Photometric and visual detection of Cr(VI) using gold nanoparticles modified with 1,5-diphenylcarbazide
- 468 Downloads
The authors report on a colorimetric method for the determination of Cr(VI) using gold nanoparticles (AuNPs) modified with the reagent 1,5-diphenylcarbazide (DPC). The detection scheme is based on the well-known redox reaction that occurs between DPC (on the AuNPs) and Cr(VI) ion, this followed by complexation between oxidized DPC and Cr(III). This complexation then triggers aggregation of the AuNPs and a color change from red to blue. The method is highly selective for Cr(VI) and has a 0.3 μM limit of detection which is much lower than the maximal permitted level in drinking water (i.e. ~1 μM) as regulated by the Chinese Ministry of Environmental Protection. The assay was applied to the rapid determination of Cr(VI) in real environmental water and seafood samples.
KeywordsSurface plasmon resonance absorption Transmission electron microscopy Dynamic light scattering Water analysis Seafood analysis
The authors acknowledge the Natural Science Foundation of China (21277149), Zhejiang Provincial Natural Science Foundation of China (LR13B050001) and the Ningbo Science and Technology Bureau (2014B82010) for supporting this work.
Compliance with ethical standards
The author(s) declare that they have no competing interests
- 3.Ioannidou MD, Zachariadis GA, Anthemidis AN, Stratis JA (2005) Direct determination of toxic trace metals in honey and sugars using inductively coupled plasma atomic emission spectrometry. Talanta 65:92–97Google Scholar
- 4.Aydin FA, Soylak M (2010) Separation, preconcentration and inductively coupled plasma-mass spectrometric (ICP-MS) determination of thorium (IV), titanium (IV), iron (III), lead (II) and chromium (III) on 2-nitroso-1-naphthol impregnated MCI GEL CHP20P resin. J Hazard Mater 173:669–674CrossRefGoogle Scholar
- 33.Lin YH, Tseng WL (2009) Highly sensitive and selective detection of silver ions and silver nanoparticles in aqueous solution using an oligonucleotide-based fluorogenic probe. Chem Commun 6619–6620Google Scholar
- 34.Chinese National Standards: “Standards for drinking water quality of China” (GB5749-2006)Google Scholar