Simultaneous Determination of Four Plant Hormones in Soil by Ultrasound-Assisted Ionic Liquid Based Dispersive Liquid-Liquid Microextraction

2014 ◽  
Vol 675-677 ◽  
pp. 181-184 ◽  
Author(s):  
Gui Qi Huang ◽  
She Ying Dong ◽  
Zhen Yang ◽  
Ting Lin Huang
Keyword(s):  
Ionic Liquid ◽  
Plant Hormones ◽  
High Performance ◽  
Extraction Solvent ◽  
Target Analytes ◽  
Relative Standard ◽  
Ultrasound Assisted ◽  
Dispersive Liquid Liquid Microextraction ◽  
Liquid Microextraction

An ultrasound-assisted ionic liquid based dispersive liquid-liquid microextraction (UA-IL-DLLME) was developed for the determination of four plant hormones (6-benzyladenine (6-BA), kinetin (6-KT), 2, 4-dichlorophenoxy acetic acid (2, 4-D) and uniconazole (UN)) in soil, using high performance liquid chromatography (HPLC)-diode array detection (DAD). Several important parameters including the type and volume of extraction solvent, the volume of disperser solvent, ultrasound time, pH of the solution and salt effect were studied and optimized. Under optimum conditions, the limits of detections (LODs) for the target analytes were in the range of 0.002-0.01 μg g-1. And satisfactory recoveries of the target analytes in the soil samples were 79.3-96.7 %, with relative standard deviations (RSD, n=5) that ranged from 4.3 to 6.7%.

Ultra-trace Extraction of Two Bactericides Via Ultrasound-Assisted Dispersive Liquid-Liquid Microextraction

2020 ◽  
Author(s):  
Xun Gao ◽  
Xinxin Si ◽  
Yunxia Yuan ◽  
Kexin Chen ◽  
Kunming Qin
Keyword(s):  
High Performance ◽  
Optimum Conditions ◽  
Accuracy And Precision ◽  
Relative Standard ◽  
Liquid Chromatography Tandem Mass ◽  
Ultrasound Assisted ◽  
Ultra Trace ◽  
Dispersive Liquid Liquid Microextraction ◽  
Liquid Microextraction

Abstract Background A simple, rapid and sensitive method coupling ultrasound-assisted dispersive liquid-liquid microextraction (DLLME) with ultra-high performance liquid chromatography-tandem mass spectrometry was developed for the simultaneous determination of malachite green (MG) and crystal violet (CV) in different water samples. Objective In ultrasound-assisted DLLME procedure, several parameters affecting the extraction efficiency, including pH, type and volume of the extraction and dispersive solvents, extraction time, ionic strength, were optimized to improve the accuracy and precision of this method. Methods MG and CV were extracted and preconcentrated using dichloromethane and acetonitrile as the extraction and dispersive solvents, respectively. Results Under the optimum conditions, the proposed method affords good linearity in the range of 0.40–20.0 ng/L, and the limit of detections were 0.21 and 0.32 ng/L for MG and CV, respectively. The recoveries of the method at three spiked levels were in the range of 83.4–94.2% with relative standard deviations lower than 4.7% (n = 3). Conclusions Satisfactorily, no significant matrix effect has been found as the data ranged between 68% and 102%.

Rational design of an ionic liquid dispersive liquid–liquid micro-extraction method for the detection of organophosphorus pesticides

The Analyst ◽  
2019 ◽  
Vol 144 (6) ◽  
pp. 2166-2172 ◽  
Author(s):  
Dingkun Lu ◽  
Chang Liu ◽  
Jingjing Deng ◽  
Xinguang Zhou ◽  
Guoyue Shi ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Extraction Method ◽  
High Performance ◽  
Rational Design ◽  
Organophosphorus Pesticides ◽  
Extraction Solvent ◽  
Sensitive Determination ◽  
Dispersive Liquid Liquid Microextraction ◽  
Liquid Microextraction

In this study, a functionalized ionic liquid (IL), [MimCH2COOCH3][NTf2] was rationally designed and explored as an extraction solvent in dispersive liquid–liquid microextraction (DLLME) combined with ultra-high performance liquid chromatography (UHPLC) for the sensitive determination of organophosphorus pesticides (OPs).

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