title: Metal organic frameworks (MOFs) for magnetic solid-phase extraction of pyrazole/pyrrole pesticides in environmental water samples followed by HPLC-DAD determination.
abstract: Magnetic metal-organic frameworks (MOFs, [MIL-101]) were prepared and used as magnetic solid-phase extraction (MSPE) adsorbents for preconcentration of four kinds of pyrazole/pyrrole pesticides (flusilazole, fipronil, chlorfenapyr, and fenpyroximate) in environmental water samples, followed by high-performance liquid chromatography-diode-array detector (HPLC-DAD) determination. Several variables affecting MSPE efficiency were systematically investigated, including amount of MIL-101, extraction time, sample pH, salt concentration, type of desorption solvent and desorption number of times. Under optimized conditions, excellent linearity was achieved in the range of 5.0-200.0μg/L for flusilazole and fipronil, and 2.0-200.0μg/L for chlorfenapyr and fenpyroximate, with correlation coefficients r>0.9911. Limits of detection and quantification were 0.3-1.5μg/L and 1.0-5.0μg/L, respectively. The intra-day and inter-day precision (relative standard deviation, n=6, %) at three spiked levels were 1.1-5.4% and 3.9-7.8% in terms of peak area, respectively. The method recoveries at three fortified concentration levels ranged from 81.8% to 107.5% for reservoir water samples, 81.0-99.5% for river water samples, and 80.2-106.5% for seawater samples. The developed MOFs based MSPE coupled with HPLC method proved to be a convenient, rapid and eco-friendly alternative to the sensitive determination of pyrazole/pyrrole pesticides with high repeatability and excellent practical applicability.
authors: School of Environmental & Municipal Engineering, Qingdao Technological University, Qingdao 266033, China. Electronic address: majiping2012@163.com.
authors: Jiping
authors: J
authors: Ma
authors: School of Environmental & Municipal Engineering, Qingdao Technological University, Qingdao 266033, China.
authors: Zhidan
authors: Z
authors: Yao
authors: School of Environmental & Municipal Engineering, Qingdao Technological University, Qingdao 266033, China.
authors: Liwei
authors: L
authors: Hou
authors: Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China.
authors: Wenhui
authors: W
authors: Lu
authors: School of Environmental & Municipal Engineering, Qingdao Technological University, Qingdao 266033, China.
authors: Qipeng
authors: Q
authors: Yang
authors: Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China.
authors: Jinhua
authors: J
authors: Li
authors: Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China. Electronic address: lxchen@yic.ac.cn.
authors: Lingxin
authors: L
authors: Chen
mesh_terms: D002851:Chromatography, High Pressure Liquid; D002857:Chromium / Q000737:chemistry*; D056831:Coordination Complexes / Q000737:chemistry*; D052203:Ferrosoferric Oxide / Q000737:chemistry; D005618:Fresh Water / Q000032:analysis; D060328:Magnetic Phenomena; D000073396:Metal-Organic Frameworks / Q000737:chemistry*; D010575:Pesticides / Q000032:analysis* / Q000737:chemistry; D011720:Pyrazoles / Q000032:analysis* / Q000737:chemistry; D011758:Pyrroles / Q000032:analysis* / Q000737:chemistry; D012623:Seawater / Q000032:analysis; D012822:Silicon Dioxide / Q000737:chemistry; D052616:Solid Phase Extraction; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry
chemical_list: D056831:Coordination Complexes; C000589635:MIL-101; D000073396:Metal-Organic Frameworks; D010575:Pesticides; D011720:Pyrazoles; D011758:Pyrroles; D014874:Water Pollutants, Chemical; D002857:Chromium; D012822:Silicon Dioxide; D052203:Ferrosoferric Oxide
keywords: Magnetic solid-phase extraction; Metal-organic frameworks (MOFs); Pyrazole; Pyrrole; Water samples