지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
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초록· 키워드
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To test the potential effects of extracellular electron shuttles (EES) on the rate and extent of heavy metal release from contaminated soils during microbial iron reduction, we created anaerobic batch systems with anthraquinone-2,6-disulfonate (AQDS) as a surrogate of EES, and with contaminated soils as mixed iron (hydr)oxides and microbial sources. Two types of soils were tested: Zn-contaminated soil A and As/Pb-contaminated soil B. In soil A, the rate of iron reduction was fastest in the presence of AQDS and > 3500 mg/L of total Fe(II) was produced within 2 d. This suggests that indigenous microorganisms can utilize AQDS as EES to stimulate iron reduction. In the incubations with soil B, the rate and extent of iron reduction did not increase in the presence of AQDS likely because of the low pH (< 5.5). In addition, less than 2000 mg/L of total Fe(II) was produced in soil B within 52 d suggesting that iron reduction by subsurface microorganisms in soil B was not as effective as that in soil A. Relatively high amount of As (~500 mg/L) was released to the aqueous phase during microbial iron reduction in soil B. The release of As might be due to the reduction of As-associated iron (hydr)oxides and/or direct enzymatic reduction of As(V) to As(III) by As-reducing microorganisms. However, given that Pb in liquid phase was < 0.3 mg/L for the entire experiment, the microbial reduction As(V) to As(III) by As-reducing microorganisms has most likely occurred in this system. This study suggests that heavy metal release from contaminated soils can be strongly controlled by subsurface microorganisms, soil pH, presence of EES, and/or nature of heavy metals.
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참고문헌 (30)
참고문헌 신청
Ayyasamy, P.M / 2009 / Desorption and dissolution of heavy metals from contaminated soil using Shewanella sp. (HN-41) amended with various carbon sources and synthetic soil organic matters / J. Hazard. Mater 161:1095~1102
Bae, S / 2013 / Biotransformation of lepidocrocite in the presence of quinones and flavins / Geochim. Cosmochim. Acta 114:144~155
Bertolacini, R / 1957 / Colorimetric determination of sulfate with barium chloranilate / Anal. Chem 29:281~283
Caccavo, F / 1992 / A hydrogen-oxidizing, Fe (III)-reducing microorganism from the Great Bay Estuary, New Hampshire / Appl. Environ. Microbiol 58:3211~3216
Cervantes, F.J / 2000 / Competition between methanogenesis and quinone respiration for ecologically important substrates in anaerobic consortia / FEMS Microbiol. Ecol 34:161~171
Bae, S / 2013 / Biotransformation of lepidocrocite in the presence of quinones and flavins / Geochim. Cosmochim. Acta 114:144~155
Bertolacini, R / 1957 / Colorimetric determination of sulfate with barium chloranilate / Anal. Chem 29:281~283
Caccavo, F / 1992 / A hydrogen-oxidizing, Fe (III)-reducing microorganism from the Great Bay Estuary, New Hampshire / Appl. Environ. Microbiol 58:3211~3216
Cervantes, F.J / 2000 / Competition between methanogenesis and quinone respiration for ecologically important substrates in anaerobic consortia / FEMS Microbiol. Ecol 34:161~171
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