Homogeneous liquid–liquid extraction combined with gas chromatography–electron capture detector for the determination of three pesticide residues in soils

2008 ◽  
Vol 620 (1-2) ◽  
pp. 162-169 ◽  
Author(s):  
Xuedong Wang ◽  
Xinna Zhao ◽  
Xiujuan Liu ◽  
Yanyan Li ◽  
Lingyan Fu ◽  
...  
Keyword(s):  
Gas Chromatography ◽  
Electron Capture ◽  
Pesticide Residues ◽  
Liquid Extraction ◽  
Electron Capture Detector ◽  
Homogeneous Liquid ◽  
Liquid Liquid Extraction

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).

Determination of Bromate Ions in Drinking Water by Derivatization with 2-Methyl-2-Butene, Dispersive Liquid-Liquid Extraction and Gas Chromatography-Electron Capture Detection

2020 ◽  
Vol 103 (5) ◽  
pp. 1243-1249
Author(s):  
Mehdi Nabi ◽  
Sayed Mehdi Ghoreishi ◽  
Mohsen Behpour
Keyword(s):  
Gas Chromatography ◽  
Detection Limit ◽  
Electron Capture ◽  
Liquid Extraction ◽  
International Standards ◽  
Electron Capture Detection ◽  
Liquid Liquid Extraction ◽  
Relative Standard ◽  
Derivatizing Agent

Abstract Background A simple, rapid, selective and sensitive sample preparation and derivatization method was performed for determination of bromate ions in water by means of dispersive liquid-liquid extraction (DLLE) by gas chromatography-electron capture detection (GC-ECD). This method is based on 2-methyl-2-butene derivatization by bromine produced from bromate ions in acidic medium and extraction by n-hexane. Objective Derivatizing agent: It is cheap and available and it has high efficiency in reaction with Br2. Simplicity: Preparation and extraction process don't need to any specific equipment and procedure is completely simple and fast. Limit of detection: DL is as low as 0.43 µg/L. Methods Various effective factors on the derivatization and extraction efficiency, such as amount of derivatizing agent, volume of extraction solvent, bromide concentration, volume and concentration of sulfuric acid, type and volume of extracting and dispersing solvent, ionic strength, storage time before extraction and ECD makeup-gas flow rate were investigated. Results Under the optimum conditions, the method had a linear calibration curve ranging from 1.0 to 200.0 µg/L for bromate ions with a determination coefficient (R2) of 0.994 and the detection limit was 0.43 µg/L. The recovery percent and relative standard deviation for the determination of 1.0, 5.0 and 50.0 µg/L bromate ion was between 90 and 110%, and 3.0 and 8.0% (n = 3), respectively. Conclusions Finally, the method was successfully applied for the preconcentration and determination of bromate ions in water samples, and satisfactory results were obtained. Highlights (1) Fast, easy, accurate and economical innovative analysis of bromate ions in water and wastewater. (2) Determination of inorganic ion by GC-ECD after derivatization (3) Low detection limit (4) Optimization of different method parameters to obtain accurate results based on requirements of international standards, specifically ISO/IEC 17025.

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