| Nowadays,commercial solid phase microextraction?SPME?coatings exist some drawbacks include fragility of fiber support,poor thermal instability and solvent resistance,fewer species,high cost and short life-time,restrict its further application.Therefore,in this paper we prepared Au-coating,mercaptoundecanol modified Au-coating and Au/Ag coated SPME fiber using chemical deposition and electrochemical deposition.Besides,the effects of extraction parameters were investigated and the extraction properties of the fibers were studied.Coupled to high performance liquid chromatography with UV detector?HPLC-UV?,the optimized SPME method was applied to the analysis of PAHs in real water samples.The contents and results will be demonstrated as follows:In Chapter 1, the development, theories, influential factors, types of extraction coating, related preparation technology and practical application of the SPME were introduced. The aim and significance of the study were also discussed.In Chapter 2, a novel cedar-like Au nanoparticles?AuNPs? coating was fabricated on an etched stainless steel?ESS? wire by direct chemical deposition and used as an efficient and unbreakable SPME fiber. The fabricated fiber exclusively exhibited excellent extraction efficiency and selectivity for some aromatic hydrocarbons. The fiber exhibits good stability and withstands at least 200 extraction and desorption replicates. The limits of detection for different PAHs ranged from 0.008 ?g·L-1 to 0.037 ?g·L-1. The recovery of polycyclic aromatic hydrocarbons in real water samples ranged from 94.38% to 106.2% with the RSD below 6.44%.In Chapter 3, a novel organic-inorganic composite coated fiber was developed by direct chemical deposition of AuNPs followed by self-assembly of mercaptoundecanol using an etched stainless steel?ESS? wire as a supporting substrate for SPME. This fiber exhibits high extraction capability and better selectivity for PAHs. Moreover, the main parameters affecting extraction were investigated. Under the optimized conditions, the developed method showed good linearity between 0.05 and 300 mg L-1. The limits of detection for different PAHs ranged from 0.010 to 0.044 mg L-1. The recovery of aromatic hydrocarbons in real water samples ranged from 98.66% to 102.4% with the RSD below 6.52%.In Chapter 4, a silver and gold nanoparticles?Ag/AuNPs? composite coating was immobilized on an stainless steel wire by electrochemical deposition for efficient SPME. The Ag/AuNPs coated etched stainless steel?ESS/Ag/AuNPs? fiber was applied to SPME of PAHs. Compared with the AuNPs, the property of the fiber has been changed. The prepared fiber exhibited excellent extraction efficiency and selectivity for some PAHs. Furthermore, the main experimental parameters were examined. The developed method showed good linearity between 0.06 and 300 mg L-1. Under the optimized experimental conditions, the limits of detection for different PAHs ranged from 0.014 ?g·L-1 to 0.040 ?g·L-1. The recovery of aromatic hydrocarbons in real water samples ranged from 93.40% to 103.3% with the RSD below 5.88%. |
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