Citation:
ZHANG Teng, ZHONG Yi-Han, ZHANG Shou-Ting, DANG Xin-Yu, LU Xiao-Quan. A Sensitive Colorimetric Method for Detection of Chromium Ion(Ⅲ) Based on Surface Plasmon Resonance Effect of Gold Nanoparticles[J]. Chinese Journal of Analytical Chemistry,
;2019, 47(9): 1373-1381.
doi:
10.19756/j.issn.0253-3820.191306
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A method was proposed for the effective and accurate colorimetric detection of ultra-trace trivalent chromium ions (Cr3+) in water based on citric acid-modified gold nanoparticles (CA-AuNPs). CA-AuNPs under different pH conditions were prepared by in-situ reduction at 273 K. After adding ultra-trace Cr3+, the color change of the system was visible to the naked eye, and the color changed from red to dark gray or colorless, other metal ions (Na+, Ca2+, Co2+, Zn2+, Cu2+, Fe2+, Mg2+, Al3+, Fe3+) showed no significant changes. The proposed sensing strategy coupled with spectroscopic detection method showed a low detection limit of 40.7 nmol/L(3σ) for detection of Cr3+ in drinking water, which was lower than that of the national standard method. And a minimum concentration of 1.0×10-5 mol/L for Cr3+ could be detected with naked eyes. This visual sensor based on CA-AuNPs had low detection limit and high selectivity, which would play an important role in drug analysis, clinical diagnosis and environmental monitoring.
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