Validation of QuEChERS method for the determination of 36 pesticide residues in fruits and vegetables from Ghana, using gas chromatography with electron capture and pulsed flame photometric detectors

2015 ◽  
Vol 50 (8) ◽  
pp. 560-570 ◽  
Author(s):  
Augustine Donkor ◽  
Paul Osei-Fosu ◽  
Stephen Nyarko ◽  
Robert Kingsford-Adaboh ◽  
Brajesh Dubey ◽  
...  
Keyword(s):  
Gas Chromatography ◽  
Electron Capture ◽  
Pesticide Residues ◽  
Fruits And Vegetables ◽  
Quechers Method

DEVELOPMENT OF ANALYTICAL METHOD FOR DETERMINATION OF DITHIOCARBAMATE RESIDUES, EXPRESSED AS CS2 IN FRUITS AND VEGETABLES BY GC-ECD

2021 ◽  
Vol 36 (06) ◽  
Author(s):  
NGOC VINH NGUYEN ◽  
THE TAN LE
Keyword(s):  
Gas Chromatography ◽  
Electron Capture ◽  
Analytical Method ◽  
Pesticide Residues ◽  
Fruits And Vegetables ◽  
Electron Capture Detector ◽  
Research Results ◽  
Vegetable Samples

This report presents the development of analytical method for determination of dithiocarbamat fungicides (DTCs) residues in vegetables through CS2 using gas chromatography with electron capture detector (GC-ECD). Research results show that the method recovery ranges from 84.9 – 98.7% and meets the requirement for pesticide residues analyzing. This method has also been applied for analyzing 12 vegetable samples collected in Tan Dinh and Thi Nghe markets. The results showed that the majority of DTCs levels of these samples are lower LOD value except sample BC2 (0.08 mg/g) and sample X3 (0.11 mg/g).

Comparison of Laboratory Techniques for the Determination of Pesticide Residues in Milk

1963 ◽  
Vol 46 (2) ◽  
pp. 209-215
Author(s):  
J Lloyd Henderson
Keyword(s):  
Gas Chromatography ◽  
Electron Capture ◽  
Pesticide Residues ◽  
Colorimetric Method ◽  
Laboratory Techniques ◽  
Test Electron ◽  
Chloride Determination ◽  
Low Levels ◽  
Organic Chloride

Abstract Of the techniques available for specific pesticide residues, fly bioassay is non-specific and not very sensitive; total organic chloride determination also lacks specificity; the AOAC colorimetric method produces variable results, lacks sensitivity for low levels of residues, and does not cover the range of residues likely to be present in milk. Chromatographic tests are most satisfactory. Microcoulometric gas chromatography has many advantages but requires a skilled analyst. Electron-capture gas chromatography is promising but has not been fully developed. The Mills test, which combines column cleanup with identification by paper chromatography, is a rapid, practical screening test. In a collaborative comparison of the chromatographic procedures, microcoulometry tended to give higher results than the Mills test; electron-capture gave lower results than the other two methods. Details of all tests must be followed closely for good results.

Determination of Chlorinated Pesticide Residues in Wheat by Electron Capture Gas Chromatography

1966 ◽  
Vol 49 (4) ◽  
pp. 768-772
Author(s):  
J G Saha
Keyword(s):  
Gas Chromatography ◽  
Petroleum Ether ◽  
Electron Capture ◽  
Pesticide Residues ◽  
Soxhlet Extraction ◽  
Cleanup Procedure ◽  
Ground Wheat

Abstract Electron capture gas chromatography has been used to measure the efficiency of an extraction and cleanup procedure for chlorinated pesticide residues in wheat. Soxhlet extraction of ground wheat with acetonitrile, followed by partition into petroleum ether and cleanup on a magnesia-Celite column has been found adequate for the determination of heptachlor, aldrin, dieldrin, and endrin in concentrations as low as 5 ppb. Recoveries of aldrin, dieldrin, and endrin ranged from 98 to 104%, while those of heptachlor were 84–92%.

scholarly journals Determination of Organochlorine, Organophosphorus, and Triazine Pesticide Residues in Wine by Gas Chromatography with Electron Capture and Nitrogen–Phosphorus Detection

1996 ◽  
Vol 79 (6) ◽  
pp. 1423-1427 ◽  
Author(s):  
Rosario Garcia-Repetto ◽  
Isabel Garrtoo ◽  
Manuel Repetto
Keyword(s):  
Gas Chromatography ◽  
Electron Capture ◽  
Pesticide Residues ◽  
Solid Phase ◽  
Electron Capture Detection ◽  
Gel Chromatography ◽  
Phase Extraction ◽  
Silica Gel Chromatography ◽  
Nitrogen Phosphorus

Abstract A multiresidue analytical method is described for determining 6 pesticides in wine: chlorpyrifos, dimethoate, quinalphos, simazine, tetradifon, and endosulfan. Wine (200 mL) is extracted with dichloromethane (50 mL, 3 times), and the evaporated extracts are purified by silica gel chromatography. Pesticide residues are eluted with n-hexane, n-hexane-benzene (1 + 1), benzene, benzene–acetone (1 + 1), and acetone. Residues are determined by gas chromatography with nitrogen–phosphorus and electron capture detection, using CPSH-5CB, Carbo wax-20M, and CPSH-19CB columns. Recoveries of pesticides added at 0.025 μg/L were 83–97%, with standard deviations of 0.01–0.05%. Detection limits were 0.13–8.9 ng/L, except for simazine (36.7 μg/L). Results are compared with those obtained with a solid-phase extraction (C18) purification and with different eluant series.

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