title: Detection of hexavalent chromium using gold/4-(2-mercaptoethyl) pyridinium surface enhanced Raman scattering-active capture matrices.
abstract: In this communication, the fabrication of SERS-active capture matrices for the detection of hexavalent chromium is described. The amine groups of amine-modified magnetic microparticles were used to immobilize gold colloidal particles. Once immobilized, the gold was reacted with 4-(2-mercaptoethyl) pyridinium (MEP) hydrochloride to form a self-assembled monolayer (SAM). The MEP SAM exhibits great selectivity for hexavalent chromium. It was shown that calibration curves could be generated by ratioing MEP peaks that increased in intensity upon complexation with chromate with a peak that did not change. Flow experiments, using Au/MEP capture matrices held in place by a magnet, showed instantaneous response to changes in chromate concentration.
authors.affiliation: SPAWAR Systems Center Pacific, Code 71730, San Diego, CA 92152, United States. Electronic address: pam.boss@navy.mil.
authors.forename: P A
authors.initials: PA
authors.lastname: Mosier-Boss
authors.forename: M D
authors.initials: MD
authors.lastname: Putnam
keywords: Capture matrices; Hexavalent chromium; Surface enhanced Raman scattering spectroscopy