Selective optical recognition and quantification of parts per million levels of Cr(6+) in aqueous and organic media by immobilized polypyridyl complexes on glass.

Selective optical sensing of parts per million levels of Cr(6+) in water under acidic conditions with robust, osmium-chromophore-based monolayers is demonstrated. The sensor system can be reset by washing with water at neutral pH and can be readily monitored by UV/vis spectroscopy.