title: Methylene blue-mediated electrocatalytic detection of hexavalent chromium.
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.
authors: Department of Chemistry, University of Nebraska-Lincoln , Lincoln, Nebraska 68588-0304, United States.
authors: Lee E
authors: LE
authors: Korshoj
authors: Anita J
authors: AJ
authors: Zaitouna
authors: Rebecca Y
authors: RY
authors: Lai
mesh_terms: D015374:Biosensing Techniques; D002857:Chromium / Q000032:analysis*; D055664:Electrochemical Techniques / Q000379:methods*; D004566:Electrodes; D006046:Gold / Q000737:chemistry*; D008751:Methylene Blue / Q000737:chemistry*
chemical_list: D002857:Chromium; C074702:chromium hexavalent ion; D006046:Gold; D008751:Methylene Blue