Graphene quantum dot as a green and facile sensor for free chlorine in drinking water.
Summary of "Graphene quantum dot as a green and facile sensor for free chlorine in drinking water."
Free chlorine was found to be able to destroy the passivated surface of the graphene quantum dots (GQDs) obtained by pyrolyzing citric acid, resulting in significant quenching of their fluorescence (FL) signal. After optimizing some experimental conditions (including response time, concentration of GQDs, and pH value of solution), a green and facile sensing system has been developed for the detection of free residual chlorine in water based on FL quenching of GQDs. The sensing system exhibits many advantages, such as short response time, excellent selectivity, wide linear response range and high sensitivity. The linear response range of free chlorine (R2=0.992) was from 0.05 µM to 10 µM. The limit of detection (S/N=3) was as low as 0.05 µM, which is much lower than that of the most widely used N-N-diethyl-p-phenylenediamine (DPD) colorimetric method. This sensing system was finally used to detect free residual chlorine in local tap water samples. The result agreed well with that by the DPD colorimetric method, suggesting the potential application of this new, green, sensitive and facile sensing system in drinking water quality monitoring.
Affiliation
Journal Details
This article was published in the following journal.
Name: Analytical chemistry
ISSN: 1520-6882
Pages:
Links
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/22957474
- DOI: http://dx.doi.org/10.1021/ac301945z
Medical and Biotech [MESH] Definitions
Dichloroacetate
An acetic acid derivative that is a metabolite of TRICHLOROETHYLENE and is formed during chlorine disinfection of drinking water. It has effects on GLUCOSE metabolism, lowers LACTATE, and activates the PYRUVATE DEHYDROGENASE COMPLEX.
Quantum Dots
Nanometer sized fragments (the dots) of semiconductor crystalline material which emit PHOTONS. The wavelength is based on the quantum confinement size of the dot. They are brighter and more persistent than organic chemical INDICATORS. They can be embedded in MICROBEADS for high throughput ANALYTICAL CHEMISTRY.
Chlorine Compounds
Inorganic compounds that contain chlorine as an integral part of the molecule.
Alcohol Drinking
Behaviors associated with the ingesting of alcoholic beverages, including social drinking.
Hypochlorous Acid
An oxyacid of chlorine (HClO) containing monovalent chlorine that acts as an oxidizing or reducing agent.
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