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.
- Publication:
-
Spectrochimica Acta Part A: Molecular Spectroscopy
- Pub Date:
- December 2014
- DOI:
- 10.1016/j.saa.2014.05.036
- Bibcode:
- 2014AcSpA.133..156M