Depth distribution of Zr and Nb in seawater: The potential role of colloids or organic complexation to explain non-scavenging-type behavior
Depth distribution of Zr and Nb in seawater: The potential role of colloids or organic complexation to explain non-scavenging-type behavior
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海水中 Zr 和 Nb 的深度分布：胶体或有机络合在解释非清除型行为中的潜在作用
DOI：
10.1016/j.marchem.2016.12.001
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发表时间：
2017
期刊：
影响因子：
3
通讯作者：
Koschinsky
中科院分区：
文献类型：
--
作者：
Poehle;Koschinsky
溶解态锆（Zr）和铌（Nb）在公海海水中的浓度较低，尽管这两种金属具有颗粒反应性，但对太平洋的研究报告称，其浓度随深度增加。在GEOTRACES M81/1（GA 11）巡航期间，在位于（亚）热带大西洋的16个站点采集的（0.2 μm过滤）和6个太平洋样本（0.2 μm和0.015 μm过滤）从热液羽流和背景海水在SO229期间收集。测量是使用我们新开发的在线预富集方法的SeaFAST系统与随后的分析电感耦合等离子体质谱仪。我们的结果表明，增加溶解锆与深度有一些明显的最大值在中间深度沿着东北-西南样带（30°N至12°S）在大西洋。沿大西洋东南-西北样带（12°S至8°N）的地表损耗沿着不太明显，在8°N的最北端的观测站几乎完全消失。溶解铌几乎是保守的分布，除了西非，在那里观察到的表面耗尽。我们认为，沉积在西非清除Zr和Nb从表面沃茨和河流排放从亚马逊可能代表一个来源到西大西洋。Zr与Si的相关性暗示了Zr与Si颗粒（如生物蛋白石）的吸收和释放的耦合。对太平洋样品粒度分级的分析排除了Zr和Nb的主要胶体组分（0.015 μm-0.2 μm）。我们认为，溶解的锆和铌可能是稳定的有机络合物在深沃茨，因为这两种元素形成非常稳定的有机分子，如铁载体的配合物。
Dissolved zirconium (Zr) and niobium (Nb) are present in open-ocean seawater in low pmol/kg concentrations and studies for the Pacific Ocean reported an increase in concentration with depth although both metals are characterized as being particle-reactive.We analyzed dissolved Zr and Nb in 194 Atlantic seawater samples (0.2 μm filtered) collected at 16 stations located in the (sub)tropical Atlantic during GEOTRACES cruise M81/1 (GA11) and 6 Pacific samples (0.2 μm and 0.015 μm filtered) collected from a hydrothermal plume and the background seawater during SO229. Measurements were done using our newly developed online-preconcentration method for the SeaFAST-system with subsequent analysis by inductively coupled plasma-mass spectrometry.Our results showed an increase in dissolved Zr with depth with some distinct maxima at intermediate depths along a NE-SW transect (30°N to 12°S) in the Atlantic. Surface depletion was less pronounced along the Atlantic SE-NW transect (12°S to 8°N) and disappeared almost completely at the northernmost station at 8°N. Dissolved Nb was almost conservatively distributed except off West Africa where a surface depletion was observed. We suggest that dust deposited off West Africa scavenged Zr and Nb from surface waters and riverine discharge from the Amazon may represent a source to the West Atlantic. The correlation of Zr with Si hints to a coupling of Zr to the uptake and release on and from Si particles such as biogenic opal.Analysis of the size-fractionated Pacific samples ruled out a significant colloidal (0.015 μm–0.2 μm) component as host for Zr and Nb. We suggest that dissolved Zr and Nb might be stabilized by organic complexation in deep waters because both elements form very stable complexes with organic molecules such as siderophores.
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影响因子：
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作者：
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期刊：
影响因子：
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作者：
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影响因子：
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作者：
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影响因子：
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作者：
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