Details

Autor(en) / Beteiligte

• Du, Jianjun
• Ge, Haoying
• Gu, Quanyong
• Du, Hong
• Fan, Jiangli
• Peng, Xiaojun

Titel

Gold nanoparticle-based nano-probe for the colorimetric sensing of Cr3+ and Cr2O72− by the coordination strategyElectronic supplementary information (ESI) available: Zeta potential changes of AuNPs before and after the N-T decoration, optimal AuNPs concentration for Cr, selection of appropriate reducing agent, optimal AA concentration for Cr2O72- detection, absorption spectra of Cr2O72- before and after addition of AA, titration experiment for Cr2O72-, effect of different N-T concentrations on H

Erscheinungsjahr

2017-12

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• In this work, an N-T /gold nanoparticle system was assembled for the convenient and colorimetric identification of Cr based on its coordination chemistry with the thymine derivative ( N-T ). In addition to the visible colorimetric changes for the qualitative Cr identification, the A 630 nm/520 nm values changed linearly with Cr concentration over a range of 0.5-2.5 μM and the detection limits reached 0.03 μM and 0.07 μM for Cr 3+ and Cr 2 O 7 2− , respectively, both of which satisfied the Cr water quality standards of the U.S. EPA, WHO and China. Furthermore, a more convenient method was developed for quantitative determination of Cr concentrations in practical samples based on the Eyedropper function in Microsoft's PowerPoint software, wherein the RGB (red, green and blue) value of the sample could be easily screened in the colorimetric card for a more accurate result with good recovery, avoiding complicated instrumentation. The Eyedropper function in Microsoft PowerPoint was introduced into the gold nanoparticles-based colorimetric recognition of Cr 3+ and Cr 2 O 7 2− , which makes the quantitative determination easier, more convenient and more accurate.