Determination of neonicotinoid insecticide residues in edible oils by water-induced homogeneous liquid–liquid extraction and dispersive liquid–liquid extraction followed by high performance liquid chromatography-diode array detection

RSC Advances ◽  
2015 ◽  
Vol 5 (95) ◽  
pp. 77501-77507 ◽  
Author(s):  
Mir Ali Farajzadeh ◽  
Mohammad Reza Afshar Mogaddam ◽  
Ali Akbar Alizadeh
Keyword(s):  
High Performance ◽  
Edible Oils ◽  
Liquid Extraction ◽  
Homogeneous Liquid ◽  
Liquid Liquid Extraction ◽  
Neonicotinoid Insecticide ◽  
Array Detection ◽  
Dispersive Liquid Liquid Microextraction ◽  
Liquid Microextraction

Development of a new version of homogeneous liquid–liquid extraction based on water induced followed by dispersive liquid–liquid microextraction for extraction of neonicotinoid insecticides from oil samples.

Combination of Counter Current Salting-Out Homogenous Liquid–Liquid Extraction with Dispersive Liquid–Liquid Microextraction for the High-Performance Liquid Chromatographic Determination of Environmental Estrogens in Water Samples

2019 ◽  
Vol 58 (2) ◽  
pp. 171-177 ◽  
Author(s):  
Zhihong Shi ◽  
Qingru Huai ◽  
Xinye Li ◽  
Hongyu Ma ◽  
Can Zhou ◽  
...  
Keyword(s):  
Water Samples ◽  
High Performance ◽  
Liquid Extraction ◽  
Environmental Estrogens ◽  
Salting Out ◽  
Liquid Liquid Extraction ◽  
Dispersive Liquid Liquid Microextraction ◽  
Counter Current ◽  
Liquid Microextraction

Abstract In this paper, counter current salting-out homogenous liquid–liquid extraction was combined with dispersive liquid–liquid microextraction for the determination of environmental estrogens in water samples by high-performance liquid chromatography. In this method, initially, sodium chloride was filled into a syringe and a mixture of water sample and acetonitrile was driven to pass through the syringe. Due to salting-out effect, fine droplets of acetonitrile went up through the remaining mixture and aggregated as a separated layer on the top. Then, the collected organic phase (acetonitrile) was removed with a syringe and mixed with carbon tetrachloride (extraction solvent). In the second step, the mixed organic phase was rapidly injected into 5 mL of distilled water to further enrich the analytes. Good linearity was obtained in the concentration range of 2.0~200 ng/mL for diethylstilbestrol (DES) and 8.0~200 ng/mL for octylphenol (OP), respectively. Limits of detection were 0.09 ng/mL for DES and 0.20 ng/mL for OP, respectively. Relative standard deviations for intra- and inter-day precisions were less than 2.1 and 3.1%, respectively. Finally, the established method was successfully applied to determine DES and OP in river water, well water, bottled water and campus drinking water samples with recoveries in the range from 81.0 to 105.9%.

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