Electromembrane extraction of zwitterionic compounds as acid or base: Comparison of extraction behavior at acidic and basic pHs

Nojavan, Saeed; Pourahadi, Ahmad; Davarani, Saied Saeed Hosseiny; Najarian, Amin Morteza; Abbassi, Mojtaba Beigzadeh

doi:10.1016/j.aca.2012.07.044

Cited by 29 publications

(14 citation statements)

References 29 publications

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“…The obtained results showed that aliphatic alcohols were suitable organic solvents (as SLM) for the extraction of inorganic anions as also demonstrated in earlier works . Also, it was mentioned that acidic compounds were extracted using aliphatic alcohols (especially with 1‐octanol) . Thus, all of these results verify that aliphatic alcohols can be applied as the SLM solvents for the extraction of compounds (organic or inorganic) with negative charge/charges.…”

Section: Resultssupporting

confidence: 80%

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Electro‐driven extraction of inorganic anions from water samples and water miscible organic solvents and analysis by ion chromatography

et al. 2014

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A simple electromembrane extraction (EME) procedure combined with ion chromatography (IC) was developed to quantify inorganic anions in different pure water samples and water miscible organic solvents. The parameters affecting extraction performance, such as supported liquid membrane (SLM) solvent, extraction time, pH of donor and acceptor solutions, and extraction voltage were optimized. The optimized EME conditions were as follows: 1-heptanol was used as the SLM solvent, the extraction time was 10 min, pHs of the acceptor and donor solutions were 10 and 7, respectively, and the extraction voltage was 15 V. The mobile phase used for IC was a combination of 1.8 mM sodium carbonate and 1.7 mM sodium bicarbonate. Under these optimized conditions, all anions had enrichment factors ranging from 67 to 117 with RSDs between 7.3 and 13.5% (n = 5). Good linearity values ranging from 2 to 1200 ng/mL with coefficients of determination (R(2) ) between 0.987 and 0.999 were obtained. The LODs of the EME-IC method ranged from 0.6 to 7.5 ng/mL. The developed method was applied to different samples to evaluate the feasibility of the method for real applications.

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Section: Resultssupporting

confidence: 80%

“…In the EME procedure, the pH in both sides of the SLM must be adjusted to the optimized values in order to ensure sufficient ionization of the analytes in the sample and acceptor solutions . However, inorganic anions are most often in anionic form across the whole range of pH values.…”

Section: Resultsmentioning

confidence: 99%

Electro‐driven extraction of inorganic anions from water samples and water miscible organic solvents and analysis by ion chromatography

et al. 2014

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“…The equipment used for the EME procedure was the same as that described in previous work . Platinum wires with a diameter of 0.25 mm were used as electrodes in the donor and acceptor solutions, and were connected to the power supply.…”

Section: Methodsmentioning

confidence: 99%

Electrically enhanced liquid‐phase microextraction of three textile azo dyes from wastewater and plant samples

Nojavan

Tahmasebi

Bidarmanesh

et al. 2013

J of Separation Science

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An electromembrane extraction procedure coupled with HPLC and visible detection was applied for the extraction of three textile azo dyes as organic salts. The extraction parameters such as extraction time, applied voltage, pH range, and concentration of salt added were optimized. A driving force of 60 V was applied to extract the analytes through 2-nitrophenyl octyl ether, used as the supported liquid membrane, into a neutral aqueous solution. This method required 20 min extraction time from a neutral sample solution. The proposed microextraction technique provided good linearity with correlation coefficients from 0.996 to 0.998 over a concentration range of 1.0-1000.0 ng/mL. The LODs of dyes were 0.30-0.75 ng/mL, while the reproducibility ranged from 6.7 to 12.9% (n = 6). Also, enrichment factors of 96-162 that corresponded to the recoveries ranging from 48 to 81% were achieved. Finally, the application of this new method was demonstrated on wastewater samples and some plants grown in contaminated environments. Excellent selectivity was obtained as no interfering peaks were detected.

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“…Also, the pH values of sample and acceptor solutions determine the ion balance (defined as the ratio of the sum of ions in the donor solution divided by the sum of ions in the acceptor solution) across the system. It has been shown that ion balance impresses the flux through the membrane, so that the flux may decrease by increasing this ratio, as described by the corresponding theoretical model .…”

Section: Introductionmentioning

confidence: 98%

Electromembrane extraction using two separate cells: A new design for simultaneous extraction of acidic and basic compounds

Nojavan

Asadi

2015

Electrophoresis

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Simultaneous extraction of acidic and basic analytes from a sample is seen to be a challenging task. In this work, a novel and efficient electromembrane extraction (EME) method based on two separate cells was applied to simultaneously extract and preconcentrate two acidic drugs (naproxen and ibuprofen) along with a basic drug (ketamine). Once both cells were filled with the sample solution, basic drug was extracted from one cell with the other cell used to extract acidic drugs. The employed supported liquid membranes for the extraction of acidic and basic drugs were 2-ethyl hexanol and 1-octanol, respectively. Under an applied potential of 250 V in the course of the extraction process, acidic, and basic drugs were extracted from a 3.0 mL aqueous sample solution into 25 μL acceptor solutions. The pH values of the donor and acceptor solutions in the cathodic cell were 5.0 and 1.5, respectively, the corresponding values in the anodic cell were, however, 8.0 and 12.5, respectively. The rates of recovery obtained within 20 min of extraction time at a stirring rate of 750 rpm ranged from 45 to 54%. With correlation coefficients ranging from 0.990 to 0.996, the proposed EME technique provided good linearity over a concentration range of 20-1000 ng/mL. The LOD for all drugs was found to be 6.7 ng/mL, while reproducibility ranged from 7 to 12% (n = 5). Finally, applying the proposed method to determine and quantify the drugs in urine and wastewater samples, satisfactory results were achieved.

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Electromembrane extraction of zwitterionic compounds as acid or base: Comparison of extraction behavior at acidic and basic pHs

Cited by 29 publications

References 29 publications

Electro‐driven extraction of inorganic anions from water samples and water miscible organic solvents and analysis by ion chromatography

Electro‐driven extraction of inorganic anions from water samples and water miscible organic solvents and analysis by ion chromatography

Electrically enhanced liquid‐phase microextraction of three textile azo dyes from wastewater and plant samples

Electromembrane extraction using two separate cells: A new design for simultaneous extraction of acidic and basic compounds

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