Ionic liquid-based dispersive liquid–liquid microextraction followed high-performance liquid chromatography for the determination of organophosphorus pesticides in water sample

He, Lijun; Luo, Xianli; Xie, Hao; Wang, Chunjian; Jiang, Xiuming; Lü, Kui

doi:10.1016/j.aca.2009.09.044

Cited by 205 publications

(86 citation statements)

References 38 publications

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“…33 In this regard, a set of similar experiments were conducted and the effect of centrifugal time was studied in the range of 2-10 min under the centrifugal speed of 5000 rpm. As shown in Figure 7a, the extraction recoveries of the three analytes increase when the centrifugal time increases to 5 min, and decrease slightly after that.…”

Section: Effect Of Centrifugal Timementioning

confidence: 99%

“…33 In this regard, a set of similar experiments were conducted and the effect of centrifugal time was studied in the range of Vol. 28, No.…”

Section: Effect Of Centrifugal Timementioning

confidence: 99%

“…However, the addition of salt had different effects when ionic liquids were used as the extraction solvent. [33][34][35] To study the salt addition, various experiments by adding different NaCl concentrations (0.0-1.0 mol L -1 ) were performed. The volume of extraction phase was decreased by the addition of salt due to the increase in the solubility of the ionic liquid in water.…”

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confidence: 99%

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Determination of Traces of Ni, Cu, and Zn in Wastewater and Alloy Samples by Flame-AAS after Ionic Liquid-Based Dispersive Liquid Phase Microextraction

Zare-Shahabadi

Asaadi

Abbasitabar

et al. 2016

J. Braz. Chem. Soc.

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A procedure has been developed for simultaneous separation/preconcentration of copper, nickel, and zinc based on in situ ionic liquid-based dispersive liquid-liquid microextraction method as a prior step to their determination by flame atomic absorption spectrometry. The analytes reacted with sodium diethyl dithiocarbamate at pH 7 to form hydrophobic chelates, which were separated and preconcentrated in the ionic liquid phase. The method is fast, simple, accurate, and environmentally friendly. The parameters affecting the extraction efficiency of the proposed method such as the pH of sample solution, centrifugation time, type and volume of the dispersive solvent, and the salt effect were studied. Enrichment factors of 61.8, 61.2, and 40.0 and detection limits of 0.79, 0.93, and 0.71 µg L -1 were obtained for copper, nickel, and zinc, respectively. The relative standard deviations based on six replicate measurements were between 1.0 and 2.7%. The method was successfully applied to the extraction and determination of these metals in wastewater and alloy samples.Keywords: dispersive liquid-liquid microextraction, nickel, zinc, copper, ionic liquid, sodium diethyl dithiocarbamate IntroductionIn the priority list of Agency for Toxic Substances and Disease Registry (ATSDR), Ni is at rank 57, Zn at 75, and Cu at 118.1 Nickel is essential for many biological activities such as activation of some enzymes and enhancement of insulin activity. 2 Copper plays important roles in metabolism, including antioxidant effects, energy generation and incorporation of Fe into hemoglobin.3 Zinc also has an important role in various biological systems, such as gene expression, protein-protein interaction, and neurotransmission. 4 Although nickel, copper, and zinc come into the category of essential trace elements, when they are taken at high levels, they can also produce toxic effects. 5-8Thus, determination and monitoring of these toxic metals in industrial effluent, biological samples and food stuff are of prime concern.The trace elements level in samples to be analyzed are sometimes lower than the detection limit of analytical instruments such as flame atomic absorption spectroscopy (FAAS), inductively coupled plasma optical emission spectrometry (ICP OES) and graphite furnace-atomic absorption spectrometry (GF-AAS).9,10 Therefore, a suitable sample pretreatment step is a required step prior to the analysis. Several techniques including solid phase extraction, 11,12 liquid-liquid extraction, [13][14][15][16] cloud point extraction, 17-19 and co-precipitation 20,21 have been employed to solve this issue. Most of these techniques suffer from limitations that limit their application. Some examples of these limitations include significant chemical additives, solvent losses, large secondary wastes, unsatisfactory enrichment factors, complex equipment, and high time consumption.Dispersive liquid-liquid microextraction (DLLME) overcomes some of the drawbacks of old sample preparation techniques. [22][23][24] It is simple, fast, and does n...

