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• Main Authors: Chia-yu Chang, 張家瑜
• Other Authors: Wang-hsien Ding
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/82641706283015024991

碩士 === 國立中央大學 === 化學學系 === 103 === Short chain chlorinated paraffins (SCCPs) are polychlorinated n-alkanes with carbon chain lengths from 10 to 13 and a chlorination degree between 30 and 72% by mass. SCCPs are resistant to environmental degradation and also have characteristics such as bioaccumulation and long-range transport. A global ban on SCCPs is being considered under the Stockholm Convention on Persistent Organic Pollutants, so it is necessary to develop a simple, efficient and robust method to monitor SCCPs in the environment. In this study, vortex-assisted liquid-liquid microextraction (VALLME) coupled with GC/ECNI-MS was developed and used to determine SCCPs in water samples. The optimized procedure of VALLME were as follows: 400 μL of dichloromethane was rapidly injected into a 20 mL water sample. After vortex for 1 min at 2500 rpm and centrifugation for 3 min at 4500 rpm, the mixture became a two-phase solution. Then the sedimented phase was transferred to the vial and evaporated to dryness by a gentle stream of nitrogen. Prior to analysis, 10 μL of acetone containing internal standard was added in the vial and 1μL was injected into GC/ECNI-MS for analysis.We also used a method termed vortex-assisted enrichment-enhanced liquid-liquid microextraction (VAEELLME) in the analysis of real water samples.With this method, we can obtain higher enrichment and lower detection limit. The limit of detection (LOD) for SCCPs in water samples was determined to be 0.02 μg/L. The relative standard deviations (RSDs) of inter-days and intraday tests were lower than 9% and the SCCPs levels in water samples ranged from 0.08 to 0.16 μg/L.