Contrasting kinetics of arsenic release from As-bearing ferrihydrite coprecipitates by distinct sulfate-reducing bacteria
Microbial sulfate reduction plays key roles in arsenic (As) biotransformation and release in groundwater aquifers; however, influences by distinct sulfate-reducing strains on the transformation of As-bearing iron (oxyhydr)oxide under different sulfate availability and associated As mobilization are...
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Elsevier
2025-03-01
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| Series: | Ecotoxicology and Environmental Safety |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0147651325003719 |
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| author | Ran Luo Yu Cheng Tenglong Song Zhengyu Wu Yanhong Wang Ping Li |
| author_facet | Ran Luo Yu Cheng Tenglong Song Zhengyu Wu Yanhong Wang Ping Li |
| author_sort | Ran Luo |
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| description | Microbial sulfate reduction plays key roles in arsenic (As) biotransformation and release in groundwater aquifers; however, influences by distinct sulfate-reducing strains on the transformation of As-bearing iron (oxyhydr)oxide under different sulfate availability and associated As mobilization are not clear. In this study, anaerobic batch experiments were conducted to clarify the transformation processes of As-bearing ferrihydrite mediated by two distinct sulfate-reducing strains. Results showed that both the purchased model strain Desulfovibrio vulgaris (D-1) and the Citrobacter sp. C-1 isolated from high As groundwater in this study were capable of sulfate, iron and arsenate reduction. However, they presented different patterns of sulfate/iron reduction and As release under As-bearing ferrihydrite conditions attributed to their preferential functions. Sulfate input accelerated the bioreduction of sulfate and ferrihydrite simultaneously by D-1, thereby facilitated arsenic release and formation of vivianite, mackinawite and goethite. The As release was accelerated by 20.7 % and 165.5 % under 1 mM and 10 mM sulfate amendment, respectively. In contrast, sulfate reduction occurred in the early stage (0–7 days) and iron reduction began afterwards in strain C-1 treatment, thus the increased sulfate hindered initial ferrihydrite reduction and suppress As release by 27.9 % and 37.9 % in 1 and 10 mM sulfate systems, respectively. The final secondary minerals were predominantly presented as amorphous goethite by C-1 due to low ferrihydrite reduction. The results highlight the necessary consideration of preferred functions of SRB when exploring the sulfate-mediated As release processes. |
| format | Article |
| id | doaj-art-01eca99930f74ad3b80dc530dc84dff2 |
| institution | OA Journals |
| issn | 0147-6513 |
| language | English |
| publishDate | 2025-03-01 |
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| series | Ecotoxicology and Environmental Safety |
| spelling | doaj-art-01eca99930f74ad3b80dc530dc84dff22025-08-20T01:49:28ZengElsevierEcotoxicology and Environmental Safety0147-65132025-03-0129311803510.1016/j.ecoenv.2025.118035Contrasting kinetics of arsenic release from As-bearing ferrihydrite coprecipitates by distinct sulfate-reducing bacteriaRan Luo0Yu Cheng1Tenglong Song2Zhengyu Wu3Yanhong Wang4Ping Li5State Key Laboratory of Geomicrobiology and Environmental Changes, China University of Geosciences, Wuhan 430074, PR ChinaState Key Laboratory of Geomicrobiology and Environmental Changes, China University of Geosciences, Wuhan 430074, PR ChinaSchool of Environmental Studies, China University of Geosciences, Wuhan 430074, PR ChinaState Key Laboratory of Geomicrobiology and Environmental Changes, China University of Geosciences, Wuhan 430074, PR ChinaState Key Laboratory of Geomicrobiology and Environmental Changes, China University of Geosciences, Wuhan 430074, PR China; Hubei Key Laboratory of Yangtze Catchment Environmental Aquatic Science, China University of Geosciences, Wuhan 430074, PR China; Corresponding author at: State Key Laboratory of Geomicrobiology and Environmental Changes, China University of Geosciences, Wuhan 430074, PR China.State Key Laboratory of Geomicrobiology and Environmental Changes, China University of Geosciences, Wuhan 430074, PR China; Hubei Key Laboratory of Yangtze Catchment Environmental Aquatic Science, China University of Geosciences, Wuhan 430074, PR ChinaMicrobial sulfate reduction plays key roles in arsenic (As) biotransformation and release in groundwater aquifers; however, influences by distinct sulfate-reducing strains on the transformation of As-bearing iron (oxyhydr)oxide under different sulfate availability and associated As mobilization are not clear. In this study, anaerobic batch experiments were conducted to clarify the transformation processes of As-bearing ferrihydrite mediated by two distinct sulfate-reducing strains. Results showed that both the purchased model strain Desulfovibrio vulgaris (D-1) and the Citrobacter sp. C-1 isolated from high As groundwater in this study were capable of sulfate, iron and arsenate reduction. However, they presented different patterns of sulfate/iron reduction and As release under As-bearing ferrihydrite conditions attributed to their preferential functions. Sulfate input accelerated the bioreduction of sulfate and ferrihydrite simultaneously by D-1, thereby facilitated arsenic release and formation of vivianite, mackinawite and goethite. The As release was accelerated by 20.7 % and 165.5 % under 1 mM and 10 mM sulfate amendment, respectively. In contrast, sulfate reduction occurred in the early stage (0–7 days) and iron reduction began afterwards in strain C-1 treatment, thus the increased sulfate hindered initial ferrihydrite reduction and suppress As release by 27.9 % and 37.9 % in 1 and 10 mM sulfate systems, respectively. The final secondary minerals were predominantly presented as amorphous goethite by C-1 due to low ferrihydrite reduction. The results highlight the necessary consideration of preferred functions of SRB when exploring the sulfate-mediated As release processes.http://www.sciencedirect.com/science/article/pii/S0147651325003719Arsenic releaseGroundwaterSulfate reductionMineral transformationFunctional strains |
| spellingShingle | Ran Luo Yu Cheng Tenglong Song Zhengyu Wu Yanhong Wang Ping Li Contrasting kinetics of arsenic release from As-bearing ferrihydrite coprecipitates by distinct sulfate-reducing bacteria Ecotoxicology and Environmental Safety Arsenic release Groundwater Sulfate reduction Mineral transformation Functional strains |
| title | Contrasting kinetics of arsenic release from As-bearing ferrihydrite coprecipitates by distinct sulfate-reducing bacteria |
| title_full | Contrasting kinetics of arsenic release from As-bearing ferrihydrite coprecipitates by distinct sulfate-reducing bacteria |
| title_fullStr | Contrasting kinetics of arsenic release from As-bearing ferrihydrite coprecipitates by distinct sulfate-reducing bacteria |
| title_full_unstemmed | Contrasting kinetics of arsenic release from As-bearing ferrihydrite coprecipitates by distinct sulfate-reducing bacteria |
| title_short | Contrasting kinetics of arsenic release from As-bearing ferrihydrite coprecipitates by distinct sulfate-reducing bacteria |
| title_sort | contrasting kinetics of arsenic release from as bearing ferrihydrite coprecipitates by distinct sulfate reducing bacteria |
| topic | Arsenic release Groundwater Sulfate reduction Mineral transformation Functional strains |
| url | http://www.sciencedirect.com/science/article/pii/S0147651325003719 |
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