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首页> 外文期刊>Environmental Science & Technology >Development of a Gold Amalgam Voltammetric Microelectrode for the Determination of Dissolved Fe, Mn, O_2, and S(-Ⅱ) in Porewaters of Marine and Freshwater Sediments
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Development of a Gold Amalgam Voltammetric Microelectrode for the Determination of Dissolved Fe, Mn, O_2, and S(-Ⅱ) in Porewaters of Marine and Freshwater Sediments

机译:用于测定海洋和淡水沉积物孔隙水中溶解的Fe,Mn,O_2和S(-Ⅱ)的金汞齐伏安电极的研制

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摘要

A solid-state voltammetric gold amalgam microelec-trode has been developed for the measurement of dissolved O_2, S(-Ⅱ), Fe, and Mn in the porewaters of marine sediments. This electrode can provide more information at (sub)millimeter depth resolution on all of the major redox species found in the environment than membrane microelectrodes which usually can measure only one of these species per electrode. We describe the construction, standardization, analytical validation, and application of a microelectrode to marine sediments. The use of the microelectrode takes advantage of the fast scan voltammetric methods for simultaneous measurement of all redox species during one potential scan. Electrochemical conditioning of the solid-state microelectrode between voltage scans while deployed in waters and sediments allows for repeated use of the electrode. Finally, we demonstrate depth profiles at millimeter resolution for the redox species in a Delaware salt marsh. The profiles observed are consistent with the known biogeochemical cycling of the target redox species. In addition, we provide evidence for H_2O_2, iron(Ⅱ) sulfide complexes, and iron(Ⅲ) colloids or organic complexes in porewaters.
机译:研制了固态伏安金汞齐微电极,用于测量海洋沉积物孔隙水中溶解的O_2,S(-Ⅱ),Fe和Mn。与膜微电极相比,该电极可以在环境中发现的所有主要氧化还原物质上提供(亚)毫米深度分辨率的信息,而膜微电极通常每个电极只能测量其中一种。我们描述了微电极在海洋沉积物中的构建,标准化,分析验证和应用。微电极的使用利用了快速扫描伏安法在一次电势扫描期间同时测量所有氧化还原物质的优势。在部署在水和沉积物中的同时,在电压扫描之间对固态微电极进行电化学调节,可以重复使用电极。最后,我们演示了特拉华盐沼中氧化还原物质的毫米分辨率深度分布。观察到的剖面与目标氧化还原物质的已知生物地球化学循环一致。此外,我们为孔隙水中的H_2O_2,硫化铁(Ⅱ)络合物和铁(Ⅲ)胶体或有机络合物提供了证据。

著录项

  • 来源
    《Environmental Science & Technology》 |1995年第3期|p.751-761|共11页
  • 作者单位

    Department of Chemistry and Biochemistry and College of Marine Studies, University of Delaware, Lewes, Delaware 19958;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境化学;
  • 关键词

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