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首页> 外文期刊>Environmental Science & Technology >On-Site Measurement of Trace-Level Sulfide in Natural Waters by Vapor Generation and MicroChannel Collection
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On-Site Measurement of Trace-Level Sulfide in Natural Waters by Vapor Generation and MicroChannel Collection

机译：通过蒸气发生和微通道收集现场测量天然水中的痕量硫化物

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摘要

Aqueous sulfide plays an important role in the environment even at low concentrations. However, it is unstable, which means field samples cannot be transported to the laboratory for analysis without fixation. In this work, a novel method was developed to determine trace levels of sulfide on site. This method is based on vapor generation and collection in a special micro-channel device followed by fluorescence measurement (VG-^GAS). The microchannel scrubber gave a high enrichment factor, and a high sensitivity was achieved, which allowed measurement of nanomolar (nM) levels of sulfide. The theoretical approach to vapor generation for several compounds is discussed to evaluate the applicability of the method to these analytes, and compounds having a low Henry's law constant (<1 MatmT1) are suitable to measure by VG-fiGAS. Under optimized conditions, concentrations of 1.0-100 nM of sulfide could be measured. The sulfide contents of hot spring, aquarium, pond, and seawater were successfully measured by this method. Nanomolar levels of sulfide could be measured on site without loss of analyte, and results were obtained instantly in the field, both of which are advantageous for effective field surveys. The method was also applied to field measurements of aqueous sulfide in the Ariake Sea and Lake Baikal.
机译：硫化水即使在低浓度下也对环境起着重要作用。但是，它是不稳定的，这意味着现场样品未经固定就无法运输到实验室进行分析。在这项工作中，开发了一种新颖的方法来确定现场的痕量硫化物。此方法基于蒸气在特殊的微通道设备中生成和收集，然后进行荧光测量（VG- ^ GAS）。微通道洗涤塔具有较高的富集系数，并具有很高的灵敏度，可测量纳摩尔（nM）硫化物的含量。讨论了几种化合物产生蒸气的理论方法，以评估该方法对这些分析物的适用性，具有较低亨利定律常数（<1 MatmT1）的化合物适合通过VG-fiGAS测量。在优化的条件下，可以测量1.0-100 nM的硫化物浓度。用这种方法成功地测量了温泉，水族馆，池塘和海水中的硫化物含量。可以在现场测量硫化物的纳摩尔浓度而不会损失分析物，并且可以在现场立即获得结果，这两者对于有效的现场调查都是有利的。该方法还适用于有明海和贝加尔湖中硫化水的现场测量。

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  • 来源
    《Environmental Science & Technology》 |2011年第13期|p.5622-5628|共7页
  • 作者

    Kei Toda; Haruka Kuwahara; Shin-Ichi Ohira;

  • 作者单位

    Department of Chemistry, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan;

    Department of Chemistry, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan;

    Department of Chemistry, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan;

  • 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
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