基于ZIF-L的微固相萃取技术测定地表水中痕量典型多环芳烃

制备类沸石咪唑酯骨架ZIF-L材料,将其用作微固相萃取吸附剂,处理水中萘、苊、苊烯、芴、菲、蒽、荧蒽、芘等8种痕量典型多环芳烃,再用HPLC测定。试验表明,ZIF-L对上述多环芳烃的萃取效率明显高于商品化萃取材料C 18和多壁碳纳米管。方法在0.100μg/L^200μg/L范围内线性良好,方法检出限为0.02μg/L^0.03μg/L,标准溶液5次测定结果的RSD为4.7%~9.5%,实际水样加标回收率为84.5%~115%。将该方法用于北太湖5个点位水样的测定,测定值为未检出~3.40μg/L。

Determination of Trace Amount of Typical Polycyclic Aromatic Hydrocarbons ( PAHs) in Water by ZIF-L Micro-Solid Phase Extraction

Eight kinds of trace amount of PAHs(naphthalene,acenaphthene etc.)in surface water were extracted by zeolitic imidazolate framework ZIF-L as micro-solid phase adsorbent and determined by HPLC.The results showed that ZIF-L had better extraction efficiency for these PAHs than the commercial extraction materials like C 18 and multi-walled carbon nanotubes.The method had a good linearity in the range of 0.100μg/L to 200μg/L,the method detection limits were in 0.02μg/L^0.03μg/L.The RSDs of the standard solutions by 5 times repeated measurement were in 4.7%~9.5%.The recoveries of spiked practical samples were in 84.5%~115%.The method was applied in five sampling sites in Northern Taihu Lake,the determination results were in not detected^3.40μg/L.