Determination of Organochlorine Pesticides by Headspace Liquid Phase Microextraction Using Ionic Liquid Material

2013 ◽  
Vol 675 ◽  
pp. 256-259
Author(s):  
Du Shu Huang ◽  
Ping Yi ◽  
Yun Hui Long ◽  
Yan Jiang ◽  
Qing Shan Pan ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Liquid Phase ◽  
Organochlorine Pesticides ◽  
Room Temperature ◽  
Salt Content ◽  
Sample Volume ◽  
Liquid Phase Microextraction ◽  
Operation Temperature ◽  
Liquid Material

Headspace liquid-phase microextraction with room temperature ionic liquid material, 1-butyl-3-methylimidazolium hexafluorophosphate ([C4MIM][PF6]) as extractant for the determination of organochlorine pesticides including 2,4 '-DDT and 4,4'-DDT from water were investigated in this study. The factors such as salt content, sample pH, operation temperature, stirring rate, extraction time, microdrop volume, and sample volume were found to have significant influence on this process. Results show that the satisfactory extraction conditions were as follows: 30% NaCl (w/v), 800 rpm, 30 min, 60 °C, and 10μL ionic liquid.

Determination of Organochlorine Pesticides in Water Samples through Hollow Fiber Membrane-Liquid Phase Microextraction Using Ionic Liquid Material as Extractant

2013 ◽  
Vol 675 ◽  
pp. 260-263 ◽  
Author(s):  
Du Shu Huang ◽  
Ya Shun Chen ◽  
He Ping Yan ◽  
Na Wu ◽  
Wei Liu ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Liquid Phase ◽  
Organochlorine Pesticides ◽  
Hollow Fiber ◽  
Water Samples ◽  
Hollow Fiber Membrane ◽  
Fiber Membrane ◽  
Liquid Phase Microextraction ◽  
Liquid Material

A novel method for determination of organochlorine pesticides residuals (2,4-DDT and 4,4-DDT) in water samples through hollow fiber membrane-liquid phase microextraction using ionic liquid material as extractant coupled with high performance liquid chromatography has been developed. The effect of extraction parameters including pH of the feed solution, stirring rate and extraction time was investigated. The proposed method provided enrichment efficiency of 323 and 289 for 2,4-DDT and 4,4-DDT respectively. The method had good linear range of 0.5-50 μg /L and the limits of detection of the pesticides were 0.1 μg /L.

A highly selective colorimetric assay for the determination of creatinine in biological samples using gluconic acid capped silver nanoparticles after ionic liquid based dispersive liquid phase microextraction

2021 ◽  
pp. 1-8
Author(s):  
Susan Sadeghi ◽  
Mohadeseh Hosseinpour-Zaryabi
Keyword(s):  
Silver Nanoparticles ◽  
Ionic Liquid ◽  
Liquid Phase ◽  
Human Serum ◽  
Gluconic Acid ◽  
Ag Nps ◽  
Liquid Phase Microextraction ◽  
Relative Standard ◽  
Serum And Urine

A dispersive liquid-phase microextraction method combined with UV–vis spectrophotometry was utilized to highly selective determination of creatinine in human serum and urine samples. To overcome the interferences in complex matrices, creatinine reacted with 1,4-naphthoquinone-2- potassium sulfonate reagent to produce a red coloured product that could be extracted into a small volume of 1-hexyl-3-methylimidazolium hexafluorophosphate ([HMIM]PF6) ionic liquid solvent. To increase the sensitivity of the assay, gluconic acid capped silver nanoparticles (Ag NPs) were used. On addition of Ag NPs to the red coloured extracted product, the solution turned to blue accompanied with a red shift in wavelength around 620 nm that could be detected by the naked eye. The effective variables on the determination of creatinine such as concentration of the reagent, amount of formic and hydrochloric acids, type and volume of the extractant, and concentration of Ag NPs were investigated. Under the optimal conditions, the calibration plot was bimodal with linear ranges from 0.1 to 1.5 µg mL−1 and 1.5 to 105 µg mL−1 creatinine with a limit of detection 0.1 µg mL−1. The relative standard deviation for five measurements at 35 µg mL−1 concentration level was 3.8%. The newly developed assay was used for the determination of creatinine in human serum and urine specimens with satisfactory results.

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