Colorimetric detection of chromium(VI) using graphene oxide nanoparticles acting as a peroxidase mimetic catalyst and 8-hydroxyquinoline as an inhibitor

被引：49
作者：
Nguyen Ngoc Nghia [1 ]
Bui The Huy [1 ,2 ]
Lee, Yong-Ill [1 ]
机构：
[1] Changwon Natl Univ, Dept Chem, Chang Won 51140, South Korea
[2] Duy Tan Univ, Inst Res & Dev, 3 Quang Trung, Danang, Vietnam
来源：
MICROCHIMICA ACTA | 2019年 / 186卷 / 01期
基金：
新加坡国家研究基金会;
关键词：
Colorimetricassay; Carbon nanomaterial; Chromate; Chelate; Graphene oxide; CR-VI; AQUEOUS-SOLUTIONS; SELECTIVE DETECTION; CR(VI); ADSORPTION; SPECIATION; REMOVAL; WATER; HETEROJUNCTION; HYBRIDIZATION;
D O I：
10.1007/s00604-018-3169-8
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
A method is described for the colorimetric determination of chromate [chromium(VI)]. It is based on the use of graphene oxide (GO) nanoparticles acting as a peroxidase mimic. A blue color is generated by oxidation of 3,3,5,5-tetramethylbenzidine by H2O2 which is catalyzed by GO. This color-forming reaction is prevented in the presence of 8-hydroxyquinoline (8-HQ). However, in the presence of Cr(VI), the blue color will be formed from TMBowing to the oxidation of the inhibitor8-HQ by Cr(VI). The color can be measured by a spectrophotometry (at 652nm) or detected visually. Under optimal experimental conditions, response is linear in the 50 to 430nM range of chromate concentration, and the limit of detection is 5.8nM (at S/N=3). The assay is highly selective and was successfully applied to the determination of Cr(VI) in spiked water samples.
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页数：7
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