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Nanoparticles, Colloids and their relationship to Titanium, Aluminium and Iron solubility in the Open Ocean

纳米粒子、胶体及其与公海中钛、铝和铁溶解度的关系

基本信息

批准号：
54760597
负责人：
Dr. Peter Leslie Croot
金额：
--
依托单位：
Department of Earth and Ocean Sciences
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2007
资助国家：
德国
起止时间：
2006-12-31 至 2010-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/54760597?language=en
关键词：
Nanoparticles Colloids their relationship Titanium

项目摘要

We propose here to investigate in detail the marine biogeochemistry of three major crustal elements, Al, Fe and Ti which are major constituents of atmospheric dust deposited to the ocean. All 3 elements are strongly hydrolysed in seawater resulting in low solubilities and high particle reactivity resulting in low concentrations in open ocean seawater (Al: 0.3 - 90 nM, Fe: 50 - 2000 pM, Ti: 3- 300 pM). While presently there is a strong focus on the biogeochemistry of iron, there has been little work performed on Al and even less on Ti. The PI has recently developed two new voltammetric speciation techniques for Ti and Al that allow for the first time an examination of the in situ speciation and reaction kinetics of Ti and Al in open ocean seawater. The proposed work is based around a series of cruises in the Atlantic and Southern Ocean, where soluble (x < 10 kDa), colloidal (10 kDa < x < 0.2 um) and particulate (x >0.2 um) concentrations of these metals will be measured. Laboratory investigations will focus on the solubility of these elements in seawater; this is particularly important with regard to Ti, where no reliable data exist for seawater, and for all the 3 metals in understanding the transport of these metals in the Deep Ocean and supply to surface waters by upwelling and diffusion.

我们建议详细研究三种主要地壳元素Al、Fe和Ti的海洋生物地球化学，它们是沉积到海洋中的大气尘埃的主要成分。这三种元素在海水中都被强烈水解，导致低溶解度和高颗粒反应性，导致在公海海水中的浓度较低(Al：0.3-90 NM，Fe：50-2000 PM，Ti：3-300 PM)。虽然目前人们对铁的生物地球化学有很大的关注，但对铝的研究很少，对钛的研究就更少了。PI最近开发了两种新的钛和铝的伏安形态分析技术，首次实现了对钛和铝在公海海水中的原位形态和反应动力学的研究。拟议的工作以大西洋和南大洋的一系列巡航为基础，在那里将测量这些金属的可溶性(x&lt；10 kDa)、胶体(10 kDa&lt；x&lt；0.2um)和颗粒(x&gt；0.2um)浓度。实验室调查将侧重于这些元素在海水中的溶解度；这对于钛尤其重要，因为在那里没有可靠的海水数据，而且对于所有3种金属来说，都有助于了解这些金属在深海中的迁移以及通过上升流和扩散向地表水的供应。