A multi-residue method for the determination of pesticides in tea using multi-walled carbon nanotubes as a dispersive solid phase extraction absorbent.
A modified QuEChERS (quick, easy, cheap, effective, rugged and safe) method using multi-walled carbon nanotubes (MWCNTs) as a dispersive solid phase extraction (d-SPE) absorbent was established for analysis of 78 pesticide residues in tea. A 6 mg MWCNT sample was selected as the optimised amount based on the distribution of pesticide recoveries and clean-up efficiency from 6 mL acetonitrile extracts. The matrix effects of the method were evaluated and matrix-matched calibration was recommended. The method was validated employing gas chromatography coupled to tandem mass spectrometry (GC-MS/MS) at the spiked concentration levels of 0.05, 0.1 and 0.15 mg kg(-1). For most of the targeted pesticides, the percent recoveries range from 70% to 120%, with relative standard deviations (RSDs) <20%. The linear correlation coefficients (r(2)) were higher than 0.99 at concentration levels of 0.025-0.500 mg kg(-1). In this study, MWCNTs were proved to be a promising d-SPE absorbent with excellent cleanup efficiency, which could be widely applied for the analysis of pesticide residues.
Center of Analysis and Testing, Sichuan Academy of Agricultural Sciences, Chengdu 610066, PR China; Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, PR China; University of Chinese Academy of Sciences, Beijing 100039, PR China. Electronic address: houxue127@163.com.
Xue
X
Hou
Center of Analysis and Testing, Sichuan Academy of Agricultural Sciences, Chengdu 610066, PR China.
Shaorong
S
Lei
Center of Analysis and Testing, Sichuan Academy of Agricultural Sciences, Chengdu 610066, PR China.
Shiting
S
Qiu
Center of Analysis and Testing, Sichuan Academy of Agricultural Sciences, Chengdu 610066, PR China.
Lingan
L
Guo
Center of Analysis and Testing, Sichuan Academy of Agricultural Sciences, Chengdu 610066, PR China.
Shengguo
S
Yi
Center of Analysis and Testing, Sichuan Academy of Agricultural Sciences, Chengdu 610066, PR China.
Wei
W
Liu
D000327:Adsorption; D005506:Food Contamination / Q000032:analysis*; D008401:Gas Chromatography-Mass Spectrometry; D037742:Nanotubes, Carbon / Q000737:chemistry*; D010573:Pesticide Residues / Q000737:chemistry / Q000302:isolation & purification*; D052616:Solid Phase Extraction / Q000295:instrumentation / Q000379:methods*; D013662:Tea / Q000737:chemistry*
D037742:Nanotubes, Carbon; D010573:Pesticide Residues; D013662:Tea
GC–MS/MS; MWCNTs; PTV; Pesticide residues; QuEChERS; Tea