Colorimetric detection of chromium(VI) using graphene oxide nanoparticles acting as a peroxidase mimetic catalyst and 8-hydroxyquinoline as an inhibitor
Colorimetric detection of chromium(VI) using graphene oxide nanoparticles acting as a peroxidase mimetic catalyst and 8-hydroxyquinoline as an inhibitor
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DOI：
10.1007/s00604-018-3169-8
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发表时间：
2019-01-01
影响因子：
5.7
通讯作者：
Lee, Yong-Ill
中科院分区：
文献类型：
--
作者：
Nguyen Ngoc Nghia;Bui The Huy;Lee, Yong-Ill
本文介绍了铬酸根[铬（VI）]的比色测定方法。它基于使用氧化石墨烯（GO）纳米颗粒作为过氧化物酶模拟物。通过由GO催化的H2 O2氧化3，3，5，5-四甲基联苯胺产生蓝色。在8-羟基喹啉（8-HQ）的存在下防止该显色反应。然而，在Cr（VI）存在下，由于Cr（VI）氧化8-HQ，TMB将形成蓝色。颜色可通过分光光度法（在652 nm处）测量或目视检测。在最佳实验条件下，铬酸根浓度在50 ~ 430 nM范围内呈线性关系，检出限为5.8nM（S/N=3）。该方法具有较高的选择性，并成功地应用于加标水样中Cr（VI）的测定。
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.