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Quantification of Humic Substances in Natural Water Using Nitrogen-Doped Carbon Dots

机译：氮掺杂碳点量化天然水中的腐殖质

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摘要

Dissolved organic matter (DOM) is ubiquitous in aqueous environments and plays a significant role in pollutant mitigation, transformation and organic geochemical circulation. DOM is also capable of forming carcinogenic byproducts in the disinfection treatment processes of drinking water. Thus, efficient methods for DOM quantification are highly desired. In this work, a novel sensor for rapid and selective detection of humic substances (HS), a key component of DOM, based on fluorescence quenching of nitrogen-doped carbon quantum dots was developed. The experimental results show that the HS detection range could be broadened to 100 mg/L with a detection limit of 0.2 mg/L. Moreover, the detection was effective within a wide pH range of 3.0 to 12.0, and the interferences of ions on the HS measurement were negligible. A good detection result for real surface water samples further validated the feasibility of the developed detection method. Furthermore, a nonradiation electron transfer mechanism for quenching the nitrogen-doped carbon-dots fluorescence by HS was elucidated. In addition, we prepared a test paper and proved its effectiveness. This work provides a new efficient method for the HS quantification than the frequently used modified Lowry method in terms of sensitivity and detection range.
机译：溶解有机物（DOM）在水环境中无处不在，并且在污染物缓解，转化和有机地球化学循环中起着重要作用。 DOM还能够在饮用水的消毒处理过程中形成致癌副产物。因此，非常需要用于DOM量化的有效方法。在这项工作中，基于氮掺杂碳量子点的荧光猝灭，开发了一种新颖的传感器，用于快速选择性地检测腐殖质（HS）（DOM的关键成分）。实验结果表明，HS的检测范围可以扩大到100 mg / L，检测限为0.2 mg / L。此外，该检测在3.0至12.0的宽pH范围内均有效，并且离子对HS测量的干扰可以忽略不计。真实地表水样品的良好检测结果进一步验证了该检测方法的可行性。此外，阐明了通过HS猝灭氮掺杂碳点荧光的非辐射电子转移机理。此外，我们准备了一份试卷并证明了其有效性。就灵敏度和检测范围而言，这项工作提供了一种比常用的改良Lowry方法更有效的HS定量方法。

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  • 来源
    《Environmental Science & Technology》 |2017年第24期|14092-14099|共8页
  • 作者

    Guan Yan-Fang; Huang Bao-Cheng; Qian Chen; Yu Han-Qing;

  • 作者单位

    Univ Sci & Technol China, Dept Chem, CAS Key Lab Urban Pollutant Convers, Hefei 230026, Anhui, Peoples R China;

    Univ Sci & Technol China, Dept Chem, CAS Key Lab Urban Pollutant Convers, Hefei 230026, Anhui, Peoples R China;

    Univ Sci & Technol China, Dept Chem, CAS Key Lab Urban Pollutant Convers, Hefei 230026, Anhui, Peoples R China;

    Univ Sci & Technol China, Dept Chem, CAS Key Lab Urban Pollutant Convers, Hefei 230026, Anhui, Peoples R China;

  • 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);
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  • 正文语种 eng
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