| Sol-Gel Technology was used to produce novel stir bar coatings to be used for Stir Bar Sorptive Extraction of analytes of different polarities and partition coefficients. Naphthalene, 3,3',4,4'-tetrachlorobiphenyl and pentachlorophenol were extracted using stir bars (HPBars) coated with poly(dimethylsiloxane) (PDMS), poly(dimethylsiloxane)-co-diphenylsiloxane(5%) (PDMS-co-DPS(5%)) and poly(ethylene glycol) (PEG).; Limits of detection for naphthalene were found to be 0.680 mug/mL, 0.770 mug/mL, and 3.70 mug/mL for the PDMS, PDMS-co-DPS(5%), and PEG-coated HPBars, respectively. Limits of detection for 3,3',4,4'-tetrachlorobiphenyl were found to be 0.72 ng/mL, 0.89 ng/mL, and 2.50 ng/mL for the PDMS, PDMS-co-DPS(5%), and PEG-coated HPBars, respectively. Limits of detection for pentachlorophenol were found to be 7.20 ng/mL, 5.40 ng/mL, and 0.54 ng/mL for the PDMS, PDMS-co-DPS(5%), and PEG-coated HPBars, respectively. Therefore, the polar PEG coating had the greatest extraction efficiency and sensitivity for pentachlorophenol.; The Linear Dynamic Ranges for naphthalene using the PDMS-coated HPbar, for 3,3',4,4'-tetrachlorobiphenyl using the PDMS-do-DPS(5%)-coated HPBar, and for PCP using the PEG-coated HPBar were 0.7 mug/mL--5 mug/mL, 0.9 ng/mL--174 ng/mL, and 0.5 ng/mL--1000 ng/mL, respectively.; Competition and interference effects were analyzed by extraction from a multianalyte solution, and a solution made with water obtained from the Rideau River. It was found that the presence of other analytes and organic compounds decreased the partition coefficients of the analytes of interest, but the general trends remained the same. |
