US GEOTRACES GP17-OCE: Hydrogen sulfide as a strong ligand affecting the speciation and solubility of key trace metals

US GEOTRACES GP17-OCE:硫化氢作为强配体影响关键痕量金属的形态和溶解度

基本信息

项目摘要

Trace metals are present at very low parts per trillion concentrations in the ocean but in spite of their scarcity many, like iron and zinc, are essential to the growth of the microscopic plants called phytoplankton. Others, like mercury and arsenic, are toxic. In addition to very low concentrations, the essential or toxic nature of a trace metal also depends on the chemical form of the element – as a free dissolved ion all by itself or as charged ion interacting with other inorganic or organic ions. One of the inorganic ions in seawater that strongly interacts with trace metals is bisulfide, the ionic form of the foul-smelling gas hydrogen sulfide. Its reactivity with metals can be so strong that it forms metal-sulfide particles that sink out and are removed from the water. This research project will study how hydrogen sulfide interacts with trace metals like cadmium, copper, mercury, nickel, and zinc to form dissolved complexes that make these metals less reactive to other ions and phytoplankton, or insoluble particles that remove the metals. The researchers will conduct these studies on an oceanographic expedition from Tahiti to the ice edge around Antarctica to Chile as part of the U.S. GEOTRACES program with many other researchers measuring trace metals from the surface to the ocean bottom. All of this and more will be the subject of a graduate student’s doctoral research. In addition to learning how to work on a major oceanographic expedition and with other researchers, she will communicate her experiences and findings on a blog available to all who follow it. She will also help to create a presentation about her science that will be part of the “Sailing with GEOTRACES” virtual reality experience for schools, libraries/museums, festivals, and public presentations.The US GEOTRACES GP17-OCE cruise from Tahiti to the Antarctic ice edge to Chile will sample waters with large gradients in phytoplankton biomass and species, macronutrients, and trace metals. With anticipated changes in the concentrations and phases of hydrogen sulfide in the oxic water column, the transect offers an ideal opportunity to quantify the linked cycles of hydrogen sulfide and bioactive metals like cadmium, copper, and zinc, and the toxic element mercury. With an overall goal of quantifying the coupled cycles of trace metals and sulfide in the upper, oxic ocean, our specific research objectives for this research will be: (1) Quantify the sources and sinks of dissolved and particulate sulfide as it pertains to the cycling of key trace metals in order to accurately link their cycles; (2) Establish the conditions under which free sulfide reacts with and precipitates trace metals such as cadmium, copper, and zinc, and quantify this removal term; and (3) Evaluate whether nanoparticulate/colloidal pyrite exists in hydrothermal plumes and its contribution to iron transport relative to colloidal iron oxyhydroxides. A fully integrated set of shipboard measurements, laboratory studies, and data synthesis and speciation modeling are designed to meet these objectives. The approach includes close collaborations with investigations of dissolved and particulate trace metals and their speciation, as well as with those studying mixing processes using a variety of tracers.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.
微量金属在海洋中的浓度非常低,但尽管它们稀缺,但许多金属,如铁和锌,对称为浮游植物的微观植物的生长至关重要。其他的,如汞和砷,是有毒的。除了非常低的浓度外,微量金属的基本或毒性性质还取决于元素的化学形式-作为自由溶解离子本身或作为带电离子与其他无机或有机离子相互作用。海水中与痕量金属强烈相互作用的无机离子之一是二硫化物,即恶臭气体硫化氢的离子形式。它与金属的反应性非常强,可以形成金属硫化物颗粒,这些颗粒会下沉并从水中去除。该研究项目将研究硫化氢如何与镉,铜,汞,镍和锌等微量金属相互作用,形成溶解的复合物,使这些金属对其他离子和浮游植物的反应性降低,或去除金属的不溶性颗粒。研究人员将在从塔希提岛到南极洲周围的冰边缘到智利的海洋学考察中进行这些研究,作为美国GEOTRACES计划的一部分,许多其他研究人员将测量从表面到海底的痕量金属。所有这些和更多的将是一个研究生的博士研究的主题。除了学习如何在大型海洋学考察中与其他研究人员合作外,她还将在博客上与所有关注者交流她的经验和发现。她还将帮助创建一个关于她的科学的演示文稿,该演示文稿将成为学校,图书馆/博物馆,节日,美国GEOTRACES GP 17-OCE从塔希提岛到南极冰缘再到智利的巡航将对浮游植物生物量和物种、常量营养素和微量金属梯度较大的沃茨进行采样。随着含氧水体中硫化氢浓度和相态的预期变化,该断面提供了一个理想的机会来量化硫化氢和生物活性金属(如镉、铜和锌)以及有毒元素汞的相关循环。以定量研究上层含氧海洋中痕量金属和硫化物的耦合循环为总体目标,本研究的具体研究目标是:(1)定量研究溶解态和颗粒态硫化物的源和汇,因为它与关键痕量金属的循环有关,以便准确地联系它们的循环;(2)确立游离硫化物与镉、铜、锌等微量金属反应并析出的条件,并对该去除项进行量化;以及(3)评价热液羽流中是否存在纳米颗粒/胶体黄铁矿及其相对于胶体铁羟基氧化物对铁输运的贡献。一套完全集成的船上测量,实验室研究,数据合成和形态建模的目的是为了满足这些目标。该方法包括与溶解和颗粒痕量金属及其形态的调查密切合作,以及与使用各种示踪剂研究混合过程的人员密切合作。该奖项反映了NSF的法定使命,并通过使用基金会的知识价值和更广泛的影响审查标准进行评估,被认为值得支持。

