Photometric and visual detection of Cr(VI) using gold nanoparticles modified with 1,5-diphenylcarbazide
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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
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