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首页> 外文期刊>Marine Chemistry >Automated on-line flow-injection ICP-MS determination of trace metals (Mn, Fe, Co, Ni, Cu and Zn) in open ocean seawater: Application to the GEOTRACES program
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Automated on-line flow-injection ICP-MS determination of trace metals (Mn, Fe, Co, Ni, Cu and Zn) in open ocean seawater: Application to the GEOTRACES program

机译：自动化在线流动注射ICP-MS测定海水中痕量金属（Mn，Fe，Co，Ni，Cu和Zn）：在GEOTRACES程序中的应用

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摘要

Large programs in chemical oceanography currently require the determination of multiple trace elements in hundreds to thousands of open ocean seawater samples. For example, the international GEOTRACES program would benefit greatly from rapid, precise, automated, multi-element analytical methods for multiple trace metals in seawater. An automated, on-line extraction, flow-injection ICP-MS method is presented here for simultaneous determination of Mn, Fe, Co, Ni, Cu and Zn in open ocean seawater samples. A fully automated commercially available system buffers the pH of the samples on-line and extracts the metals of interest from 9 mL of seawater onto a chelation resin column, which is then eluted (1.6 M HNO_3) directly into a magnetic sector ICP-MS. The resulting transient peaks elute in 45 μL (～30 s) yielding a preconcentration factor of～200, and the total analysis cycle requires 8.75 min per sample. Elemental concentrations are calculated from integrated peak areas using a combination of isotope dilution and matrix-matched standard curves. Procedural blanks determined at periodic intervals (every 10 samples) throughout each sample run are used for blank correction and for calculating detection limits (range 0.3 to 16 pmol kg~(-1) seawater for these elements). Replicate analyses of a Ross Sea in-house consistency standard and four GEOTRACES reference seawater materials (Atlantic and Pacific, surface and deep water) are used to demonstrate precision of 1-3% (RSD) and very good agreement with reference consensus values for all elements except Co. Determined Co concentrations are -40% lower than consensus values, consistent with the presence of strong Co ligands in seawater, and the absence of a UV-oxidation step in this method. As illustrated by oceanographically consistent profiles at the GEOTRACES Atlantic and Pacific baseline stations, this method provides highly precise measurement of trace metals over the full range of concentrations occurring in the global ocean. Moreover, the full methodology, including flow-injection hardware and control software, is readily transferable to other users.
机译：目前，化学海洋学的大型计划要求确定数百至数千个开放海洋海水样品中的多种微量元素。例如，国际GEOTRACES计划将从对海水中多种痕量金属的快速，精确，自动化，多元素分析方法中受益匪浅。本文介绍了一种自动在线萃取，流动注射ICP-MS方法，用于同时测定海水中的锰，铁，钴，镍，铜和锌。全自动的市售系统可在线缓冲样品的pH值，并将感兴趣的金属从9 mL海水中提取到螯合树脂柱上，然后将其洗脱（1.6 M HNO_3）直接进入磁性ICP-MS。产生的瞬态峰在45μL（〜30 s）内洗脱，产生的预浓系数为〜200，每个样品的总分析周期为8.75分钟。使用同位素稀释和基质匹配的标准曲线从积分峰面积计算元素浓度。在每个样品运行中以定期间隔（每10个样品）确定的程序空白用于空白校正和计算检测极限（这些元素的范围为0.3至16 pmol kg〜（-1）海水）。对罗斯海公司内部一致性标准和四种GEOTRACES参考海水材料（大西洋和太平洋，地表和深水）进行重复分析，以证明其精度为1-3％（RSD），并与所有参考参考值非常吻合元素中除Co以外的元素。确定的Co浓度比共识值低-40％，这与海水中存在强Co配体以及该方法中没有UV氧化步骤相一致。正如GEOTRACES大西洋和太平洋基线站的海洋学一致剖面所说明的那样，此方法可对全球海洋中发生的所有浓度范围内的痕量金属进行高精度测量。而且，包括流量注入硬件和控制软件在内的完整方法论也很容易转移给其他用户。

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  • 来源
    《Marine Chemistry》 |2013年第20期|71-80|共10页
  • 作者

    M.E. Lagerstroem; M.P. Field; M. Seguret; L Fischer; S. Hann; R.M. Sherrell;

  • 作者单位

    Institute of Marine and Coastal Sciences. Rutgers University, New Brunswick, NJ 08901, USA;

    Institute of Marine and Coastal Sciences. Rutgers University, New Brunswick, NJ 08901, USA,Elemental Scientific, 1500 North 24th Street, Omaha, NE 68110, USA;

    Institute of Marine and Coastal Sciences. Rutgers University, New Brunswick, NJ 08901, USA;

    Department of Chemistry, University of Natural Resources and Life Sciences, 1190 Vienna, Austria;

    Department of Chemistry, University of Natural Resources and Life Sciences, 1190 Vienna, Austria;

    Institute of Marine and Coastal Sciences. Rutgers University, New Brunswick, NJ 08901, USA,Department of Earth and Planetary Sciences, Rutgers University, Piscataway, NJ 08854, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Trace metals; Seawater; ICP-MS; Flow injection; Isotope dilution; Automation; Chelating resin; GEOTRACES;

    机译：痕量金属;海水;ICP-MS;流动注射;同位素稀释;自动化;螯合树脂;地理轨迹;

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