Automated system for the trace analysis of organic compounds with supported liquid membranes for sample enrichment

Jönsson, Jan Åke; Mathiasson, Lennart; Lindeg»rd, B.; Trocewicz, Jerzy; Olsson, Anders

doi:10.1016/0021-9673(94)85056-9

Cited by 34 publications

(14 citation statements)

References 14 publications

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“…Membrane-assisted LPME have been performed in two classes of miniaturized SLM extraction systems: (i) flat-sheet SLM in flow systems, demonstrated by Jönsson et al 20 and (ii) hollow fiber SLM in stagnant systems also known as hollow fiber liquid-phase microextraction (HF-LPME), introduced by…”

Section: Introductionmentioning

confidence: 99%

Membrane-Assisted Liquid-Phase Extraction of Lu(III) in a U-Shaped Contactor with a Single Hollow Fiber Membrane

Kumrić

Vladisavljević

Trtić-Petrović

2012

Ind. Eng. Chem. Res.

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Extraction of Lu(III) from an aqueous LuCl 3 solution at pH 3.5 into an organic phase containing 5% (v/v) di(2ethylhexyl)phosphoric acid (DEHPA) in di-n-hexyl ether (DHE) immobilized within a polypropylene hollow fiber membrane and a simultaneous back-extraction of Lu(III) into 2 mol dm −3 HCl solution has been investigated using two miniaturized supported liquid membrane (SLM) systems: (i) a single hollow fiber membrane, with stagnant acceptor phase in the lumen, immersed into a donor phase reservoir; and (ii) a U-shaped module containing a single hollow fiber membrane with a closedloop recirculation of aqueous phases through the module. In the stagnant SLM system, the maximum extraction efficiency was 8.8% due to limited acceptor volume and absence of flow within the lumen. In recirculating SLM system, after 80 min of operation at the donor phase flow rate of 5.3 cm 3 min −1 , the acceptor phase flow rate of 0.4 cm 3 min −1 and the donor-to-acceptor phase volume ratio of 6.7, the equilibrium removal efficiency of Lu(III) reached 88% and less than 5% of Lu(III) extracted from the feed solution was kept in the organic phase. For shell side flow of the donor phase at Reynolds numbers of Re = 3−34, the overall mass-transfer coefficient was proportional to the donor flow rate raised to the power of 0.63 and increased from 2.3 × 10 −5 m s −1 to 8.8 × 10 −5 m s −1 . The rate-limiting step was the mass transfer of Lu(III) within the boundary layer of the donor phase adjacent to the outer wall of the hollow fiber.

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Section: Introductionmentioning

confidence: 99%

Membrane-Assisted Liquid-Phase Extraction of Lu(III) in a U-Shaped Contactor with a Single Hollow Fiber Membrane

Kumrić

Vladisavljević

Trtić-Petrović

2012

Ind. Eng. Chem. Res.

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“…In order to examine the matrix effect in real samples, the environmental water samples were spiked with CPAs/CPs at their lowest concentration in corresponding linear range. As seen in Table 3, the low absolute recoveries were as expected due to its partition equilibrium mechanism of LLLME/AMADP Table 2 Comparison of the present dynamic LLLME with other LPME techniques such as static LLLME, 15 PDLLME 23 and ultrasoundassisted headspace (UAHS) LPME 21 for determining CPAs or CPs in environmental aqueous samples…”

Section: Application Of Dynamic Lllmementioning

confidence: 62%

“…The preliminary results (data not shown) indicated that 1-octanol met most of the requirements and could be used to extract CPAs. A previous publication 21 also demonstrated that a polar extraction solvent was preferred for efficient extraction of polar analytes from aqueous solutions. 1,2,4-TCB was suitable for CPs and 2,4,5-T due to its low polarity and structural similarity.…”

Section: Resultsmentioning

confidence: 92%

Determination of Phenoxyacetic Acids and Chlorophenols in Aqueous Samples by Dynamic Liquid-Liquid-Liquid Microextraction with Ion-Pair Liquid Chromatography

et al. 2011

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“…SLM is quite popular nowadays for drugs assay in biological fluids, e.g. local anaesthetics in human plasma (Shen et al, 1998a, b), automated system for determination of amperozide in plasma (Jönsson et al, 1994). It is also applicable for drugs determination in urine, e.g.…”

Section: Introductionmentioning

confidence: 99%

Investigation of propofol renal elimination by HPLC using supported liquid membrane procedure for sample preparation

Dawidowicz¹,

Kalitynski²,

Trocewicz³

et al. 2002

Biomedical Chromatography

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One of the least explored subjects in the research on the metabolism of a widely used anaesthetic, propofol, is its excretion in an unchanged form. According to literature, the estimated percentage of applied propofol eliminated intact via kidneys is lower than 0.3%. The present study shows the amount of propofol excreted in an unchanged form with urine collected during the first 48 h after anaesthesia in five patients undergoing elective intracranial procedures. The drug was concentrated and selectively isolated from urine samples by supported liquid membrane technique and determined by HPLC with fluorescence detection. The amount of unchanged propofol eliminated with urine was approximately (0.004 +/- 0.002)% of the total applied dose. The obtained results may suggest that propofol in an unchanged form is not excreted by kidneys at all provided that all propofol determined in presented study originated from conjugates hydrolysis.

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Automated system for the trace analysis of organic compounds with supported liquid membranes for sample enrichment

Cited by 34 publications

References 14 publications

Membrane-Assisted Liquid-Phase Extraction of Lu(III) in a U-Shaped Contactor with a Single Hollow Fiber Membrane

Membrane-Assisted Liquid-Phase Extraction of Lu(III) in a U-Shaped Contactor with a Single Hollow Fiber Membrane

Determination of Phenoxyacetic Acids and Chlorophenols in Aqueous Samples by Dynamic Liquid-Liquid-Liquid Microextraction with Ion-Pair Liquid Chromatography

Investigation of propofol renal elimination by HPLC using supported liquid membrane procedure for sample preparation

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