固相微萃取活性炭涂层萃取头的制备及其对卤代烃化合物的萃取

利用自制的有机硅树脂胶粘剂和粉状活性炭制成活性炭涂层萃取头。该萃取头富集能力强,对氯仿、四氯化碳、三氯乙烯、四氯乙烯4种卤代烃化合物的富集率达到13.8~18.7倍;热稳定性好,最高使用温度可达290 ℃;使用寿命长,250 ℃解吸条件下可反复使用140次以上。上述4种化物固相微萃取-气相色谱分析的结果表明,方法的最低检出质量浓度为0.008~0.05 μg/L。采用该萃取头对含有该4种卤代烃化合物的实际水样进行了SPME-GC分析,4种化合物的回收率为95.5%~104.6%。

Preparation of a Novel Activated Carbon Coating Fiber for Solid Phase Micro-Extraction and Its Application for Halocarbon Compound Analysis in Water

A novel activated carbon coating fiber used for solid phase micro-extraction (SPME) was prepared using activated carbon powder and silica resin adhesive. The extraction properties of the novel activated carbon coating fiber were investigated. The results indicate that this coating fiber has high concentration ability, with enrichment factors for chloroform, carbon tetrachloride, trichloroethylene and tetrachloroethylene in the range of 13.8 to 18.7. The fiber is stable at temperature as high as 290 degrees C and it can be used for over 140 times at 250 degrees C. The activated carbon coating fiber was then applied to the analysis of the four halocarbon compounds mentioned above. A linear correlation with correlation coefficients between 0.995 2 and 0.999 4 and the detection limits between 0.008 and 0.05 microg/L were observed. The method was also applied to a real water sample analysis and the recoveries of these halocarbon compounds were from 95.5% to 104.6%.