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Quantification of Humic Substances in Natural Water Using Nitrogen-Doped Carbon Dots
journal contribution
posted on 2017-11-17, 00:00 authored by Yan-Fang Guan, Bao-Cheng Huang, Chen Qian, Han-Qing YuDissolved
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.
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pollutant mitigationresults showDOM quantificationtest paperdetection limitpH rangenonradiation electron transfer mechanismdetection methodNitrogen-Doped Carbon Dots DissolvedNatural Waterdisinfection treatment processesHS detection rangefluorescence quenchinghumic substancesdrinking waternovel sensorsurface water samplesdetection rangeLowry methoddetection resultHS measurementHumic Substancesgeochemical circulationnitrogen-doped carbon quantum dotsnitrogen-doped carbon-dots fluorescenceHS quantification
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