title: A novel strategy to increase performance of solid-phase microextraction fibers: electrodeposition of sol-gel films on highly porous substrate.
abstract: In the present work, the effect of substrate porosity for preparation of solid-phase microextraction (SPME) fibers was investigated. The fibers were prepared by electrodeposition of sol-gel coatings using negative potentials on porous Cu wire and compared with previous reported technique for preparation of SPME fibers using positive potentials on smooth gold wire. Porous substrate was prepared by electrodeposition of a thin layer of Cu on a Cu wire. The extraction capability of prepared fibers was evaluated through extraction of some aromatic hydrocarbons from the headspace of aqueous samples. The effect of substrate porosity and some operating parameters on extraction efficiency was optimized. The results showed that extraction efficiency of SPME fibers highly depends on porosity of the substrate. The LOD ranged from 0.005 to 0.010 ng/mL and repeatability at the 1 ng/mL was below 12%. Electrodeposited films were characterized for their surface morphology and thermal stability using SEM and thermogravimetric analysis, respectively. SEM analysis revealed formation of porous substrate and subsequently porous coating on the wire surface and thermogravimetric analysis showed high thermal stability of the prepared fiber.
authors.affiliation: Department of Chemistry, Science and Research Branch, Islamic Azad University, Tehran, Iran. paberoomand@yahoo.com
authors.forename: Parviz Aberoomand
authors.initials: PA
authors.lastname: Azar
authors.forename: Mohammad Saber
authors.initials: MS
authors.lastname: Tehrani
authors.forename: Sirwan
authors.initials: S
authors.lastname: Mohammadiazar
authors.forename: Syed Waqif
authors.initials: SW
authors.lastname: Husain
mesh_terms: D003300:Copper / Q000737:chemistry; D004595:Electroplating; D011084:Polycyclic Aromatic Hydrocarbons / Q000737:chemistry / Q000302:isolation & purification*; D011108:Polymers / Q000737:chemistry*; D016062:Porosity; D052617:Solid Phase Microextraction / Q000295:instrumentation* / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D011084:Polycyclic Aromatic Hydrocarbons; D011108:Polymers; D014874:Water Pollutants, Chemical; D003300:Copper