|
Abstract
|
Here, a novel fluorescence probe based on graphene quantum dots (GQDs) capped with dimercaptosuccinic acid (DMSA)
and putrescine (PUT) for fast and selective determination of As(III) was reported. Electron transmission microscopy and
Fourier transform infrared spectroscopy have been used to characterize the prepared DMSA-PUT capped GQDs. Due to
high affinity of DMSA-PUT functional groups to As(III), the FL intensity of the designed DMSA-PUT capped GQDs was
linearly quenched in the presence of As(III) from 0.025 to 150 ppb with suitable reproducibility and repeatability. Fluorescence
response of DMSA-PUT capped GQDs in the presence of several ions at various pHs were studied revealing suitable
selectivity of the developed sensor for As3+.
Statistical student’s t-test analysis of the standard NIST SRM 2669 and SRM
1572b confirmed the accuracy of the method against systematic and constant errors (> 95% recovery with < 5% RSD). The
prepared fluorescent probe shows a limit of detection of 0.0132 ppb, which is appropriate for detecting hazardous As(III) in
drinkable ground waters. The developed sensor was utilized for fluorescence probing of As3+
in underground water samples
with satisfactory analytical results.
|