments is gaining wider attention. Here we provide new evidence that dissolved FAs isolated from sediment-influenced surface water and groundwater in the Bengal Basin were capable of electron shuttling between Geobacter metallireducens and Fe(III). Moreover, all four Bangladesh sediment-derived dissolved FAs investigated in this study had higher electron accepting capacity (176 to 245 mu mol/g) compared to aquatic FAs, such as Suwanee River Fulvic Acid (67 mu mol/g). Our direct evidence that Bangladesh FAs are capable of intermediate electron transfer to Fe(III) supports other studies that implicate electron shuttling by sediment-derived aqueous humics to enhance Fe reduction and, in turn, As mobility. Overall, the finding of greater electron accepting capacity by dissolved FAs from groundwater and other sediment-influenced environments advances our understanding of mechanisms that control Fe reduction under conditions where electron transfer is the rate limiting step. (C) 2017 Elsevier B.V. All rights reserved.

Iron Arsenic Organic matter Bacteria Fulvic acid Groundwater

SCI ; EI

英语

其他

US National Science Foundation[1449247] ; US National Science Foundation[0738888]

Environmental Sciences & Ecology

Environmental Sciences

WOS:000414922600142

ELSEVIER SCIENCE BV

20174304294038

Aquifers ; Arsenic ; Bacteria ; Biological materials ; Dissolution ; Electron transitions ; Groundwater ; Groundwater resources ; Iron ; Organic acids ; Sediments ; Surface waters

Surface Water:444.1 ; Groundwater:444.2 ; Biological Materials and Tissue Engineering:461.2 ; Soil Mechanics and Foundations:483 ; Iron:545.1 ; Chemical Operations:802.3 ; Chemical Products Generally:804 ; Organic Compounds:804.1

ENVIRONMENT/ECOLOGY

Web of Science

1.Kansas State Univ, Dept Civil Engn, 2118 Fiedler Hall, Manhattan, KS 66506 USA
2.San Diego State Univ, Dept Civil Construct & Environm Engn, San Diego, CA 92182 USA
3.Univ Colorado, INSTAAR, Boulder, CO 80302 USA
4.Southern Univ Sci & Technol, Sch Environm Sci & Engn, Shenzhen 518005, Peoples R China
5.Southern Univ Sci & Technol, Shenzhen Key Lab Soil & Groundwater Pollut Contro, Shenzhen 518005, Peoples R China
6.Columbia Univ, Lamont Doherty Earth Observ, Palisades, NY 10964 USA
7.Kansas State Univ, Dept Geol, Manhattan, KS 66502 USA
8.Duke Univ, Dept Biol, Durham, NC 27708 USA

Kulkarni, Harshad V.,Mladenov, Natalie,McKnight, Diane M.,et al. Dissolved fulvic acids from a high arsenic aquifer shuttle electrons to enhance microbial iron reduction[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2018,615:1390-1395.

Kulkarni, Harshad V.,Mladenov, Natalie,McKnight, Diane M.,Zheng, Yan,Kirk, Matthew F.,&Nemergut, Diana R..(2018).Dissolved fulvic acids from a high arsenic aquifer shuttle electrons to enhance microbial iron reduction.SCIENCE OF THE TOTAL ENVIRONMENT,615,1390-1395.

Kulkarni, Harshad V.,et al."Dissolved fulvic acids from a high arsenic aquifer shuttle electrons to enhance microbial iron reduction".SCIENCE OF THE TOTAL ENVIRONMENT 615(2018):1390-1395.