Ethylenediaminetetraacetic Acid Functionalized Gold Nanoparticles for Sensitive Colorimetric Detection of Chromium(III) |
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| Authors: | Jiao Li Jianxiu Du Jianhuai Zhang |
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| Affiliation: | 1. Key Laboratory of Analytical Chemistry for Life Science of Shaanxi Province, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710062, China, Tel: +86?029?81530726;2. Fax: +86?029?81530727;3. The Middle School Attached to Northwestern Polytechnical University, Xi'an 710072, China |
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| Abstract: | A cost‐effective and sensitive colorimetric method was described for the determination of chromium(III) ion (Cr3+) by using ethylenediaminetetraacetic acid functionalized gold nanoparticles (EDTA‐AuNPs) as a probe. The stable and dispersed EDTA‐AuNPs were prepared by reducing HAuCl4 with sodium borohydride in presence of EDTA as a capping agent. Upon the addition of Cr3+, the colour of EDTA‐AuNPs solution changed from red to violet, which was in response to the surface plasmon absorption of dispersed and aggregated EDTA‐AuNPs. The procedure allowed the determination of Cr3+ in the range of 0.1–1.0 mol/L. The limit of detection for Cr3+ was 0.08 mol/L. The relative standard deviation was 2.5 % for eight repeated measurements of 0.6 mol/L Cr3+ solution. The method was applied to the determination of Cr3+ in water samples. |
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| Keywords: | Chromium(III) ion Colorimetry Gold nanoparticles Ethylenediaminetetraacetic acid |
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