title: Determination of pesticides by capillary chromatography and SERS detection using a novel Silver-Quantum dots "sponge" nanocomposite.
abstract: In this work the at-line capillary-liquid chromatography-(microdispenser)-surface-enhanced Raman spectroscopy coupling was investigated and applied to the determination of pesticides. The use of a microdispenser combined with the use of a precise and reproducible surface enhanced Raman spectroscopy (SERS) substrate yielded a chromatographic detection system with excellent analytical properties. The microdispenser was coupled to a moving CaF₂ hot (80 °C) plate using a flow-through microdispenser interface to collect the microdrops. Ag-QD nanocomposites, which are highly reproducible thanks to their sponge-shaped structure, were used as substrate with which to measure the SERS spectra in each spot of the plate. The limits of detection ranged from 0.2 to 0.5 ng of pesticide injected (chlortoluron, atrazine, diuron and terbuthylazine) and the precision ranged between 10.2 and 12.5%.
authors.affiliation: Institute of Chemical Technologies and Analytics, Vienna University of Technology, Getreidemarkt 9/164 AC, A-1060 Vienna, Austria.
authors.forename: Carolina
authors.initials: C
authors.lastname: Carrillo-Carrión
authors.forename: Bartolomé M
authors.initials: BM
authors.lastname: Simonet
authors.forename: Miguel
authors.initials: M
authors.lastname: Valcárcel
authors.forename: Bernhard
authors.initials: B
authors.lastname: Lendl
mesh_terms: D002853:Chromatography, Liquid / Q000379:methods*; D006358:Hot Temperature; D057230:Limit of Detection; D016014:Linear Models; D053761:Nanocomposites / Q000737:chemistry*; D010575:Pesticides / Q000032:analysis* / Q000302:isolation & purification; D045663:Quantum Dots; D015203:Reproducibility of Results; D012834:Silver / Q000737:chemistry*; D013059:Spectrum Analysis, Raman / Q000295:instrumentation* / Q000379:methods*
chemical_list: D010575:Pesticides; D012834:Silver