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  • Title: Highly sensitive detection of chromium (III) ions by resonance Rayleigh scattering enhanced by gold nanoparticles.
    Author: Chen M, Cai HH, Yang F, Lin D, Yang PH, Cai J.
    Journal: Spectrochim Acta A Mol Biomol Spectrosc; 2014 Jan 24; 118():776-81. PubMed ID: 24144831.
    Abstract:
    Simple and sensitive determination of chromium (III) ions (Cr(3+)) has potential applications for detecting trace contamination in environment. Here, the assay is based on the enhancement of resonance Rayleigh scattering (RRS) by Cr(3+)-induced aggregation of citrate-capped gold nanoparticles (AuNPs). Transmission electron microscopy (TEM) and UV-vis absorption spectroscopy were employed to characterize the nanostructures and spectroscopic properties of the Cr(3+)-AuNP system. The experiment conditions, such as reaction time, pH value, salt concentration and interfering ions, were investigated. The combination of signal amplification of Cr(3+)-citrate chelation with high sensitivity of RRS technique allow a selective assay of Cr(3+) ions with a detection limit of up to 1.0 pM. The overall assay can be carried out at room temperature within only twenty minutes, making it suitable for high-throughput routine applications in environment and food samples.
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