10.1021/acs.est.7b04430.s001
Yan-Fang Guan
Yan-Fang
Guan
Bao-Cheng Huang
Bao-Cheng
Huang
Chen Qian
Chen
Qian
Han-Qing Yu
Han-Qing
Yu
Quantification
of Humic Substances in Natural Water
Using Nitrogen-Doped Carbon Dots
American Chemical Society
2017
pollutant mitigation
results show
DOM quantification
test paper
detection limit
pH range
nonradiation electron transfer mechanism
detection method
Nitrogen-Doped Carbon Dots Dissolved
Natural Water
disinfection treatment processes
HS detection range
fluorescence quenching
humic substances
drinking water
novel sensor
surface water samples
detection range
Lowry method
detection result
HS measurement
Humic Substances
geochemical circulation
nitrogen-doped carbon quantum dots
nitrogen-doped carbon-dots fluorescence
HS quantification
2017-11-17 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Quantification_of_Humic_Substances_in_Natural_Water_Using_Nitrogen-Doped_Carbon_Dots/5659006
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.