Study On Acf-spme Technology And Its Application In Fast Detection Marine

Pollutants in all kinds of water systems will end at sea water by natural recovery. So pollutants in ocean are completed. Wastes are always diluted by infinite proportion with sea water. So concentration of pollutants in sea water is trace-level, while because of this, people often ignore the environment problems of ocean system. Trace-level do not mean small capability to contaminate. These organic pollutants mostly have strong bioaccumulation. Ocean environment and human health are invaded step by step. At present, operating requirements of the collecting and detecting process of marine samples with many substances and low content are significantly improved. Human need more quick and advanced detection technique for ocean. Activated carbon fiber- solid-phase micro-extraction (ACF-SPME) technique based on solid-phase micro-extraction (SPME), and it is good for quick test in sea water. The technique is simple, fast, solvent free, highly sensitive and portable like SPME. The key to SPME technique lies in the performance of extraction fiber. So ACF-SPME used ACF instead of commercial covering fiber, which is low thermal, chemical stability and short life time.This paper based on the back research, makes a special modification of the ACF to improve the extraction capability by modifier soaking combined with activation in the high-temperature vapor, using the ACF as the extraction fiber successfully detected special organic pollutants in seawater samples, such as endocrine disrupting chemical and petroleum additive. The main contents include: 1. In order to improve the extraction capability of NP, organic modifier soaking connected with activation in the high-temperature vapor was used to modify the ACF. The modified optimal conditions of activated carbon fibers are: the carbon fiber impregnate in the 30% trimethylamine for 36h, then activated in the high-temperature vapor for 30min. The activation temperature is 550℃. Compared with the non-modified carbon fibers, the extraction capability was improved 50%. 2. The modified ACF was used to analysis NP successfully in marine water. The optimal conditions are: direct extract for 20 min in the 70℃water bath, while stirring, salt concentration 5 % and pH 6, then desorb in 320℃for 10 min. The optimized method had an acceptable linearity between 1μg/L and 100μg/L, and the limits of the detection were 0.1μg/L, with R.S.D. values <10% for each compound. In the system of seawater, the recovery of the method is 101.2%, and the method could use in the system of seawater. 3. ACF-SPME was used to analysis MTBE successfully in marine water. The optimal conditions are: head-space extract for 20min in the 40℃water bath, while stirring, salt concentration 25% and pH 8, then desorb in 180℃for 1min. The optimized method had an acceptable linearity between 1μg/L and 200μg/L, and the limits of the detection were 0.1μg/L, with R.S.D. values <10% for each compound. In the system of seawater, the recovery of the method is above 90%. 4. ACF-SPME was used to analysis 4-BP successfully in marine water. The optimal conditions are: head-space extract for 40min in the 50℃water bath, while stirring, salt concentration 25% and pH 4, then desorb in 270℃for 3min. The optimized method had an acceptable linearity between 5μg/L and 500μg/L, and the limits of the detection were 1μg/L, with R.S.D. values <10% for each compound. In the system of seawater, the recovery of the method has been researched. And feasibility of the method has been proved.