title: Detection of perchlorate using Ag/DMAH(+) SERS-active capture matrices.
abstract: In this communication, the fabrication of SERS-active capture matrices for the detection of perchlorate is described. The amine groups of amine-modified magnetic microparticles were used to immobilize silver colloidal particles. Once immobilized, the silver was reacted with dimethylaminoethanethiol hydrochloride (DMAH(+)Cl(-)) to form a self-assembled monolayer (SAM). The DMAH(+) SAM exhibits reasonably good selectivity for perchlorate. It was shown that calibration curves could be generated by ratioing the perchlorate peak with a DMAH(+) peak that did not change upon interaction with the perchlorate ion. Flow experiments, using Ag/DMAH(+) capture matrices held in place by a magnet, showed instantaneous response to changes in perchlorate concentration. The use of solid phase extraction (SPE) to eliminate chloride ion interference was explored.
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.affiliation: SPAWAR Systems Center Pacific, Code 71730, San Diego, CA 92152, United States.
authors.forename: M D
authors.initials: MD
authors.lastname: Putnam
mesh_terms: D000588:Amines / Q000737:chemistry*; D004867:Equipment Design; D058185:Magnetite Nanoparticles / Q000737:chemistry*; D008958:Models, Molecular; D010472:Perchlorates / Q000032:analysis*; D012834:Silver / Q000737:chemistry*; D052616:Solid Phase Extraction; D013059:Spectrum Analysis, Raman / Q000295:instrumentation*; D013438:Sulfhydryl Compounds / Q000737:chemistry*
chemical_list: D000588:Amines; D058185:Magnetite Nanoparticles; D010472:Perchlorates; D013438:Sulfhydryl Compounds; D012834:Silver; C494474:perchlorate
keywords: Capture matrices; Perchlorate; Surface enhanced Raman scattering spectroscopy