Journal
ANALYTICA CHIMICA ACTA
Volume 605, Issue 1, Pages 80-86Publisher
ELSEVIER
DOI: 10.1016/j.aca.2007.10.024
Keywords
surface-enhanced Raman spectroscopy; uranium detection; groundwater; gold nanoparticles
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Techniques for rapid screening of uranium in environmental samples are needed, and this study entails the development of surface-enhanced Raman scattering (SERS) for analyzing uranium in aqueous media with improved sensitivity and reproducibility. A new SERS substrate based on (aminomethyl)phosphonic acid (APA)-modified gold nanoparticles was found to give greater than three orders of magnitude SERS enhancement compared with unmodified bare gold nanoparticles. Intensities of uranyl band at about 830 cm(-1) were proportional to the concentrations of uranium in solution, especially at relatively low concentrations (<10(-5) M). A detection limit of similar to 8 x 10(-1) M was achieved with a good reproducibility since the measurement was performed directly in dispersed aqueous suspension. Without pretreatment, the technique was successfully employed for detecting uranium in a highly contaminated groundwater with a low pH, high dissolved salts (e.g., nitrate, sulfate, calcium and aluminum) and total organic carbon. (c) 2007 Elsevier B.V. All rights reserved.
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