| Summary: | 碩士 === 國立高雄師範大學 === 化學系 === 92 === The pretreatment technique of microwave-assisted headspace solid-phase microextraction (MA-HS-SPME) has been developed and studied for the extraction of semi-volatile compounds in aqueous samples prior to the chromatographic analysis. The optimum conditions for obtaining extraction efficiency, such as the extraction time , extraction temperature, addition of salts, and the ratio of sample to headspace volume parameters were investigated.
Experimental results indicated that the proposed MA-HS-SPME technique attained the best extraction efficiency under the optimized conditions, i.e., irradiation of extraction solution (20 ml aqueous sample in 40 ml headspace vial with no addition of salt) under 30W microwave power for 30 min at 70℃.The detection was linear at 1-250 ng/l with correlation coefficient exceeded 0.997 . The detection limit obtained were between 0.8-10.7 ng/l, repeatabilities range from 0.4 to 14.3 %. Water samples collected from a river, and from the tap were analysed using the optimised conditions.
|
|---|
