|
چکیده
|
Chemiluminescence (CL) is the emission of electromagnetic radiation (usually visible and nearinfrared region) from a chemical reaction which is usually exothermic [1]. Generally, the analytical methods based on CL reactions can be used for determination of various substances such as pharmaceuticals, metal cations and environmental pollutants, among others. In this study, we report the application of CL reaction of graphene quantum dots (GQDs) for measurement of sodium dodecyl sulfate (SDS).To this aim, GQDs were simply synthesized by pyrolysis of glucose [2]. Then, the prepared GQDs were characterized by ultraviolet and visible (UV-VIS) spectroscopy, fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD) and also transmission electron microscopy (TEM). It was found that GQDs in the presence of cetyltrimethylammonium bromide (CTMAB) and in alkaline medium led to emission of light. In order to obtain highest light emission, the concentrations of reactants involved in the CL reaction were optimized. After optimization, our preliminary tests revealed that SDS could inhibit the CL reaction of GQDs. The inhibitory effect of SDS was linearly proportional with concentration of SDS in the range of 3.5 × 10-3 – 5.2 × 10-2 mol/L. The limit of detection of CL method and its relative standard deviation were 1.1 × 10-3 mol/L and 2% (n=5), respectively. The method possessed acceptable selectivity and can be exploited for determination of SDS in various water samples beside to detergent samples.
|