title: Magnetic metal-organic frameworks coated stir bar sorptive extraction coupled with GC-MS for determination of polychlorinated biphenyls in fish samples.
abstract: In this work, several kinds of the metal-organic framework (MOF) were evaluated the adsorption performance to PCB. Finally, MOF-5(Fe) was introduced in stir bar sorptive extraction (SBSE) as the adsorbent to extract six polychlorinated biphenyls (PCBs). Nd-Fe-B permanent magnet was employed as stir bar, which was then coated with Fe3O4-MOF-5(Fe) composite magnetic material, which was prepared by solvothermal method. The stir bar was then employed to extract and enrich six indicator PCBs (2,2',5,5'-tetrachlorobiphenyl, 2,2',4,5,5'-pentachlorobiphenyl, 2,2',3,4,4',5-hexachlorobiphenyl, 2,3,4,4,5-pentachlorobiphenyl, 2,2',4,4',5,5'-hexachlorobiphenyl, 2,2',3,4,4',5,5'-heptachlorobiphenyl) under stirring, then eluted by n-hexane under ultrasound. Its saturated adsorption amount was found to be 17.0-17.8 mg g(-1) and only 30 min were needed to reach adsorption equilibrium. The MOF-stir bar can be reused for 60 times with the recovery above 80%, which exhibited good stability. Under the optimal experimental conditions, MOF-5(Fe) based SBSE was coupled with GC-MS for detecting six PCBs. The limits of detection (S/N=3) of the developed method were 0.061-0.096 ng g(-1), with enrichment factors of 50-100 fold. And the linear ranges were 0.01-500 μg L(-1). The new method was successfully applied to assess PCBs in fish samples with satisfactory recovery ranging from 94.3% to 97.5%.
authors.affiliation: Faculty of Material Science and Chemical Engineering, Ningbo University, Ningbo 315211, China.
authors.forename: Saichai
authors.initials: S
authors.lastname: Lin
authors.affiliation: Faculty of Material Science and Chemical Engineering, Ningbo University, Ningbo 315211, China. Electronic address: ganning@nbu.edu.cn.
authors.forename: Ning
authors.initials: N
authors.lastname: Gan
authors.affiliation: Faculty of Marine Science, Ningbo University, Ningbo 315211, China.
authors.forename: Li
authors.initials: L
authors.lastname: Qiao
authors.affiliation: Faculty of Material Science and Chemical Engineering, Ningbo University, Ningbo 315211, China.
authors.forename: Jiabin
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Faculty of Material Science and Chemical Engineering, Ningbo University, Ningbo 315211, China.
authors.forename: Yuting
authors.initials: Y
authors.lastname: Cao
authors.affiliation: School of Food Science and Engineering, Nanjing University of Finance & Economics, Nanjing 210007, China.
authors.forename: Yinji
authors.initials: Y
authors.lastname: Chen
mesh_terms: D000327:Adsorption; D000818:Animals; D005591:Chemical Fractionation / Q000379:methods*; D052203:Ferrosoferric Oxide / Q000737:chemistry*; D005399:Fishes; D005504:Food Analysis; D005506:Food Contamination / Q000032:analysis; D008401:Gas Chromatography-Mass Spectrometry; D006586:Hexanes / Q000737:chemistry; D009942:Organometallic Compounds / Q000737:chemistry*; D011078:Polychlorinated Biphenyls / Q000032:analysis* / Q000737:chemistry / Q000302:isolation & purification*; D015203:Reproducibility of Results; D012997:Solvents / Q000737:chemistry; D013696:Temperature
chemical_list: D006586:Hexanes; D009942:Organometallic Compounds; D012997:Solvents; D011078:Polychlorinated Biphenyls; D052203:Ferrosoferric Oxide
keywords: Fish samples; GC–MS; Magnetic metal-organic frameworks; PCBs; Stir bar sorptive extraction