title: A novel magnetic ionic liquid modified carbon nanotube for the simultaneous determination of aryloxyphenoxy-propionate herbicides and their metabolites in water.
abstract: A reliable, sensitive, rapid and environmentally friendly analysis procedure for the simultaneous determination of the analytes with a wide range of polarity in the environmental water was developed by coupling dispersive magnetic solid-phase extraction (d-MSPE) with high-performance liquid chromatography (HPLC)-diode array detector (DAD) and ultra-high pressure liquid chromatography (UHPLC)-triple quadrupole mass spectrometer (MS/MS), in this work. Magnetic ionic liquid modified multi-walled carbon nanotubes (m-IL-MWCNTs) were prepared by spontaneous assembly of magnetic nanoparticles and imidazolium-modified carbon nanotubes, and used as the sorbent of d-MSPE to simultaneously extract aryloxyphenoxy-propionate herbicides (AOPPs) and their polar acid metabolites due to the excellent π-π electron donor-acceptor interactions and anion exchange ability. The factors, including the amount of sorbent, pH of the sample solution, extraction time and the volume of elution solvent were investigated. Under the optimized conditions, the proposed d-MSPE coupling to HPLC-DAD system had a satisfactory performance, the limits of detection (LODs, defined as the signal to noise ratio of 3) and the limits of quantification (LOQs, defined as the signal to noise ratio of 10) for analytes in Milli-Q water were in the range of 2.8-14.3 and 9.8-43.2 μg L(-1) respectively. Calibration curves were linear (r(2)>0.998) over the concentration range from 0.02 to 1 mg L(-1). The recoveries of the eight analytes ranged from 66.1 to 89.6% with the RSDs less than 8.6%. In order to extend the method in extremely low concentration analysis, d-MSPE-UHPLC-MS/MS was investigated, which showed better performance in terms of limit of detection and analysis time.
authors.affiliation: Department of Applied Chemistry, China Agricultural University, No.2 West Yuanmingyuan Road, Beijing 100193, PR China.
authors.forename: Mai
authors.initials: M
authors.lastname: Luo
authors.affiliation: Department of Applied Chemistry, China Agricultural University, No.2 West Yuanmingyuan Road, Beijing 100193, PR China.
authors.forename: Donghui
authors.initials: D
authors.lastname: Liu
authors.affiliation: Department of Applied Chemistry, China Agricultural University, No.2 West Yuanmingyuan Road, Beijing 100193, PR China.
authors.forename: Lu
authors.initials: L
authors.lastname: Zhao
authors.affiliation: Department of Applied Chemistry, China Agricultural University, No.2 West Yuanmingyuan Road, Beijing 100193, PR China.
authors.forename: Jiajun
authors.initials: J
authors.lastname: Han
authors.affiliation: Department of Applied Chemistry, China Agricultural University, No.2 West Yuanmingyuan Road, Beijing 100193, PR China.
authors.forename: Yiran
authors.initials: Y
authors.lastname: Liang
authors.affiliation: Department of Applied Chemistry, China Agricultural University, No.2 West Yuanmingyuan Road, Beijing 100193, PR China.
authors.forename: Peng
authors.initials: P
authors.lastname: Wang
authors.affiliation: Department of Applied Chemistry, China Agricultural University, No.2 West Yuanmingyuan Road, Beijing 100193, PR China. Electronic address: zqzhou@cau.edu.cn.
authors.forename: Zhiqiang
authors.initials: Z
authors.lastname: Zhou
keywords: Aryloxyphenoxy-propionate herbicide; Dispersive magnetic solid-phase extraction; Ionic liquid modified carbon nanotube; Metabolites