Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore.
J Chromatogr A. 2011 Nov 25;1218(47):8490-5. doi: 10.1016/j.chroma.2011.09.077. Epub 2011 Oct 6.
Zeolite imidazolate framework 8 (ZIF-8) has permanent porosity, high surface area, hydrophobic property, open metal sites and remarkable water stability. These novel properties characterize the material as being different from other moisture sensitive metal-organic frameworks and endow ZIF-8 with the potential to extract trace analytes from environmental water samples. In the present study, ZIF-8 was synthesized and used as a sorbent for micro-solid-phase extraction of 6 polycyclic aromatic hydrocarbons (PAHs) from environmental water samples for the first time. Parameters influencing the extraction efficiency such as desorption time, extraction time, desorption solvent and salt concentration were investigated. Environmental water samples collected from a local lake were processed using this novel μ-SPE procedure. ZIF-8 proved to be a very efficient extraction sorbent for the extraction of trace analytes from water samples. The limits of detection from gas chromatography-mass spectrometric analysis of PAHs were 0.002-0.012 ng/ml. The linear ranges were 0.1-50 or 0.5-50 ng/ml. The relative standard deviations for five replicates of the extractions were in the range of 2.1-8.5%.
沸石咪唑酯骨架 8（ZIF-8）具有永久孔隙率、高表面积、疏水性、开放金属位点和卓越的水稳定性。这些新型特性使该材料有别于其他对湿度敏感的金属有机骨架，并使 ZIF-8 具有从环境水样中提取痕量分析物的潜力。在本研究中，首次合成了 ZIF-8 并将其用作微固相萃取吸附剂，从环境水样中萃取 6 种多环芳烃（PAHs）。考察了影响萃取效率的参数，如解吸时间、萃取时间、解吸溶剂和盐浓度。使用这种新型 μ-SPE 程序处理了从当地湖泊采集的环境水样。ZIF-8 被证明是一种非常有效的萃取吸附剂，可从水样中萃取痕量分析物。气相色谱-质谱分析测定多环芳烃的检出限为 0.002-0.012ng/ml。线性范围为 0.1-50 或 0.5-50ng/ml。五次萃取重复的相对标准偏差在 2.1-8.5%范围内。
