title: Preparation and evaluation of a molecularly imprinted sol-gel material for on-line solid-phase extraction coupled with high performance liquid chromatography for the determination of trace pentachlorophenol in water samples.
abstract: A highly selective imprinted amino-functionalized silica gel sorbent was prepared by combining a surface molecular imprinting technique with a sol-gel process for on-line solid-phase extraction-HPLC determination of trace pentachlorophenol (PCP) in water samples. The PCP-imprinted amino-functionalized silica sorbent was characterized by FT-IR, SEM, nitrogen adsorption and the static adsorption experiments. The imprinted functionalized silica gel sorbent exhibited high selectivity and offered a fast kinetics for the adsorption and desorption of PCP. The prepared sorbent was shown to be promising for on-line solid-phase extraction for HPLC determination of trace levels of PCP in environmental samples. With a sample loading flow rate of 5 ml min(-1) for 2 min, an enhancement factor of 670 and a detection limit (S/N = 3) of 6 ng l(-1) were achieved at a sample throughput of five samples h(-1). The precision (RSD) for nine replicate on-line sorbent extractions of 10 microgl(-1) PCP was 3.8%. The sorbent also offered good linearity (r = 0.9997) for on-line solid-phase extraction of trace levels of PCP. The method was applied to the determination of PCP in local lake water, river water and wastewater samples.
authors.affiliation: Key Laboratory of Functional Polymer Materials, The Ministry of Education of China, Research Centre for Analytical Sciences, Department of Chemistry, Nankai University, Tianjin.
authors.forename: De-Man
authors.initials: DM
authors.lastname: Han
authors.forename: Guo-Zhen
authors.initials: GZ
authors.lastname: Fang
authors.forename: Xiu-Ping
authors.initials: XP
authors.lastname: Yan
mesh_terms: D000327:Adsorption; D005591:Chemical Fractionation / Q000295:instrumentation* / Q000379:methods; D002851:Chromatography, High Pressure Liquid / Q000295:instrumentation* / Q000379:methods*; D010416:Pentachlorophenol / Q000032:analysis* / Q000737:chemistry; D058428:Silica Gel; D012822:Silicon Dioxide / Q000138:chemical synthesis*; D017550:Spectroscopy, Fourier Transform Infrared; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D014874:Water Pollutants, Chemical; D058428:Silica Gel; D012822:Silicon Dioxide; D010416:Pentachlorophenol