Methylene Blue-Mediated Electrocatalytic Detection of Hexavalent Chromium

We report, for the first time, the design and fabrication of an electrochemical ion (E-ION) sensor for highly specific detection of hexavalent chromium (Cr­(VI)). Unlike previously developed electrochemical Cr­(VI) sensors, the sensing mechanism relies on the previously unexplored electrocatalytic r...

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Bibliographic Details
Published inAnalytical chemistry (Washington) Vol. 87; no. 5; pp. 2560 - 2564
Main Authors Korshoj, Lee E, Zaitouna, Anita J, Lai, Rebecca Y
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 03.03.2015
Subjects
Analytical chemistry
Aquifers
Biosensing Techniques
Carbon
Chromium
Chromium - analysis
Compatibility
Detection
Electrochemical Techniques - methods
Electrodes
Gold - chemistry
Hexavalent chromium
Methylene
Methylene Blue - chemistry
Sensors
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Summary:We report, for the first time, the design and fabrication of an electrochemical ion (E-ION) sensor for highly specific detection of hexavalent chromium (Cr­(VI)). Unlike previously developed electrochemical Cr­(VI) sensors, the sensing mechanism relies on the previously unexplored electrocatalytic reaction between Cr­(VI) and surface-immobilized methylene blue (MB). The sensor is sensitive, specific, and selective enough to be used in a synthetic aquifer sample. Like many sensors of this class, it is also reagentless, reusable, and compatible with gold-plated screen-printed carbon electrodes. Despite the difference in the sensing mechanism, this E-ION Cr­(VI) sensor possesses attributes similar to other MB-based electrochemical sensors, sensors with potential for real world applications.
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ISSN:0003-2700
1520-6882
DOI:10.1021/acs.analchem.5b00197