Liquid membranes for quantification and speciation of trace metals in natural waters

López-López, José A.; Mendiguchı́a, Carolina; Pinto, Juan J.; Moreno, Carlos

doi:10.1016/j.trac.2010.01.007

Cited by 57 publications

(22 citation statements)

References 58 publications

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“…The main types of mechanisms that describe the transport through liquid membranes are: simple transport, facilitated transport and active transport (Kislik, 2009;Noble and Stern, 1995;Lopez-Lopez at al., 2010).…”

Section: Transport Mechanisms For Bulk Liquid Membranesmentioning

confidence: 99%

Analytical Applications of Transport Through Bulk Liquid Membranes

Diaconu

Ruse

Aboul‐Enein

et al. 2015

Critical Reviews in Analytical Chemistry

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This review discusses the results of research in the use of bulk liquid membranes in separation processes and preconcentration for analytical purposes. It includes some theoretical aspects, definitions, types of liquid membranes, and transport mechanism, as well as advantages of using liquid membranes in laboratory studies. These concepts are necessary to understand fundamental principles of liquid membrane transport. Due to the multiple advantages of liquid membranes several studies present analytical applications of the transport through liquid membranes in separation or preconcentration processes of metallic cations and some organic compounds, such as phenol and phenolic derivatives, organic acids, amino acids, carbohydrates, and drugs. This review presents coupled techniques such as separation through the liquid membrane coupled with flow injection analysis.

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Section: Transport Mechanisms For Bulk Liquid Membranesmentioning

confidence: 99%

Analytical Applications of Transport Through Bulk Liquid Membranes

Diaconu

Ruse

Aboul‐Enein

et al. 2015

Critical Reviews in Analytical Chemistry

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“…In the last decades, and based on coupled liquid extraction/re-extraction methods, liquid membranes have appeared as a real alternative to metal separation and speciation in natural waters, since they offer selective transport of different species with an adequate selection of the extracting reagent [11][12][13][14]. In addition, liquid membranes present other advantages such as high preconcentration factors, reduction of matrix effects, and low sample manipulation [15,16].…”

Section: Introductionmentioning

confidence: 99%

A Coupled Extraction/Re-Extraction Method for the Chemical Speciation of Nickel in Natural Waters

2019

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Chemical fractionation and speciation of metals species in natural waters and its relation with bioavailability have received increased attention in recent years. A simple liquid membranes method, based on coupled liquid extraction and re-extraction processes, is proposed to separate and quantify the species of nickel present in water samples. A simplex optimization of chemical variables, such as carrier concentration in the organic solution and nitric acid concentration in the receiving solution, was performed and, under optimized conditions, the extraction system was applied to determine nickel species in water samples at natural level concentrations. A linear relationship was established between extraction efficacy and the concentration of dissolved organic carbon in the samples, allowing the separation and determination of labile and non-labile nickel fractions, since the latter was not transported through the organic solution acting as liquid membrane. When the total and labile concentrations of metals were analyzed in real samples with different salinities, no significant differences were found between the results obtained and those from well-established methods. An average relative error of 1.50 and 2.37 was obtained for total Ni concentration and labile fraction, respectively. Finally, a comparison with the theoretical speciation data calculated with the software WinHumic V was successfully performed. Thus, the proposed method allows the simultaneous determination of labile and non-labile nickel fractions, presented as a simple alternative to nickel fractionation in natural waters.

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“…Nevertheless, recent studies suggest that competitive ligand–stripping voltammetry methods overestimate metal complexation by DOM (Dissolved organic Matter) and therefore underestimate metal concentration in comparison with model predictions (WHAM VII) [ 16 ]. Among others separation methods, solid phase and liquid-liquid extractions have been extensively used, while recently, liquid membranes have been described as a clean, useful and powerful alternative to these classical methods [ 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

Liquid Membranes as a Tool for Chemical Speciation of Metals in Natural Waters: Organic and Inorganic Complexes of Nickel

2018

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The different species of nickel present in natural waters exhibit different transport behaviour through bulk liquid membranes (BLMs). This fact has been used to design and optimise a separation/pre-concentration system applicable to separate labile and non-labile nickel fractions. A hydrazone derivative—1,2-cyclohexanedione bis-benzoyl-hydrazone (1,2-CHBBH) dissolved in toluene/dimethyl formamide (2% DMF)—was used as a chemical carrier of nickel species, from an aqueous source solution (sample) to a receiving acidic solution. Both chemical and hydrodynamic conditions controlling the transport system were studied and optimised. Under optimum conditions, variations in the transport of nickel ions as a function of organic (humic acids) and inorganic (chloride ions) ligands were studied. Relationships between the permeability coefficient (P) or recovery efficiency (%R) and the concentrations of ligands and nickel species were analysed using Winhumic V software. A negative correlation between P and the concentration of organic nickel complexes was found, suggesting that only labile nickel species are transported through the liquid membrane, with non-labile complexes remaining in the water sample; allowing for their separation and subsequent quantification in natural waters.

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Liquid membranes for quantification and speciation of trace metals in natural waters

Cited by 57 publications

References 58 publications

Analytical Applications of Transport Through Bulk Liquid Membranes

Analytical Applications of Transport Through Bulk Liquid Membranes

A Coupled Extraction/Re-Extraction Method for the Chemical Speciation of Nickel in Natural Waters

Liquid Membranes as a Tool for Chemical Speciation of Metals in Natural Waters: Organic and Inorganic Complexes of Nickel

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