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Ivanka Pižeta - One of the best experts on this subject based on the ideXlab platform.

  • Electrochemical Characterization of Iron(III)–Glycine–Nitrilotriacetate Mixed Ligand Complexes and Their Stability in Aqueous Solutions
    Croatica Chemica Acta, 2006
    Co-Authors: Vlado Cuculić, Ivanka Pižeta
    Abstract:

    Electrochemical characterisation of Iron(III)-glycine-Nitrilotriacetate (Iron(III)-Gly-NTA) mixed ligand complexes and determination of their stability constants and retention time in aqueous solution (I = 0.1 mol dm-3 in NaClO4, pH = 8.0+-0.1 at 25+-1 oC) using differential pulse cathodic voltammetry (DPCV), cyclic voltammetry (CV) and direct current (d.c.) polarography with a static mercury drop electrode (SMDE), were performed. Iron(III) concentrations were varied from 5×10-6 to 6×10-4 mol dm-3, NTA total concentrations varied from 2×10-5 to 1×10-3 mol dm-3 and glycine total concentrations were 0.2, 0.02 and 0.002 mol dm-3. Iron(III) redox reaction in the mixed ligand system (with the techniques employed) was found to be the one-electron reversible process. For the total concentration ratios of 1 : 800 : 2 for Iron(III), glycine and NTA, respectively, the Iron(III)-Gly-NTA mixed ligand complexes are dissolved and stable (>18 hours) in the aqueous solution. The complexes were formed either by the addition of NTA into the Iron(III) and glycine aqueous solution or by the addition of Iron(III) to the mixture of glycine and NTA. Under these conditions, Iron(III) hydrolysis was suppressed to the great extent. By fitting of experimental data following stability constants for mixed ligand complexes, not found in the literature so far, in 0.1 mol dm-3 NaClO4 aqueous solution were calculated: for Iron(III) log beta1([FeGlyNTA]-) = 27.23+-0.69, log beta2([Fe(Gly)2NTA]2-) = 30.29+-0.77 ; for Iron(II) log beta1([FeGlyNTA]2-) = 14.13+-0.43 and log beta2([Fe(Gly)2NTA]3-) = 18.51+-0.51.

  • electrochemical characterization of Iron iii glycine Nitrilotriacetate mixed ligand complexes and their stability in aqueous solutions
    Croatica Chemica Acta, 2006
    Co-Authors: Vlado Cuculic, Ivanka Pižeta
    Abstract:

    Electrochemical characterisation of Iron(III)-glycine-Nitrilotriacetate (Iron(III)-Gly-NTA) mixed ligand complexes and determination of their stability constants and retention time in aqueous solution (I = 0.1 mol dm-3 in NaClO4, pH = 8.0+-0.1 at 25+-1 oC) using differential pulse cathodic voltammetry (DPCV), cyclic voltammetry (CV) and direct current (d.c.) polarography with a static mercury drop electrode (SMDE), were performed. Iron(III) concentrations were varied from 5×10-6 to 6×10-4 mol dm-3, NTA total concentrations varied from 2×10-5 to 1×10-3 mol dm-3 and glycine total concentrations were 0.2, 0.02 and 0.002 mol dm-3. Iron(III) redox reaction in the mixed ligand system (with the techniques employed) was found to be the one-electron reversible process. For the total concentration ratios of 1 : 800 : 2 for Iron(III), glycine and NTA, respectively, the Iron(III)-Gly-NTA mixed ligand complexes are dissolved and stable (>18 hours) in the aqueous solution. The complexes were formed either by the addition of NTA into the Iron(III) and glycine aqueous solution or by the addition of Iron(III) to the mixture of glycine and NTA. Under these conditions, Iron(III) hydrolysis was suppressed to the great extent. By fitting of experimental data following stability constants for mixed ligand complexes, not found in the literature so far, in 0.1 mol dm-3 NaClO4 aqueous solution were calculated: for Iron(III) log beta1([FeGlyNTA]-) = 27.23+-0.69, log beta2([Fe(Gly)2NTA]2-) = 30.29+-0.77 ; for Iron(II) log beta1([FeGlyNTA]2-) = 14.13+-0.43 and log beta2([Fe(Gly)2NTA]3-) = 18.51+-0.51.