项目成果

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Gregory Cutter其他文献

Gregory Cutter的其他文献

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{{ truncateString('Gregory Cutter', 18)}}的其他基金

Old Dominion University/Synthetic Conducting Cable for Trace Metal-clean Sampling Winch SSSE
旧道明大学/用于微量金属清洁采样绞车 SSSE 的合成导电电缆
  • 批准号:
    2118915
  • 财政年份:
    2021
  • 资助金额:
    $ 46.54万
  • 项目类别:
    Standard Grant
Collaborative Research: Management and Implementation of US GEOTRACES GP17 Section: South Pacific and Southern Ocean (GP17-OCE)
合作研究:美国GEOTRACES GP17部分的管理和实施:南太平洋和南大洋(GP17-OCE)
  • 批准号:
    2023315
  • 财政年份:
    2020
  • 资助金额:
    $ 46.54万
  • 项目类别:
    Standard Grant
Collaborative Research: Management and Implementation of US GEOTRACES Pacific Meridional Transect
合作研究:美国GEOTRACES太平洋经向断面的管理和实施
  • 批准号:
    1658318
  • 财政年份:
    2017
  • 资助金额:
    $ 46.54万
  • 项目类别:
    Continuing Grant
US GEOTRACES PMT: hydrogen sulfide as a strong ligand affecting trace metal cycling
US GEOTRACES PMT:硫化氢作为影响痕量金属循环的强配体
  • 批准号:
    1737342
  • 财政年份:
    2017
  • 资助金额:
    $ 46.54万
  • 项目类别:
    Standard Grant
GEOTRACES Arctic Section: Processes affecting the biogeochemical cycling of essential and toxic metalloids in the Arctic Ocean
GEOTRACES 北极部分:影响北冰洋必需和有毒类金属生物地球化学循环的过程
  • 批准号:
    1435708
  • 财政年份:
    2015
  • 资助金额:
    $ 46.54万
  • 项目类别:
    Standard Grant
Collaborative Research: Management and Implementation of the US Arctic GEOTRACES Study
合作研究:美国北极GEOTRACES研究的管理和实施
  • 批准号:
    1355913
  • 财政年份:
    2014
  • 资助金额:
    $ 46.54万
  • 项目类别:
    Standard Grant
Collaborative Research: Management and Implementation of US GEOTRACES Eastern Pacific Zonal Transect
合作研究:美国GEOTRACES东太平洋地带样带的管理和实施
  • 批准号:
    1130245
  • 财政年份:
    2012
  • 资助金额:
    $ 46.54万
  • 项目类别:
    Standard Grant
US GEOTRACES Pacific section: Characterizing the redox environment of the eastern tropical Pacific Ocean
US GEOTRACES 太平洋部分:描述东热带太平洋的氧化还原环境
  • 批准号:
    1235328
  • 财政年份:
    2012
  • 资助金额:
    $ 46.54万
  • 项目类别:
    Standard Grant
GEOTRACES Zonal Atlantic Section: Arsenic and phosphorus biogeochemistry
GEOTRACES 大西洋分区:砷和磷生物地球化学
  • 批准号:
    0929537
  • 财政年份:
    2010
  • 资助金额:
    $ 46.54万
  • 项目类别:
    Standard Grant
Collaborative Research: A Linked Initiative for Developing Minority Doctoral Scholars in Ocean Sciences, Phase 2
合作研究:培养海洋科学少数族裔博士学者的关联倡议,第二阶段
  • 批准号:
    0914433
  • 财政年份:
    2009
  • 资助金额:
    $ 46.54万
  • 项目类别:
    Standard Grant

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US GEOTRACES GP17-ANT: Dissolved Gallium, Barium, and Vanadium as interface, process, and circulation tracers in the Amundsen Sea
US GEOTRACES GP17-ANT:溶解的镓、钡和钒作为阿蒙森海中的界面、过程和循环示踪剂
  • 批准号:
    2242222
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Collaborative Research: US GEOTRACES GP17-ANT: Nitrogen isotope dynamics on the Amundsen Sea continental margin
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  • 批准号:
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Collaborative Research: US GEOTRACES GP17-OCE and -ANT Sections: External sources, cycling and processes affecting mercury in the South Pacific and Southern Oceans
合作研究:US GEOTRACES GP17-OCE 和 -ANT 部分:影响南太平洋和南大洋汞的外部来源、循环和过程
  • 批准号:
    2349825
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    2023
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合作研究:美国 GEOTRACES GP17-ANT:追踪南极大陆边缘阿蒙森海区铝、锰和铁的输入和运输
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