Hollow fiber based supported liquid membrane: a novel analytical system for trace metal analysis

Parthasarathy, N.; Pelletier, M; Buffle, Jacques

doi:10.1016/s0003-2670(97)00247-x

Cited by 111 publications

(88 citation statements)

References 27 publications

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“…[29] Permeable liquid membrane (PLM) techniques [30,31] are based on the measurement of metal flux, as generated by transport via a carrier molecule, through a hydrophobic membrane. The latter is sandwiched between a sample solution and a strip of receiving solution that contains a strong chelating agent to allow preconcentration.…”

Section: Speciation Methodsmentioning

confidence: 99%

Metal speciation from stream to open ocean: modelling v. measurement

Tipping¹,

Lofts²,

Stockdale³

2016

Environ. Chem.

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Environmental context. The chemical speciation of metals strongly influences their transport, fate and bioavailability in natural waters. Analytical measurement and modelling both play important roles in understanding speciation, while modelling is also needed for prediction. Here, we analyse a large set of data for fresh waters, estuarine and coastal waters, and open ocean water, to examine how well measurements and modelling predictions agree.Abstract. We compiled a data set of ,2000 published metal speciation measurements made on samples of fresh waters, estuarine and coastal waters, and open ocean waters. For each sample, we applied the chemical speciation model WHAM7 to calculate the equilibrium free metal ion concentrations, [M] (mol L À1 ), amounts of metal bound by dissolved organic matter (DOM), n (mol g À1 ), and their ratio n/[M] (L g À1 ), which is a kind of 'local' partition coefficient. Comparison of the measured and predicted speciation variables for the whole data set showed that agreements are best for fresh waters,

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Section: Speciation Methodsmentioning

confidence: 99%

Metal speciation from stream to open ocean: modelling v. measurement

Tipping¹,

Lofts²,

Stockdale³

2016

Environ. Chem.

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“…In general, the transport of metal ions through SLM is based on one of the three possible mechanisms: proton-drive, aniondrive, and metal ion counter gradient-drive [17]. According Ref.…”

Section: Selection Of the Carrier And Its Concentrationmentioning

confidence: 99%

Ultrasensitive determination of cadmium in seawater by hollow fiber supported liquid membrane extraction coupled with graphite furnace atomic absorption spectrometry

Peng

Liu

et al. 2007

Spectrochimica Acta Part B: Atomic Spectroscopy

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A new procedure, based on hollow fiber supported liquid membrane preconcentration coupled with graphite furnace atomic absorption spectrometry (GFAAS) detection, was developed for the determination of trace Cd in seawater samples. With 1-octanol that contained a mixture of dithizone (carrier) and oleic acid immobilized in the pores of the polypropylene hollow fiber as a liquid membrane, Cd was selectively extracted from water samples into 0.05 M HNO 3 that filled the lumen of the hollow fiber as a stripping solution. The main extraction related parameters were optimized, and the effects of salinity and some coexisting interferants were also evaluated. Under the optimum extraction conditions, an enrichment factor of 387 was obtained for a 100-mL sample solution. In combination with graphite furnace atomic absorption spectrometry, a very low detection limit (0.8 ng L − 1 ) and a relative standard deviation (2.5% at 50 ng L − 1 level) were achieved. Five seawater samples were analyzed by the proposed method without dilution, with detected Cd concentration in the range of 56.4-264.8 ng L − 1 and the relative spiked recoveries over 89%. For comparison, these samples were also analyzed by the Inductively Coupled Plasma Mass Spectrometry (ICP-MS) method after a 10-fold dilution for matrix effect elimination. Statistical analysis with a one-way ANOVA shows no significant differences (at 0.05 level) between the results obtained by the proposed and ICP-MS methods. Additionally, analysis of certified reference materials (GBW (E) 080040) shows good agreement with the certified value. These results indicate that this present method is very sensitive and reliable, and can effectively eliminate complex matrix interferences in seawater samples.

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“…8) and there are very few methods (and no unambiguous one) to compare with CGIME. Hollow fiber based permeation liquid membrane (HF-PLM) coupled to ICP-MS detection was chosen because it is a very sensitive technique which has been shown to measure the free ion concentration with a large number of ligands [7,8]. Measurements with both techniques were performed in the fjord-shore laboratory, on filtered and/or raw, nonacidified samples collected with Go-Flo bottles, at different stations and depths in Gulljmar fjord.…”

Section: Environmental Applicationmentioning

confidence: 99%

“…One of these methods is the permeation liquid membrane (PLM) technique, based on the diffusive transport of the target metal ions, by a complexing carrier, across a hydrophobic liquid membrane, from the sample source phase to a small volume of receiving solution. Under correctly chosen conditions, the free metals in the test solution can be determined from the metal measured in the receiving solution using FAAS, ICP-MS or voltammetry [7,8]. Alternative approaches for the free ion measurement are the Donnan Membrane technique (DMT) [9] and the ion selective electrodes (ISE) with improved sensitivity [10,11].…”

Section: Introductionmentioning

confidence: 99%

Integrated Microanalytical System for Simultaneous Voltammetric Measurements of Free Metal Ion Concentrations in Natural Waters

et al. 2006

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A complexing gel integrated microelectrode (CGIME) for direct measurements of free metal ion concentrations in natural waters has been developed. It is prepared by the successive deposition of microlayers of a chelating resin, an antifouling agarose gel and Hg on a 100-interconnected Ir-based microelectrode array. The trace metals of interest are in a first step accumulated on the chelating resin in proportion to their free ion concentration in solution, then released in acidic solution and detected simultaneously by using square wave anodic stripping voltammetry (SWASV). The reliability of this sensor for the simultaneous measurement of copper, lead and cadmium has been studied by a series of replicate laboratory tests. The proportionality between the voltammetric peak current intensity and the free metal ion concentrations in solution has been demonstrated by using malonate as a model ligand. Finally, the CGIME sensor was applied to the Cu and Pb free concentration measurement in sea water samples and the results compared to the free metal ion concentrations measured using hollow fiber based permeation liquid membrane (HF-PLM) coupled to inductively coupled plasma mass spectrophotometer (ICP-MS). Comparable concentration values were found for both metals with both techniques allowing to validate the CGIME measurements in complex media.

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Hollow fiber based supported liquid membrane: a novel analytical system for trace metal analysis

Cited by 111 publications

References 27 publications

Metal speciation from stream to open ocean: modelling v. measurement

Metal speciation from stream to open ocean: modelling v. measurement

Ultrasensitive determination of cadmium in seawater by hollow fiber supported liquid membrane extraction coupled with graphite furnace atomic absorption spectrometry

Integrated Microanalytical System for Simultaneous Voltammetric Measurements of Free Metal Ion Concentrations in Natural Waters

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