Pižeta Ivanka - One of the best experts on this subject based on the ideXlab platform.

  • Electrochemical characterization of Iron(III)-glycine-Nitrilotriacetate mixed ligand complexes and their stability in aqueous solutions
    'Croatian Chemical Society', 2006
    Co-Authors: Cuculić Vlado, Pižeta Ivanka
    Abstract:

    Electrochemical characterization of Iron(III)-glycine-Nitrilotriacetate (Iron(Ill)-Gly-NTA) mixed ligand complexes and determination of their stability constants and retention time in aqueous solutions (I = 0.1 mol dm(-3) in NaClO4, pH = 8.0 +/- 0.1 at 25 +/- 1 degrees C), using differential pulse cathodic voltammetry (DPCV), cyclic voltammetry (CV) and direct current (d.c.) polarography with a static mercury drop electrode (SMDE), were performed. Iron(Ill) concentrations were varied from 5x10(-6) to 6x10(-4) mol dm(-3), NTA total concentrations varied from 2x10(-5) to 1x10(-3) mol dm(-3) and glycine total concentrations were 0.2, 0.02 and 0.002 mol dm(-3). lron(Ill) redox reaction in the mixed ligand system (by the techniques employed) was found to be a one-electron reversible process. At total concentration ratios of I : 800 : 2 for Iron(III), glycine and NTA, respectively, the Iron(Ill)-Gly-NTA mixed ligand complexes were dissolved and stable (> 18 hours) in the aqueous solution. The complexes were formed either by the addition of NTA into the Iron(111) and glycine aqueous solution or by the addition of Iron(111) to the mixture of glycine and NTA. Under these conditions, Iron(III) hydrolysis was highly suppressed. By fitting of experimental data, the following stability constants for mixed ligand complexes, not found in the literature so far, in 0.1 mol dm(-3) NaClO4 aqueous solution were calculated: for Iron(111) log beta(1)([FeGlyNTA](-)) = 27.23 +/- 0.69, log beta(2)([Fe(Gly)(2)NTA](2-)) = 30.29 +/- 0.77; for Iron(II) log beta(1)([FeGlyNTA](2-)) = 14.13 +/- 0.43 and log beta(2)([Fe(Gly)(2)NTA](3-)) 18.51 +/- 0.51

  • Elektrokemijska karakterizacija miješanih kompleksa željeza(III) s glicinom i nitrilotriacetatom i njihova stabilnost u vodenim otopinama
    'Croatian Chemical Society', 2006
    Co-Authors: Cuculić Vlado, Pižeta Ivanka
    Abstract:

