KCS 121st General Meeting

Subject Colorimetric detection of Cr(VI) using graphene oxide as a peroxidase mimetic catalyst
Code ANAL2.O-19
Time FRI 10 : 33
Area Oral Presentation of Young Analytical Chemists II
Type Oral Presentation
Changwon National University, Korea
1Department of Chemistry, Changwon National University, Korea
Abstract A highly sensitive and selective detection of hexavalent chromium (Cr(VI)) was proposed using graphene oxide (GO) as a peroxidase mimetic catalyst. The blue colored free cation radicals were generated simply by an oxidation reaction of tetramethyl benzidine (TMB) which was catalyzed by GO. In the presence of 8-hydroxyquinoline (8-HQ), the radical consumption was monitored by the decrease of absorbance of TMB and then the recovery of blue color was observed by the addition of Cr(VI). The proposed probe exhibited high selectivity on Cr(VI) due to the formation of a chelate ring between 8-HQ and Cr(VI), inducing the recovery of the radical generation. Under the optimum experimental condition, the limit of detection was calculated to be 70 nM of Cr(VI). More importantly, this method was successfully applied to the detection of Cr(VI) in real water samples.
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