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Section: Effect Of Centrifugal Timementioning

confidence: 99%

“…33 In this regard, a set of similar experiments were conducted and the effect of centrifugal time was studied in the range of Vol. 28, No.…”

Section: Effect Of Centrifugal Timementioning

confidence: 99%

mentioning

confidence: 99%

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Determination of Traces of Ni, Cu, and Zn in Wastewater and Alloy Samples by Flame-AAS after Ionic Liquid-Based Dispersive Liquid Phase Microextraction

Zare-Shahabadi

Asaadi

Abbasitabar

et al. 2016

J. Braz. Chem. Soc.

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“…The selection of IL depended on the good performance of the disperser solvent. He et al [74] proposed a new technique of preconcentration of OPPs (parathion, phoxim, phorate and chlorpyifos) from water samples by using DLLME with 1-octyl-3-methylimidazolium hexafluorophosphate ([C 8 6 ] dispersed entire into sample solution with the help of disperser solvent (methanol). After centrifugation, the sediment phase was withdrawn using a microsyringe and then injected into HPLC Fig.…”

Section: Conventional Il-dllmementioning

confidence: 99%

Recent Advances in Dispersive Liquid - Liquid Microextraction for Organic Compounds Analysis in Environmental Water: A Review

Ma¹,

Lü²,

Chen

2012

CAC

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Dispersive liquid-liquid microextraction (DLLME) is a novel microextraction technique with a great potential in sample pretreatment, which has been increasingly used for preconcentration of diverse analytes. This review updates the state of the art and discusses promising prospects of DLLME, especially focuses on its combined use with chromatographic techniques for organic compounds analysis in environmental water samples. General and specific concepts of the fundamental theory of DLLME are described, and examples of recent innovations and applications are provided to demonstrate its potential for the determination of a wide range of organic compounds in various water matrices. Moreover, some limitations related to DLLME are also discussed in detail, and an outlook on the future of the technique, specifically its coupling with other pretreatment approaches, separation and detection techniques, is also given.

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“…Besides, it can achieve selective extraction and reduce matrix interfereence through the adjustment of solvent extraction of polarity or acidity and alkalinity [21]. Owing to above unique advantages, DLLME has been applied to the analyses of polycyclic aromatic hydrocarbons [22], organophosphorus pesticides [23], herbicides [24], cadmium [25] and cobalt [20,26] in water samples, cholesterol [27], amitraz [28] and cobalt [20] in food samples, psychotropic drugs [29], emodin and its metabolites [30] in urine samples. But so far, the method has been rarely applied in the extraction and concentration of active components in complex CMH samples [31], and there is no report that DLLME was used in determination of OA and UA.…”

Section: Introductionmentioning

confidence: 99%

Utilization of Dispersive Liquid-Liquid Microextraction Coupled with HPLC-UV as a Sensitive and Efficient Method for the Extraction and Determination of Oleanolic Acid and Ursolic Acid in Chinese Medicinal Herbs

Hao¹,

Chen²,

Hu³

et al. 2012

AJAC

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Isomeric triterpenic acids of oleanolic acid (OA) and ursolic acid (UA) both have very low ultraviolet absorption and always exist in the same plant, so the separation and simultaneous determination of them have been a difficult task. In this study, a sensitive method combining dispersive liquid-liquid microextraction (DLLME) with HPLC-UV was developed for the extraction and determination of OA and UA in traditional Chinese medicinal herbs (CMHs). Variables influencing DLLME such as type and volume of extraction solvent, volume of dispersive solvent, ionic strength, aqueous phase pH, extraction time, centrifugation speed and time, and sample volume were investigated and optimized. Under the optimum conditions, both OA and UA attained favorable extraction efficiencies with enrichment factors 1378 and 933, respectively. The linear dynamic ranges of 0.07 -30.4 μg·mL -1 for OA and 0.08 -33.6 μg·mL -1 for UA were obtained with square correlation coefficients of 0.9963. The detection limits of OA and UA were both 0.02 μg·mL -1 . The method recoveries ranged between 88.2% -116.2% for OA and 85.7% -108.2% for UA with the RSDs (n = 5) lower than 8.6%. The proposed method was successfully applied to concentrate and simultaneously determine these two triterpenic acids in Hedyotis diffusa and Eriobotrya japonica samples.

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Ionic liquid-based dispersive liquid–liquid microextraction followed high-performance liquid chromatography for the determination of organophosphorus pesticides in water sample

Cited by 205 publications

References 38 publications

Determination of Traces of Ni, Cu, and Zn in Wastewater and Alloy Samples by Flame-AAS after Ionic Liquid-Based Dispersive Liquid Phase Microextraction

Determination of Traces of Ni, Cu, and Zn in Wastewater and Alloy Samples by Flame-AAS after Ionic Liquid-Based Dispersive Liquid Phase Microextraction

Recent Advances in Dispersive Liquid - Liquid Microextraction for Organic Compounds Analysis in Environmental Water: A Review

Utilization of Dispersive Liquid-Liquid Microextraction Coupled with HPLC-UV as a Sensitive and Efficient Method for the Extraction and Determination of Oleanolic Acid and Ursolic Acid in Chinese Medicinal Herbs

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