    Electrochemical characterization of Iron(III)–glycine–Nitrilotriacetate (Iron(III)-Gly-NTA) mixed ligand complexes and determination of their stability constants and retention time in aqueous solutions (I = 0.1 mol dm–3 in NaClO4, pH = 8.0±0.1 at 25±1 °C), using differential pulse cathodic voltammetry (DPCV), cyclic voltammetry (CV) and direct current (d.c.) polarography with a static mercury drop electrode (SMDE), were performed. Iron(III) concentrations were varied from 5×10–6 to 6×10–4 mol dm–3, NTA total concentrations varied from 2×10–5 to 1×10–3 mol dm–3 and glycine total concentrations were 0.2, 0.02 and 0.002 mol dm–3. Iron(III) redox reaction in the mixed ligand system (by the techniques employed) was found to be a one-electron reversible process. At total concentration ratios of 1 : 800 : 2 for Iron(III), glycine and NTA, respectively, the Iron(III)-Gly-NTA mixed ligand complexes were dissolved and stable (>18 hours) in the aqueous solution. The complexes were formed either by the addition of NTA into the Iron(III) and glycine aqueous solution or by the addition of Iron(III) to the mixture of glycine and NTA. Under these conditions, Iron(III) hydrolysis was highly suppressed. By fitting of experimental data, the following stability constants for mixed ligand complexes, not found in the literature so far, in 0.1 mol dm–3 NaClO4 aqueous solution were calculated: for Iron(III) log β1([FeGlyNTA]) = 27.23±0.69, log β2([Fe(Gly)2NTA]2–) = 30.29±0.77; for Iron(II) log β 1([FeGlyNTA]2–) = 14.13±0.43 and log β 2([Fe(Gly)2NTA]3–) = 18.51±0.51.Elektrokemijski su karakterizirani miješani kompleksi željeza(III) s glicinom i nitrilotriacetatom (FeIIIGly- NTA), te su određene njihove konstante stabilnosti i vrijeme zadržavanja u vodenim otopinama (I = 0,1 mol dm–3 u NaClO4, pH = 8,0±0,1 pri 25±1 °C) diferencijalnom pulsnom katodnom voltametrijom (DPKV), cikličkom voltametrijom (CV), te polarografijom s izravnim uzorkovanjem struje na elektrodi s visećom živinom kapi. Koncentracije željeza(III) mijenjane su od 5×10–6 do 6×10–4 mol dm–3, ukupne koncentracije NTA od 2×10–5 do 1×10–3 mol dm–3, dok su ukupne koncentracije glicina bile 0,2, 0,02 i 0,002 mol dm–3. Redoks reakcija željeza( III) u sustavu miješanih liganada (uporabljenim tehnikama) bila je jednoelektronski reverzibilni proces. Pri omjeru totalnih koncentracija 1 : 800 : 2 (željezo : glicin : NTA), FeIIIGlyNTA kompleksi su otopljeni i stabilni (>18 sati) u vodenoj otopini. Kompleksi su formirani kako dodatkom NTA u vodenu otopinu željeza(III) i glicina tako i dodatkom željeza(III) u smjesu glicina i NTA. Pod ovim uvjetima hidroliza željeza(III) je u većoj mjeri spriječena. Primjenom eksperimentalnih podataka izračunate su konstante stabilnosti kompleksa miješanih liganada u 0,1 mol dm–3 NaClO4, koje do sada nisu opisane u literaturi: za željezo(III) log β1([FeGlyNTA]–) = 27,23±0,69 i log β 2([Fe(Gly)2NTA]2–) = 30,29±0,77; za željezo(II) log β1([FeGlyNTA]2–) = 14,13±0,43 i log β2([Fe(Gly)2NTA]3–) = 18,51±0,51

Vlado Cuculi - One of the best experts on this subject based on the ideXlab platform.

  • Electrochemical Characterization of Iron(III)–Glycine–Nitrilotriacetate Mixed Ligand Complexes and Their Stability in Aqueous Solutions*
    2005
    Co-Authors: Vlado Cuculi
    Abstract:

    Electrochemical characterization of Iron(III)–glycine–Nitrilotriacetate (Iron(III)-Gly-NTA) mix-ed ligand complexes and determination of their stability constants and retention time in aque-ous solutions (I = 0.1 mol dm–3 in NaClO4, pH = 8.00.1 at 251 °C), using differential pulse cathodic voltammetry (DPCV), cyclic voltammetry (CV) and direct current (d.c.) polarography with a static mercury drop electrode (SMDE), were performed. Iron(III) concentrations were varied from 5×10–6 to 6×10–4 mol dm–3, NTA total concentrations varied from 2×10–5 to 1×10–3 mol dm–3 and glycine total concentrations were 0.2, 0.02 and 0.002 mol dm–3. Iron(III) redox reaction in the mixed ligand system (by the techniques employed) was found to be a one-electron reversible process. At total concentration ratios of 1: 800: 2 for Iron(III), glycine and NTA, respectively, the Iron(III)-Gly-NTA mixed ligand complexes were dissolved and sta-ble (>18 hours) in the aqueous solution. The complexes were formed either by the addition of NTA into the Iron(III) and glycine aqueous solution or by the addition of Iron(III) to the mix-ture of glycine and NTA. Under these conditions, Iron(III) hydrolysis was highly suppressed. By fitting of experimental data, the following stability constants for mixed ligand complexes, not found in the literature so far, in 0.1 mol dm–3 NaClO4 aqueous solution were calculated: for Iron(III) log b1(FeGlyNTA –) = 27.230.69, log b2(Fe(Gly)2NTA 2–) = 30.290.77; for Iron(II) log b1(FeGlyNTA 2–) = 14.130.43 and log b2(Fe(Gly)2NT

Cuculić Vlado - One of the best experts on this subject based on the ideXlab platform.

