The effect of surfactant micelle media on the copper(II) and camium(II) complex formation with some ligands

Loginova, Lidia P.; Chernysheva, O. S.

doi:10.1016/s0167-7322(00)89018-2

Cited by 7 publications

(7 citation statements)

References 9 publications

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“…The optimisation procedure revealed that 0.4 g l 21 of APDC and 0.15 g l 21 of TX100/TX45 are sufficient for the complete complexation and extraction of uncomplexed copper. Compared to pure aqueous solutions these values are higher due to the presence of CTAB in the solution which possibly neutralises some of the available sites of the complexing agent 35 and increase the CPT, respectively.…”

Section: Resultsmentioning

confidence: 96%

Copper fractionation with dissolved organic matter in natural waters and wastewater—a mixed micelle mediated methodology (cloud point extraction) employing flame atomic absorption spectrometry

et al. 2002

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A cloud point extraction-preconcentration methodology for the speciation analysis of free and organically complexed metal species in natural waters is presented. The method is based on the neutralization of the electrostatic charge of the humate-metal complexes with a positively charged surfactant in a high ionic strength solution environment. The resulting complexes are conveniently solubilized in the micelles of a non-ionic surfactant medium and are thus separated from the bulk aqueous phase. Free metal species are also determined by complexation with a conventional chelating agent under mild conditions. The overall procedure is easy, rapid and allows for a high sample throughput in terms of massive analysis of many samples in the same time period. The method offers substantially low detection limits of 8.5 and 0.9 micrograms l-1 for bound and labile species respectively, with a calibration curve rectilinear in the wide range 40-150 micrograms l-1 for the humate associated and 4-40 micrograms l-1 for the free metal species. The method is free from interferences yielding recoveries in the range 97-102% for various samples of different matrixes.

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Section: Resultsmentioning

confidence: 96%

Copper fractionation with dissolved organic matter in natural waters and wastewater—a mixed micelle mediated methodology (cloud point extraction) employing flame atomic absorption spectrometry

et al. 2002

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“…7, 40 The binding of complex forming cations by an ionic SDS micelles can be described using binding con stants 6 К b corresponding to the equilibrium For Сu 2+ ions in a solution with a SDS concentration of 0.05 mol L -1 , logK b = 2.34±0.03 was found. 6 Since the binding of inorganic cations by SDS micelles is caused by the electrostatic interaction and is not specific, 41 it can be assumed that logK b for the Mg II ions is close to the value obtained for Сu II .…”

Section: Resultsmentioning

confidence: 97%

Acid-base and complexation properties of gem-diphosphonic and gem-diphosphinic acids in aqueous solutions and micellar media of surfactants

et al. 2004

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Acid base and complexation properties of gem disubstituted phosphorus acids, viz., methylenediphosphonic, 1 hydroxyethylidene 1,1 diphosphonic, P,P´ diphenylmethylene diphosphinic, and P,P´ diphenyl 1 hydroxyethylidene 1,1 diphosphinic acids, were studied in aqueous solutions and in the presence of biomimetics (micelles of ionic surfactants). The dissociation constants of the acids and stability constants of complexes with magnesium(II) and copper(II) ions were determined in aqueous solutions and microheterogeneous media contain ing sodium dodecyl sulfate, cetylpyridinium chloride, or cetylpyridinium nitrate (ionic strength 0.1 mol L -1 , temperature 25 °С).

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“…1 It has been established that micelles can cause an acceleration or inhibition of a given reaction relative to the equivalent reaction in aqueous media. These effects have been described in the literature for a large variety of reactions, [2][3][4][5][6] but few thermodynamic data are available concerning complexation reactions in micellar conditions, 7 and controversy persists regarding the structure of the complexes solubilized in the micelles. [8][9][10][11] In the present work, the effect of nonionic micelles composed of Brij 58 (C 16 EO 20 ) on the complexation of Cu(II) by original tartaric acid-based ligands, 12 named C x T (Figure 1), is investigated.…”

Section: Introductionmentioning

confidence: 99%

“…It has been established that micelles can cause an acceleration or inhibition of a given reaction relative to the equivalent reaction in aqueous media. These effects have been described in the literature for a large variety of reactions, − but few thermodynamic data are available concerning complexation reactions in micellar conditions, and controversy persists regarding the structure of the complexes solubilized in the micelles. − …”

Section: Introductionmentioning

confidence: 99%

Complexation of Cu(II) by Original Tartaric Acid−Based Ligands in Nonionic Micellar Media: Thermodynamic Study and Applications

et al. 2009

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The complexation of Cu(II) with original alkylamidotartaric acids (C(x)T) is investigated in homogeneous aqueous medium and in the presence of nonionic micelles of Brij 58 (C16EO20), thanks to various analytical techniques such as NMR self-diffusion experiments, CD and UV-vis spectroscopy, ESI mass spectrometry, pHmetry and micellar-enhanced ultrafiltration (MEUF). First, a complete speciation study proves the formation of dimeric complexes in water and provides their formation constants. Second, a similar study is led in the presence of nonionic micelles. It underlines a modification of the apparent equilibrium constants in micellar medium and demonstrates that the structure of the complexes is slightly modified in the presence of micelles. This thermodynamic and structural study is applied to modelize the evolution of the extraction yields of Cu(II) by the micelles as a function of pH and to identify the complexes extracted in the micelles. The effects of the chain length of the ligand (C3T vs C8T) on the solubilization properties are put into relief and discussed. Anionic species are proved to be more incorporated in the nonionic micelles than the cationic species. The extracting system constituted of octylamidotartaric acid (CsT) solubilized in nonionic micelles of Brij 58 is demonstrated to be very efficient for the extraction of Cu(II) by MEUF, this technique being an interesting green alternative to traditional solvent extraction.

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The effect of surfactant micelle media on the copper(II) and camium(II) complex formation with some ligands

Cited by 7 publications

References 9 publications

Copper fractionation with dissolved organic matter in natural waters and wastewater—a mixed micelle mediated methodology (cloud point extraction) employing flame atomic absorption spectrometry

Copper fractionation with dissolved organic matter in natural waters and wastewater—a mixed micelle mediated methodology (cloud point extraction) employing flame atomic absorption spectrometry

Acid-base and complexation properties of gem-diphosphonic and gem-diphosphinic acids in aqueous solutions and micellar media of surfactants

Complexation of Cu(II) by Original Tartaric Acid−Based Ligands in Nonionic Micellar Media: Thermodynamic Study and Applications

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