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  • Title: Methylene blue-mediated electrocatalytic detection of hexavalent chromium.
    Author: Korshoj LE, Zaitouna AJ, Lai RY.
    Journal: Anal Chem; 2015 Mar 03; 87(5):2560-4. PubMed ID: 25671382.
    Abstract:
    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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