  • Electrochemical characterization of Iron(III)-glycine-Nitrilotriacetate mixed ligand complexes and their stability in aqueous solutions
    'Croatian Chemical Society', 2006
    Co-Authors: Cuculić Vlado, Pižeta Ivanka
    Abstract:

    Electrochemical characterization of Iron(III)-glycine-Nitrilotriacetate (Iron(Ill)-Gly-NTA) mixed ligand complexes and determination of their stability constants and retention time in aqueous solutions (I = 0.1 mol dm(-3) in NaClO4, pH = 8.0 +/- 0.1 at 25 +/- 1 degrees C), using differential pulse cathodic voltammetry (DPCV), cyclic voltammetry (CV) and direct current (d.c.) polarography with a static mercury drop electrode (SMDE), were performed. Iron(Ill) concentrations were varied from 5x10(-6) to 6x10(-4) mol dm(-3), NTA total concentrations varied from 2x10(-5) to 1x10(-3) mol dm(-3) and glycine total concentrations were 0.2, 0.02 and 0.002 mol dm(-3). lron(Ill) redox reaction in the mixed ligand system (by the techniques employed) was found to be a one-electron reversible process. At total concentration ratios of I : 800 : 2 for Iron(III), glycine and NTA, respectively, the Iron(Ill)-Gly-NTA mixed ligand complexes were dissolved and stable (> 18 hours) in the aqueous solution. The complexes were formed either by the addition of NTA into the Iron(111) and glycine aqueous solution or by the addition of Iron(111) to the mixture of glycine and NTA. Under these conditions, Iron(III) hydrolysis was highly suppressed. By fitting of experimental data, the following stability constants for mixed ligand complexes, not found in the literature so far, in 0.1 mol dm(-3) NaClO4 aqueous solution were calculated: for Iron(111) log beta(1)([FeGlyNTA](-)) = 27.23 +/- 0.69, log beta(2)([Fe(Gly)(2)NTA](2-)) = 30.29 +/- 0.77; for Iron(II) log beta(1)([FeGlyNTA](2-)) = 14.13 +/- 0.43 and log beta(2)([Fe(Gly)(2)NTA](3-)) 18.51 +/- 0.51

  • Elektrokemijska karakterizacija miješanih kompleksa željeza(III) s glicinom i nitrilotriacetatom i njihova stabilnost u vodenim otopinama
    'Croatian Chemical Society', 2006
    Co-Authors: Cuculić Vlado, Pižeta Ivanka
    Abstract:

