Methylene blue-mediated electrocatalytic detection of hexavalent chromium

Lee E. Korshoj, Anita J. Zaitouna, Rebecca Y. Lai

Research output: Contribution to journalArticlepeer-review

72 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)2560-2564
Number of pages5
JournalAnalytical Chemistry
Issue number5
StatePublished - Mar 3 2015

ASJC Scopus subject areas

  • Analytical Chemistry


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