Determination of Some Organophosphorus and Azole Group Pesticides in Water Samples by Dispersive Liquid–Liquid Microextraction Coupled with GC/MS

2011 ◽  
Vol 94 (6) ◽  
pp. 1882-1890 ◽  
Author(s):  
Abdullah Akdoğan ◽  
Ümit Divrikli ◽  
Andlatif Elçi
Keyword(s):  
Experimental Design ◽  
Water Samples ◽  
Sample Volume ◽  
Aqueous Sample ◽  
Experimental Conditions ◽  
Extraction Solvent ◽  
Pesticides In Water ◽  
Dispersive Liquid Liquid Microextraction ◽  
Liquid Microextraction

Abstract A dispersive liquid–liquid microextraction (DLLME) procedure coupled with GC/MS detection is described for preconcentration and determination of some organophosphorus and azole group pesticides from water samples. Experimental conditions affecting the DLLME procedure were optimized by means of an experimental design. A mixture of 60 μL chlorobenzene (extraction solvent) and 750 μL acetonitrile (disperser solvent), 3.5 min extraction time, and 7.5 mL aqueous sample volume were chosen for the best recovery by DLLME. The linear range was 1.6–32 μg/L. The LOD ranged from 48.8 to 68.7 ng/L. The RSD values for organophosphorus and azole group pesticides at spiking levels of 3, 6, and 9 μg/L in water samples were in the range of 1.1 – 12.8%. The applicability and accuracy of the developed method were determined by analysis of spiked water samples, and the recoveries of the analyzed pesticides from artesian, stream, and tap waters at spiking levels of 3, 6, and 9 μg/L were 89.3–105.6, 89.5–103.0, and 92.0–111.3%, respectively.

scholarly journals Dispersive Liquid-Liquid Microextraction Based on Solidification of Floating Organic Drop Followed by Gas Chromatography-Electron Capture Detector for Determination of Some Pesticides in Water Samples

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
Mostafa Bashiri Juybari ◽  
Ali Mehdinia ◽  
Ali Jabbari ◽  
Yadollah Yamini
Keyword(s):  
Gas Chromatography ◽  
Electron Capture ◽  
Water Samples ◽  
Electron Capture Detection ◽  
Extraction Solvent ◽  
Relative Standard ◽  
Pesticides In Water ◽  
Dispersive Liquid Liquid Microextraction ◽  
Liquid Microextraction

In this study dispersive liquid-liquid microextraction based on solidification of floating organic drop (DLLME-SFO) followed by gas chromatography-electron capture detection (GC-ECD) was developed for determination of some pesticides in the water samples. Some important parameters, such as type and volumes of extraction and disperser solvent and salt effect on the extraction recovery of analytes from aqueous solution were investigated. Under the optimum conditions (extraction solvent: 1-undecanol, 15.0 μL; disperser solvent: acetone, 1.0 mL, and without salt addition), the preconcentration factors were obtained ranged from 802 to 915 for analytes. The linear ranges were from 0.05 to 100 μg L−1, and detection limits ranged from 0.05 to 0.008 μg L−1. The relative standard deviations (RSDs%, ) were between 3.2% and 6.7%. The proposed method was successfully applied to the determination of target analytes in the tap, sea, and river water samples, and satisfactory recoveries were obtained.

scholarly journals Dispersive liquid-liquid microextraction and liquid chromatographic determination of pentachlorophenol in water

2009 ◽  
Vol 7 (3) ◽  
pp. 369-374 ◽  
Author(s):  
Khalil Farhadi ◽  
Mir Farajzadeh ◽  
Amir Matin ◽  
Paria Hashemi
Keyword(s):  
Water Samples ◽  
Dynamic Range ◽  
Chromatographic Determination ◽  
Extraction Solvent ◽  
Wide Linear Dynamic Range ◽  
Liquid Chromatographic Determination ◽  
Dispersive Liquid Liquid Microextraction ◽  
Liquid Chromatographic ◽  
Liquid Microextraction

AbstractA simple and sensitive dispersive liquid-liquid microextraction method for extraction and preconcentration of pentachlorophenol (PCP) in water samples is presented. After adjusting the sample pH to 3, extraction was performed in the presence of 1% W/V sodium chloride by injecting 1 mL acetone as disperser solvent containing 15 μL tetrachloroethylene as extraction solvent. The proposed DLLME method was followed by HPLC-DAD for determination of PCP. It has good linearity (0.994) with wide linear dynamic range (0.1–1000 μg L−1) and low detection limit (0.03 μg L−1), which makes it suitable for determination of PCP in water samples.

scholarly journals Use of Dispersive Liquid-Liquid Microextraction and UV-Vis Spectrophotometry for the Determination of Cadmium in Water Samples

2014 ◽  
Vol 2014 ◽  
pp. 1-4 ◽  
Author(s):  
J. Pérez-Outeiral ◽  
E. Millán ◽  
R. Garcia-Arrona
Keyword(s):  
Water Samples ◽  
Limit Of Detection ◽  
Experimental Conditions ◽  
Cadmium Determination ◽  
A Value ◽  
Relative Standard ◽  
Potential Applicability ◽  
Dispersive Liquid Liquid Microextraction ◽  
Liquid Microextraction

A simple and inexpensive method for cadmium determination in water using dispersive liquid-liquid microextraction and ultraviolet-visible spectrophotometry was developed. In order to obtain the best experimental conditions, experimental design was applied. Calibration was made in the range of 10–100 μg/L, obtaining good linearity (R2 = 0.9947). The obtained limit of detection based on calibration curve was 8.5 μg/L. Intra- and interday repeatability were checked at two levels, obtaining relative standard deviation values from 9.0 to 13.3%. The enrichment factor had a value of 73. Metal interferences were also checked and tolerable limits were evaluated. Finally, the method was applied to cadmium determination in real spiked water samples. Therefore, the method showed potential applicability for cadmium determination in highly contaminated liquid samples.

Simultaneous determination of cationic dyes in water samples with dispersive liquid–liquid microextraction followed by spectrophotometry: experimental design methodology

2016 ◽  
Vol 40 (5) ◽  
pp. 4793-4802 ◽  
Author(s):  
Arash Asfaram ◽  
Mehrorang Ghaedi
Keyword(s):  
Experimental Design ◽  
Simultaneous Determination ◽  
Water Samples ◽  
Design Methodology ◽  
Cationic Dyes ◽  
Dispersive Liquid Liquid Microextraction ◽  
Experimental Design Methodology ◽  
Liquid Microextraction

Dispersive liquid–liquid microextraction (DLLME) combined with spectrophotometry was applied to the determination of two dyes in water samples.

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