NDLI: Ultrasensitive, highly specific, colorimetric recognition of sulfide ions [S<sup>2−</sup>] in aqueous media: applications to environmental analysis

Content Provider	Royal Society of Chemistry (RSC)
Author	Kondekar, Uttam R. Walekar, Laxman S. Anbhule, Prashant V. Patil, Shivajirao R. Gore, Anil H. Han, Sung H. Kolekar, Govind B.
Copyright Year	2015
Abstract	Herein, we have demonstrated a simple, ultrasensitive and highly specific colorimetric assay for the detection of sulfide ions (S2−) based on the aggregation of nanoparticles via electrostatic interaction of a surface capped gold nanoparticles with S2− in aqueous media. Cetylpyridinium bromide capped gold nanoparticles (CPB-AuNPs) were synthesized by a borohydride chemical reduction method and further characterized using UV-visible and fluorescence spectroscopy, transmission electron microscopy (TEM), dynamic light scattering (DLS) and zeta potential measurements. The change in color from red to purple immediately after the addition of S2− in the solution of CPB-AuNPs was first monitored by the naked eye and then by UV-vis spectroscopy to construct calibration plot for practical applications. Under the optimized circumstances, a plot of [(A0 − A)/A] versus the concentrations of S2− was linear over the range of 0.01–1.0 μg mL−1 with a correlation coefficient of 0.9952. The developed method also shows excellent selectivity towards S2− by a factor of 20-fold or more relative to sixteen interfering ions that were tested. The probe offers a low limit of detection (LOD) up to 0.0013 μg mL−1 (40.6 nM), which is much lower (about 400-fold) than the maximum level (0.5 μg mL−1 or 15 625 nM) of S2− in drinking water permitted by the World Health Organization (WHO). Moreover, our results demonstrate the practical applicability of the probe for S2− sensing in environmental water samples without pretreatment or use of a masking agent. Therefore, the proposed scheme could be a good alternative means for onsite and real time screening of S2−.
Starting Page	2547
Ending Page	2553
Page Count	7
File Format	HTM / HTML PDF
ISSN	17599660
Volume Number	7
Issue Number	6
Journal	Analytical Methods
DOI	10.1039/c4ay03048f
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Sulfide Spectroscopy Borohydride World Health Organization Transmission electron microscopy Ultraviolet\u2013visible spectroscopy Dynamic light scattering Zeta potential Fluorescence Correlation and dependence Bromide
Content Type	Text
Resource Type	Article
Subject	Analytical Chemistry Engineering Chemical Engineering

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