[Determination of 12 azole fungicide residues in beans and corn by offline disperse solid phase extraction and gas chromatography-negative chemical ionization mass spectrometry].
A confirmatory method is proposed for the determination of 12 azole fungicide residues in beans and corn with the technique of offline disperse solid phase extraction (DSPE) and gas chromatography-negative chemical ionization mass spectrometry (GC-NCI/MS). The pesticides interested were extracted from the samples with acetonitrile containing 1% acetic acid and simultaneous liquid-liquid partitioning formed by adding anhydrous magnesium sulfate plus sodium acetate followed by a simple cleanup step known as dispersive solid-phase extraction. The aliquot was determined and confirmed by GC-NCI/MS using external standard method. The recoveries of all pesticides were between 70% and 130% at the three spiked levels, 10 microg/kg, 20 microg/kg and 40 microg/kg. The relative standard deviations were less than 13.9%. The linearity of method was good from 50 to 1 000 microg/L. The limits of quantification (LOQ) were less than 8 microg/kg. The method is selective with no interference and is suitable for the confirmatory of pesticide residues in beans and corn.
Shen
Weijian
W
Laboratory of Food, Jiangsu Entry-Exit Inspection and Quarantine Bureau, Nanjing 210001, China. swj9722418@yahoo.com.cn
Gui
Qianwen
Q
Yu
Keyao
K
Sun
Ningning
N
Zhao
Zengyun
Z
Shen
Chongyu
C
Wu
Bin
B
Jiang
Yuan
Y
Chu
Xiaogang
X
D001393:Azoles / Q000032:analysis; D007887:Fabaceae / Q000737:chemistry*; D005506:Food Contamination / Q000032:analysis*; D005659:Fungicides, Industrial / Q000032:analysis*; D008401:Gas Chromatography-Mass Spectrometry; D010573:Pesticide Residues / Q000032:analysis*; D052616:Solid Phase Extraction; D003313:Zea mays / Q000737:chemistry*
D001393:Azoles; D005659:Fungicides, Industrial; D010573:Pesticide Residues