title: Substrateless graphene fiber: a sorbent for solid-phase microextraction.
abstract: In current study, a substrateless graphene fiber was successfully prepared by a simple hydrothermal strategy and used as solid-phase microextraction (SPME) sorbent. Five organochlorine pesticides (OCPs) were employed as model analytes to evaluate the performance of as-prepared graphene fiber. The results showed that the graphene fiber exhibited higher extraction efficiencies, higher thermal stability (up to 310°C), better reproducibility, and longer service life (more than 180 times reuse) than commercial fibers. In addition, the method for the determination of OCPs was proposed by coupling headspace (HS)-SPME technique with gas chromatography/electron capture detector (HS-SPME-GC/ECD). The proposed HS-SPME-GC/ECD method showed low limits of detection (0.83-11.5 ng/L), wide linear dynamic ranges (more than 2 orders of magnitude), and acceptable reproducibility (RSD<10.9%). Finally, the proposed method was successfully applied to the analysis of OCPs in environmental water samples with good recoveries (81-121%) and satisfactory precisions (RSD<9%).
authors.affiliation: Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), Department of Chemistry, Wuhan University, Wuhan 430072, China.
authors.forename: Yan-Bo
authors.initials: YB
authors.lastname: Luo
authors.forename: Bi-Feng
authors.initials: BF
authors.lastname: Yuan
authors.forename: Qiong-Wei
authors.initials: QW
authors.lastname: Yu
authors.forename: Yu-Qi
authors.initials: YQ
authors.lastname: Feng
mesh_terms: D000327:Adsorption; D002849:Chromatography, Gas; D006108:Graphite / Q000737:chemistry*; D006843:Hydrocarbons, Chlorinated / Q000032:analysis / Q000302:isolation & purification*; D010575:Pesticides / Q000032:analysis / Q000302:isolation & purification*; D052617:Solid Phase Microextraction / Q000295:instrumentation / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000302:isolation & purification
chemical_list: D006843:Hydrocarbons, Chlorinated; D010575:Pesticides; D014874:Water Pollutants, Chemical; D006108:Graphite