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NTIS 바로가기바다 : 한국해양학회지 = The sea : the journal of the Korean society of oceanography, v.25 no.3, 2020년, pp.67 - 80
김태진 (부경대학교 해양학과)
Zinc (Zn) is known as an essential micronutrient for phytoplankton in the ocean. In surface waters, most of total dissolved Zn presents as organic complexes, and organic complexation dominates the speciation of Zn in seawater. Organic complexation reduces the bioavailable fraction of Zn, the free me...
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핵심어 | 질문 | 논문에서 추출한 답변 |
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해수 중에 존재하는 용존 금속 원소가 미량원소 또는 미량금속으로 불리우는 이유는 무엇인가? | 해수 중에 존재하는 용존 금속 원소는 일반적으로 pM – nM (10-12 – 10-9 mol/L)의 농도로 존재하며, 이런 낮은 농도로 인하여 미량원소(Trace element) 또는 미량금속(Trace metal)으로 불리운다. 그 중 철(Fe), 구리(Cu), 니켈(Ni), 코발트(Co), 카드뮴(Cd), 아연(Zn) 등은 해양 환경에서 식물플랑크톤의 성장에 필수적인 미량영양염(micronutrient)으로서 궁극적으로는 해양의 탄소순환과 전지구적 기후변화에 영향을 미친다고 알려져 있다(Anderson, 2020). | |
용존 미량금속 원소 중, 용존 아연이 해양 환경에서 영양염형(Nutrient type)의 연직분포를 나타내는 이유는 무엇인가? | 1). 이는 표층에서 생물에 의해 용존 아연이 소비되고 유기 입자로 심층으로 이동하여 재광물화에 의해 다시 용존상으로 돌아오기 때문이다(Bruland and Lohan, 2006; Anderson 2020). 아연은 이산화탄소를 탄산염으로 변환시키는 효소인 Carbonic anhydrase(Morel et al. | |
초창기의 연구를 통해 보고된 용존 미량금속 농도가 같은 해역에서 조차 매우 큰 차이를 보인 이유는 무엇인가? | 하지만 초창기의 연구를 통해 보고된 용존 미량금속 농도는 같은 해역에서조차 매우 큰 차이를 보였는데, 당시 분석 기기의 검출 감도로는 매우 낮은 미량금속의 농도 레벨을 검출하기 어려운 것도 있었지만, 해수 시료의 채수 및 전처리, 분석 시에 사용되는 용기와 시약, 그리고 주변 환경으로부터 기인한 시료의 오염이 가장 큰 문제였다. 이후 분석 기술의 발전, 클린룸에 대한 개념의 도입과 함께 2000년대 들어 시작된 국제 연구 프로그램인 GEOTRACES를 통하여 미량금속의 오염을 최소화하는 청정 해수시료 채수법이 체계적으로 정립되었고(Cutter et al. |
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