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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472 EISSN: 1735-1472
Vol. 12, No. 3, 2015, pp. 1021-1028
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Bioline Code: st15094
Full paper language: English
Document type: Research Article
Document available free of charge
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International Journal of Environment Science and Technology, Vol. 12, No. 3, 2015, pp. 1021-1028
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Functionalized gold nanoparticles for the detection of nitrates in water
Mura, S.; Greppi, G.; Roggero, P. P.; Musu, E.; Pittalis, D.; Carletti, A.; Ghiglieri, G. & Irudayaraj, J.
Abstract
A rapid and sensitive colorimetric assay was
developed using cysteamine modified gold nanoparticles
for the direct detection of nitrates in water samples. Gold
nanoparticles stabilized with citrate were modified with
cysteamine that has excellent affinity for nitrates, and its
capacity to capture nitrates was evaluated, in comparison
with other anions. The presence of nitrates in water samples
could be tracked by naked eye with a color variation of
the colloidal suspension from red to gray, and these results
were confirmed through ultraviolet–visible measurements
within a nitrate concentration of 35 ppm. In field analysis
was performed in underground water extracted from wells
during the year 2012 in Arborea area (Italy), a nitrate
vulnerable zone, and information of nitrate concentration
in the range of the recommended nitrate level in water was
studied. This simple assay can be used for onsite detection
of nitrates in water without the need for skilled personnel,
sample pretreatment or expensive instrumentation.
Keywords
Nanoparticles; Nitrates; Ultraviolet–visible; Colorimetric test kit; Water
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