| Summary: | 碩士 === 淡江大學 === 水資源及環境工程學系 === 90 === The Solid Phase Microextration (SPME) offers high selectivity and high extraction. SPME for extraction as an effective analytical method also consists of clean-up in the preconcentration procedure. SPME technique have been widely used in environmental analysis. In this study, SPME combines gas chromatograph - ion trap mass spectrometry (GC-ITMS) was used to determine organotin compounds in seawater. Organotin compounds generally used RnSnX4-n to present. Especially butyltins (BTs) and phenyltins (PhTs) are the most toxic. BTs includes butyltin Trichloride (MBT)、dibutyltin dichloride (DBT) and tributyltin chloride (TBT), and PhTs includes phenyltin trichloride (MPhT)、diphenyltin chloride (DPhT) and triphenyltin chloride (TPhT).
In this study, the difference of headspace-SPME and immersion-SPME was compared. The organotin compounds were as the target compounds. Immersion extraction method has shown better results. The method detection limit (MDL) of headspace-SPME for MBT、DBT、TBT are 15.6、16.4、13.5 ng Sn/L, respectively. The MDL of Immersion-SPME for MBT、DBT、TBT、MPhT、DPhT、TPhT are 8.9、4.3、13.5、12.9、9.3、11.4 ng Sn/L. The real seawater samples from eight suspected polluted areas were collected. The results showed that concentration of these samples were in the range 16.8 ~ 46.4 ng Sn/L for MBT, 7.85 ~ 19.6 ng Sn/L for DBT, 36.6 ~ 146.5 ng Sn/L for TBT, and recovery rates of MBT、DBT、TBT were between 74﹪and 94﹪in the real seawater.
Comparison of the two relatively standard deviation (RSD), using two internal standard Tri-n-Propyltin chloride (TPrT) and Tributyltin chloride-d27 (TBT-d27) are comparable. However the RSD for analyzing the PTs using Triphenyltin cloride-d15 (TPhT-d15) as the internal standard were better than TPrT.
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