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제114회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Geochemical Characteristics and Microbial Community Composition in Toxic Metal-rich Sediments Contaminated by Au-Ag Mine Tailings [우수포스터상]

등록일
2014년 8월 28일 16시 14분 43초
접수번호
1208
발표코드
ENVR.P-1280 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
10월 15일 (수요일) 16:00~19:00
발표형식
포스터
발표분야
환경에너지
저자 및
공동저자
함박눈, 이기현1, 권만재*
한국과학기술연구원(KIST) 천연물융합연구센터, Korea
1연세대학교 지구시스템과학과, Korea
The effects of extreme geochemical conditions on microbial community composition were investigated using two distinct sets of sediment samples collected near weathered mine tailings. One set (SCH) showed extraordinary geochemical characteristics: As (6.7-11.5%), Pb (1.5-2.1%), Zn (0.1-0.2%), and pH (3.1-3.5). The other set (SCL) had As (0.3-1.2%), Pb (0.02-0.22%), and Zn (0.01-0.02%) at pH of 2.5-3.1. The bacterial communities in SCL were clearly different from those in SCH suggesting extreme geochemical conditions affected microbial community distribution even on a small spatial scale. The clones identified in SCL were closely related to acidophilic bacteria within the taxa Acidobacterium (18%), Acidomicrobineae (14%), and Leptospirillum (10%). Most clones in SCH were closely related to Methylobacterium (79%) and Ralstonia (19%), both of which are well-known metal-resistant bacteria. Although total As was extremely high, over 95% of it was in the form of scorodite (FeAsO4?2H2O). Acid extractable As was only ~118 and ~14 ppm in SCH and SCL, respectively, which is not known to be toxic to bacteria. Meanwhile, acid extractable Pb and Zn in SCH were above concentrations toxic to bacteria. Because As was present in an oxidized and stable form it is likely that Pb and/or Zn released from the sediment were mainly responsible for the differences in microbial community structure.

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