텅스텐의 지구화학적 거동에 미치는 미생물의 영향
Effects of Microorganisms on Geochemical Behavior of Tungsten
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64~113 mg/kg의 W를 함유하는 토양 및 퇴적물에서 외견상 집락이 구분되는 13종류의 토착 미생물을 분리한 후 이들이 혐기성 조건에서 용존 W(VI)의 거동에 미치는 영향을 실험적으로 조사하였다. 1,000 mg/L의 W(VI)를주입한 결과 8종류의 미생물이 무생물적 비교시료(94 mg/L)에 비하여 2배 이상의 W(192~378 mg/L)를 용액으로부터침전시켜 제거하였다. 이들 중 Klebsiella sp.와 Pantoea sp.로 동정된 두 종을 이용하여 추가 실험을 수행한 결과, 비교시료에 비하여 월등히 많은 양(210~309 mg/L)의 W(VI)를 W(IV)로 환원하였다. 이러한 미생물학적 W(VI) 환원은 발효에 의한 용액의 pH 감소가 주된 기제인 것으로 보이며 Klebsiella sp.의 경우 W의 해독성 환원기제도 일부 고려할수 있다. 이 결과는 W의 지구화학적 거동에 미치는 미생물의 영향에 관한 최초의 보고이며 지질 매체 내에서 W의 순환에 미생물이 영향을 미칠 수 있음을 나타낸다.
Abstract
The effects of 13 indigenous microorganisms with distinct colony forms isolated from soils and sediments containing W of 64~113 mg/kg on the behavior of dissolved W(VI) were experimentally investigated under anaerobic condition. Compared with abiotic control (94 mg/L), eight bacteria decreased more than twice the amount of dissolved W (192~378 mg/L) forming precipitates in response to 1,000 mg/L W(VI) supply. The consecutive experiments using Klebsiella sp. and Pantoea sp. among the isolated microorganisms also showed that they reduced greater amounts (210~309 mg/L) of W(VI) to W(IV) than abiotic control. Such microbial reduction of W(VI) might be due to pH decrease by fermentation. In addition, for Klebsiella sp., detoxification was likely one of the mechanisms of W(VI) reduction. The results, which are the first evidence to our knowledge of the effects of microorganisms on geochemical behavior of W, indicate that microorganisms may influence the cycle of W in geological media.
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