    Electrochemical characterization of Iron(III)–glycine–Nitrilotriacetate (Iron(III)-Gly-NTA) mixed ligand complexes and determination of their stability constants and retention time in aqueous solutions (I = 0.1 mol dm–3 in NaClO4, pH = 8.0±0.1 at 25±1 °C), using differential pulse cathodic voltammetry (DPCV), cyclic voltammetry (CV) and direct current (d.c.) polarography with a static mercury drop electrode (SMDE), were performed. Iron(III) concentrations were varied from 5×10–6 to 6×10–4 mol dm–3, NTA total concentrations varied from 2×10–5 to 1×10–3 mol dm–3 and glycine total concentrations were 0.2, 0.02 and 0.002 mol dm–3. Iron(III) redox reaction in the mixed ligand system (by the techniques employed) was found to be a one-electron reversible process. At total concentration ratios of 1 : 800 : 2 for Iron(III), glycine and NTA, respectively, the Iron(III)-Gly-NTA mixed ligand complexes were dissolved and stable (>18 hours) in the aqueous solution. The complexes were formed either by the addition of NTA into the Iron(III) and glycine aqueous solution or by the addition of Iron(III) to the mixture of glycine and NTA. Under these conditions, Iron(III) hydrolysis was highly suppressed. By fitting of experimental data, the following stability constants for mixed ligand complexes, not found in the literature so far, in 0.1 mol dm–3 NaClO4 aqueous solution were calculated: for Iron(III) log β1([FeGlyNTA]) = 27.23±0.69, log β2([Fe(Gly)2NTA]2–) = 30.29±0.77; for Iron(II) log β 1([FeGlyNTA]2–) = 14.13±0.43 and log β 2([Fe(Gly)2NTA]3–) = 18.51±0.51.Elektrokemijski su karakterizirani miješani kompleksi željeza(III) s glicinom i nitrilotriacetatom (FeIIIGly- NTA), te su određene njihove konstante stabilnosti i vrijeme zadržavanja u vodenim otopinama (I = 0,1 mol dm–3 u NaClO4, pH = 8,0±0,1 pri 25±1 °C) diferencijalnom pulsnom katodnom voltametrijom (DPKV), cikličkom voltametrijom (CV), te polarografijom s izravnim uzorkovanjem struje na elektrodi s visećom živinom kapi. Koncentracije željeza(III) mijenjane su od 5×10–6 do 6×10–4 mol dm–3, ukupne koncentracije NTA od 2×10–5 do 1×10–3 mol dm–3, dok su ukupne koncentracije glicina bile 0,2, 0,02 i 0,002 mol dm–3. Redoks reakcija željeza( III) u sustavu miješanih liganada (uporabljenim tehnikama) bila je jednoelektronski reverzibilni proces. Pri omjeru totalnih koncentracija 1 : 800 : 2 (željezo : glicin : NTA), FeIIIGlyNTA kompleksi su otopljeni i stabilni (>18 sati) u vodenoj otopini. Kompleksi su formirani kako dodatkom NTA u vodenu otopinu željeza(III) i glicina tako i dodatkom željeza(III) u smjesu glicina i NTA. Pod ovim uvjetima hidroliza željeza(III) je u većoj mjeri spriječena. Primjenom eksperimentalnih podataka izračunate su konstante stabilnosti kompleksa miješanih liganada u 0,1 mol dm–3 NaClO4, koje do sada nisu opisane u literaturi: za željezo(III) log β1([FeGlyNTA]–) = 27,23±0,69 i log β 2([Fe(Gly)2NTA]2–) = 30,29±0,77; za željezo(II) log β1([FeGlyNTA]2–) = 14,13±0,43 i log β2([Fe(Gly)2NTA]3–) = 18,51±0,51

Vlado Cuculić - One of the best experts on this subject based on the ideXlab platform.

  • Electrochemical Characterization of Iron(III)–Glycine–Nitrilotriacetate Mixed Ligand Complexes and Their Stability in Aqueous Solutions
    Croatica Chemica Acta, 2006
    Co-Authors: Vlado Cuculić, Ivanka Pižeta
    Abstract:

    Electrochemical characterisation of Iron(III)-glycine-Nitrilotriacetate (Iron(III)-Gly-NTA) mixed ligand complexes and determination of their stability constants and retention time in aqueous solution (I = 0.1 mol dm-3 in NaClO4, pH = 8.0+-0.1 at 25+-1 oC) using differential pulse cathodic voltammetry (DPCV), cyclic voltammetry (CV) and direct current (d.c.) polarography with a static mercury drop electrode (SMDE), were performed. Iron(III) concentrations were varied from 5×10-6 to 6×10-4 mol dm-3, NTA total concentrations varied from 2×10-5 to 1×10-3 mol dm-3 and glycine total concentrations were 0.2, 0.02 and 0.002 mol dm-3. Iron(III) redox reaction in the mixed ligand system (with the techniques employed) was found to be the one-electron reversible process. For the total concentration ratios of 1 : 800 : 2 for Iron(III), glycine and NTA, respectively, the Iron(III)-Gly-NTA mixed ligand complexes are dissolved and stable (>18 hours) in the aqueous solution. The complexes were formed either by the addition of NTA into the Iron(III) and glycine aqueous solution or by the addition of Iron(III) to the mixture of glycine and NTA. Under these conditions, Iron(III) hydrolysis was suppressed to the great extent. By fitting of experimental data following stability constants for mixed ligand complexes, not found in the literature so far, in 0.1 mol dm-3 NaClO4 aqueous solution were calculated: for Iron(III) log beta1([FeGlyNTA]-) = 27.23+-0.69, log beta2([Fe(Gly)2NTA]2-) = 30.29+-0.77 ; for Iron(II) log beta1([FeGlyNTA]2-) = 14.13+-0.43 and log beta2([Fe(Gly)2NTA]3-) = 18.51+-0.51.