Partitioning and transport of metals across the O2H2S interface in a permanently anoxic basin: Framvaren Fjord, Norway☆
Partitioning and transport of metals across the O2H2S interface in a permanently anoxic basin: Framvaren Fjord, Norway☆
复制标题
DOI：
10.1016/0016-7037(85)90293-5
复制
发表时间：
1985-06
影响因子：
5
通讯作者：
Luc Jacobs;S. Emerson;J. Skei
中科院分区：
文献类型：
--
作者：
Luc Jacobs;S. Emerson;J. Skei
在缺氧海洋沃茨中对金属起作用的地球化学过程影响金属的流动性和向沉积物的运输方式，其方式不同于在好氧制度中所观察到的方式。为了更好地了解这些过程，溶解和颗粒锰，铁，钴，镍，铜，锌，镉的浓度进行了测定，在一个永久缺氧盆地，Framvaren峡湾，挪威的水柱。类特定的行为决定了这些金属参与氧化还原循环过程中的O2 H2 S界面和金属硫化物沉淀在硫化物水中的程度。金属硫化物沉淀影响沉积物中金属富集的程度。过渡金属，锰，铁，钴，表现出积极参与氧化还原循环，其特征在于溶解的最大值正好低于O 2 H 2 S界面。镍浓度似乎不受影响其他金属轮廓的工艺的影响。的金属，铜，锌，镉，显示一个显着的溶解度下降的界面，不参与氧化还原循环，并富集在沉积物中相对于成岩成分的因素分别为11，105，和420。金属和硫化物的离子活度积提供了证据，表明与纯金属硫化物固相的化学平衡不是控制含硫化物沃茨中溶解金属浓度的主要过程。
The geochemical processes operating on metals in anoxic marine waters influence metal mobility and mode of transport to the sediments in a manner different from that observed in oxic regimes. In order to better understand these processes, dissolved and particulate Mn, Fe, Co, Ni, Cu, Zn, and Cd concentrations were determined in the water column of a permanently anoxic basin, Framvaren Fjord, Norway. Class specific behavior determines the degree to which these metals are involved in the processes of redox cycling at the O 2 H 2 S interface and metal sulfide precipitation in the sulfidic water. Metal sulfide precipitation influences the magnitude of metal enrichment in the sediments. The transition metals, Mn, Fe, and Co, show active involvement in redox cycling, characterized by dissolved maxima just below the O 2 H 2 S interface. Nickel concentrations appear unaffected by processes influencing the profiles of the other metals. The metals, Cu, Zn, and Cd, display a dramatic solubility decrease across the interface, are not involved in redox cycling, and are enriched in the sediments relative to a lithogenic component by factors of 11, 105, and 420, respectively. Ion activity products of the metals and sulfide provide evidence that chemical equilibria with a pure metal sulfide solid phase is not the dominant process controlling dissolved metal concentrations in the sulfide containing waters.