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

Vergel, Cristina; Mendiguchı́a, Carolina; Moreno, Carlos

doi:10.3390/membranes8020019

Cited by 3 publications

(4 citation statements)

References 35 publications

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“…These experimental results are in agreement with the calculated fraction of free Zn(II) (26%), showing that only free Zn(II) ions were transported through the HFSLM system. It is important to remark that Medusa software do not include information about the formation of organic metal complexes with dissolved organic matter and that in a recent publication a decrease in the transport efficiency of Ni(II) in a PLM system was observed when the humic acid concentration increased [34], showing that the presence of dissolved organic matter affects metal transport through the liquid membrane.…”

Section: Resultsmentioning

confidence: 99%

Design of a Hollow Fiber Supported Liquid Membrane System for Zn Speciation in Natural Waters

2018

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A supported liquid membrane-hollow fiber system (HFSLM) has been developed to determine zinc speciation in aquatic environments. The liquid membrane consisted of an organic solution of bis-(2-ethylhexyl)phosphoric acid (D2EHPA) impregnated in the microporous of a polypropylene hollow fiber. The membrane contacted both the donor solution, that contained the metal and the stripping solution, placed in the lumen of the hollow fiber, where the metal was preconcentrated. Different parameters affecting the Zn2+ transport efficiency have been evaluated such as the composition of both the donor and stripping solutions as well as the membrane phase. Extraction and transport efficiencies of free Zn(II) higher than 90% were obtained with a liquid membrane consisting of a 0.1 M D2EHPA solution in dodecane and a 0.1 M HNO3 solution as the stripping phase. The developed HFSLM was used to study the effect of different ligands (EDTA and citric acid) in the donor phase of Zn(II) transport and to investigate the selectivity of the membrane towards Zn when other metals were also present. Finally, the HFSLM system was successfully applied to estimate the free Zn(II) concentrations in three water samples from a mining area. Moreover, the HFSLM system facilitates the analytical determination of trace Zn(II) levels allowing the achievement of enrichment factors of around 700 in the stripping phase.

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Section: Resultsmentioning

confidence: 99%

Design of a Hollow Fiber Supported Liquid Membrane System for Zn Speciation in Natural Waters

2018

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“…to separate cobalt and using that optimum condition extraction of cobalt in competition with nickel has been also studied. Using the bulk liquid membrane (BLM) process, Vergel et al 28 have separated nickel from natural water. They have used 1,2-cyclohexanedione bis-benzoylhydrazone (1,2-CHBBH) as a carrier with toluene/dimethylformamide.…”

Section: Introductionmentioning

confidence: 99%

Separation and Recovery of Nickel and Zinc from Synthetic Wastewater Using Supported Liquid Membranes with in Situ Electrodeposition

Mondal

Beriya

Saha

2019

Ind. Eng. Chem. Res.

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A new type of supported liquid membrane setup has been developed in this work. The setup consist of an in situ electrodeposition unit in strip phase which helps “stripped” nickel and zinc from synthetic wastewater get electrodeposited on the cathode surface. This type of separation technique not only helps to separate toxic heavy metals from wastewater but also yields an useful end product in the form of electroplated material. Two types of carrier, i.e., trioctyl amine and di-(2-ethylhexyl)phosphoric acid, have been used in the organic phase to separate zinc and nickel. The separation has been done individually as well as in a condition of binary pollutant in the feed phase. Various physicochemical parameters have been optimized to maximize the transport and deposition of metals on the cathode surface. Face-centered central composite designs in response to surface methodology have been performed on varied ratios of binary pollutant and their carriers in order to obtain optimum performance of the separation unit.

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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%

“…In liquid membranes-based speciation studies, the labile fraction is related to the fraction capable of crossing the membrane and then, it can be considered the bioavailable fraction [14,26]. Depending on the experimental setup it can include the free ion or the free ion and mobile and labile metal complexes [27].…”

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

Cited by 3 publications

References 35 publications

Design of a Hollow Fiber Supported Liquid Membrane System for Zn Speciation in Natural Waters

Design of a Hollow Fiber Supported Liquid Membrane System for Zn Speciation in Natural Waters

Separation and Recovery of Nickel and Zinc from Synthetic Wastewater Using Supported Liquid Membranes with in Situ Electrodeposition

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

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