Comparison of electron capture and electrolytic conductivity detectors for the residue analysis of s-triazine herbicides

1973 ◽  
Vol 21 (1) ◽  
pp. 93-98 ◽  
Author(s):  
Ranajit Purkayastha ◽  
William P. Cochrane
Keyword(s):  
Electron Capture ◽  
Residue Analysis ◽  
Electrolytic Conductivity ◽  
Triazine Herbicides

Residue Analysis of Organophosphorus and Organochlorine Pesticides in Fatty Matrices by Gas Chromatography Coupled with Electron-Capture Detection

2006 ◽  
Vol 61 (5-6) ◽  
pp. 341-346 ◽  
Author(s):  
Jae-Woo Park ◽  
A. M. Abd El-Aty ◽  
Myoung-Heon Lee ◽  
Sung-Ok Song ◽  
Jae-Han Shim
Keyword(s):  
Gas Chromatography ◽  
Electron Capture ◽  
Simple Procedure ◽  
Linear Regression Analysis ◽  
Residue Analysis ◽  
Electron Capture Detection ◽  
Relative Standard ◽  
Wide Range ◽  
Repeatability And Reproducibility

A multiresidue method for the simultaneous determination of 22 organochlorine (OCs) and organophosphorus (Ops) pesticides (including isomers and metabolites), representing a wide range of physicochemical properties, was developed in fatty matrices extracted from meat. Pesticides were extracted from samples with acetonitrile/n-hexane (v :v, 1:1). The analytical screening was performed by gas chromatography coupled with electron-capture detection (ECD). The identification of compounds was based on their retention time and on comparison of the primary and secondary ions. The optimized method was validated by determining accuracy (recovery percentages), precision (repeatability and reproducibility), and sensitivity (detection and quantitation limits) from analyses of samples fortified at 38 to 300 ng/g levels. Correlation coefficients for the 22 extracted pesticide standard curves (linear regression analysis, n = 3) ranged from 0.998 to 1.000. Recovery studies from 2 g samples fortified at 3 levels demonstrated that the GC-ECD method provides 64.4-96.0% recovery for all pesticides except 2,4′-DDE (44.6-50.4%), 4,4′-DDE (51.1-57.5%) and 2,4′-DDT (50.0-51.2%). Both repeatability and reproducibility relative standard deviation values were < 20% for all residues. Detection limits ranged from 0.31 to 1.27 ng/g and quantification limits were between 1.04 and 4.25 ng/g. The proposed analytical method may be used as a simple procedure in routine determinations of OCs and Ops in meat. It can also be applied to the determination of pesticide multi-residues in other animal products such as butter and milk.

scholarly journals Pesticide Residue Analysis of Vegetables by Gas Chromatography with Electron-Capture Detection

2007 ◽  
Vol 90 (1) ◽  
pp. 263-270 ◽  
Author(s):  
José Fenoll ◽  
Pilar Hellín ◽  
Carmen M Martínez ◽  
Pilar Flores
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Electron Capture ◽  
Residue Analysis ◽  
Electron Capture Detection ◽  
Pesticide Residue Analysis ◽  
Selected Ion Monitoring ◽  
Green Pepper ◽  
Relative Standard ◽  
Residue Levels

Abstract A new and original analytical method was developed for the routine analysis of 28 multiclass pesticide residues in vegetables (green pepper, red pepper, and tomato). The extraction was performed with acetone, and the pesticides were partitioned into ethyl acetatecyclohexane (1 + 1, v/v). Residue levels in vegetables were determined by gas chromatography (GC) with electron-capture detection. Residue identities were confirmed by GC coupled with mass spectrometry in the selected ion monitoring mode. The average recoveries in pepper and tomato obtained for all analytes studied were 67.3 and 123.1%, respectively, with relative standard deviation between 1.8 and 7.0%. The detection limit for the pesticides studied varied from 0.1 to 2.6 μg/kg. The proposed method was applied to the analysis of these compounds in vegetables grown in experimental greenhouses.

Assessment of matrix effects in gas chromatography electron capture pesticide-residue analysis

2003 ◽  
Vol 57 (9-10) ◽  
pp. 657-664 ◽  
Author(s):  
M. E. Hernández Torres ◽  
F. J. Egea González ◽  
L. Cuadros-Rodríguez ◽  
E. Almansa López ◽  
J. L. Martínez Vidal
Keyword(s):  
Gas Chromatography ◽  
Electron Capture ◽  
Pesticide Residue ◽  
Matrix Effects ◽  
Residue Analysis ◽  
Pesticide Residue Analysis
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