Mn(II)-catalysed S(IV) oxidation and its inhibition by acetic acid in acidic aqueous solutions
Abstract The kinetics of the S(IV) oxidation by oxygen in the presence of Mn(II) ions and acetic acid has been studied. Experiments were carried out at 25°C, 3.5 ≤ pH ≤ 5.0, [S(IV)]≈1 × $ 10^{−3} $ mol/$ dm^{3} $, 1 × $ 10^{−6} $ mol/$ dm^{3} $ ≤ [Mn(II)] ≤ 1 × $ 10^{−5} $ mol/$ dm^{3} $, 1 × $ 10^{...
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Gespeichert in:
| Autor*in: |
Wilkosz, Irena [verfasserIn] |
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| Format: |
Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2008 |
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| Schlagwörter: |
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| Anmerkung: |
© Springer Science+Business Media B.V. 2008 |
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| Übergeordnetes Werk: |
Enthalten in: Journal of atmospheric chemistry - Springer Netherlands, 1983, 60(2008), 1 vom: Mai, Seite 1-17 |
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| Übergeordnetes Werk: |
volume:60 ; year:2008 ; number:1 ; month:05 ; pages:1-17 |
| Links: |
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| DOI / URN: |
10.1007/s10874-008-9105-2 |
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| Katalog-ID: |
OLC2061778283 |
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| 520 | |a Abstract The kinetics of the S(IV) oxidation by oxygen in the presence of Mn(II) ions and acetic acid has been studied. Experiments were carried out at 25°C, 3.5 ≤ pH ≤ 5.0, [S(IV)]≈1 × $ 10^{−3} $ mol/$ dm^{3} $, 1 × $ 10^{−6} $ mol/$ dm^{3} $ ≤ [Mn(II)] ≤ 1 × $ 10^{−5} $ mol/$ dm^{3} $, 1 × $ 10^{−6} $ mol/$ dm^{3} $ ≤ [$ CH_{3} $COOH] ≤ 1 × $ 10^{−4} $ mol/$ dm^{3} $. Based on the experimental results, rate constants and orders of the reactions were determined. Depending on the reaction conditions, the observed rate constants for the Mn(II)-catalysed S(IV) oxidation ranged between 3.91 × $ 10^{−8} $ and 8.89 × $ 10^{−7} $ (mol/$ dm^{3} $) $ s^{−1} $, and in the presence of acetic acid they ranged between 2.95 × $ 10^{−8} $ and 7.45 × $ 10^{−7} $ (mol/$ dm^{3} $) $ s^{−1} $. The reaction order in S(IV) was zero for both reactions. The effect of Mn(II) ion and acetic acid concentrations as well as an initial pH of the solution on the S(IV) oxidation rate was discussed. It was found that the rate of the S(IV) oxidation depends on the initial pH of the solution but it is independent of the pH change during the reaction. Acetic acid has a weak inhibiting effect on the Mn(II)-catalysed S(IV) oxidation. Under the experimental conditions the S(IV) oxidation rate decreased no more than twice. | ||
| 650 | 4 | |a Atmospheric chemistry | |
| 650 | 4 | |a S(IV) oxidation | |
| 650 | 4 | |a Manganese | |
| 650 | 4 | |a Acetic acid | |
| 650 | 4 | |a Catalysis | |
| 650 | 4 | |a Inhibition | |
| 700 | 1 | |a Mainka, Anna |4 aut | |
| 773 | 0 | 8 | |i Enthalten in |t Journal of atmospheric chemistry |d Springer Netherlands, 1983 |g 60(2008), 1 vom: Mai, Seite 1-17 |w (DE-627)130612650 |w (DE-600)793876-7 |w (DE-576)016123026 |x 0167-7764 |7 nnns |
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10.1007/s10874-008-9105-2 doi (DE-627)OLC2061778283 (DE-He213)s10874-008-9105-2-p DE-627 ger DE-627 rakwb eng 550 540 VZ Wilkosz, Irena verfasserin aut Mn(II)-catalysed S(IV) oxidation and its inhibition by acetic acid in acidic aqueous solutions 2008 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer Science+Business Media B.V. 2008 Abstract The kinetics of the S(IV) oxidation by oxygen in the presence of Mn(II) ions and acetic acid has been studied. Experiments were carried out at 25°C, 3.5 ≤ pH ≤ 5.0, [S(IV)]≈1 × $ 10^{−3} $ mol/$ dm^{3} $, 1 × $ 10^{−6} $ mol/$ dm^{3} $ ≤ [Mn(II)] ≤ 1 × $ 10^{−5} $ mol/$ dm^{3} $, 1 × $ 10^{−6} $ mol/$ dm^{3} $ ≤ [$ CH_{3} $COOH] ≤ 1 × $ 10^{−4} $ mol/$ dm^{3} $. Based on the experimental results, rate constants and orders of the reactions were determined. Depending on the reaction conditions, the observed rate constants for the Mn(II)-catalysed S(IV) oxidation ranged between 3.91 × $ 10^{−8} $ and 8.89 × $ 10^{−7} $ (mol/$ dm^{3} $) $ s^{−1} $, and in the presence of acetic acid they ranged between 2.95 × $ 10^{−8} $ and 7.45 × $ 10^{−7} $ (mol/$ dm^{3} $) $ s^{−1} $. The reaction order in S(IV) was zero for both reactions. The effect of Mn(II) ion and acetic acid concentrations as well as an initial pH of the solution on the S(IV) oxidation rate was discussed. It was found that the rate of the S(IV) oxidation depends on the initial pH of the solution but it is independent of the pH change during the reaction. Acetic acid has a weak inhibiting effect on the Mn(II)-catalysed S(IV) oxidation. Under the experimental conditions the S(IV) oxidation rate decreased no more than twice. Atmospheric chemistry S(IV) oxidation Manganese Acetic acid Catalysis Inhibition Mainka, Anna aut Enthalten in Journal of atmospheric chemistry Springer Netherlands, 1983 60(2008), 1 vom: Mai, Seite 1-17 (DE-627)130612650 (DE-600)793876-7 (DE-576)016123026 0167-7764 nnns volume:60 year:2008 number:1 month:05 pages:1-17 https://doi.org/10.1007/s10874-008-9105-2 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-CHE SSG-OLC-GEO SSG-OLC-PHA SSG-OLC-DE-84 SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_24 GBV_ILN_62 GBV_ILN_70 GBV_ILN_130 GBV_ILN_601 GBV_ILN_2012 GBV_ILN_4012 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 AR 60 2008 1 05 1-17 |
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10.1007/s10874-008-9105-2 doi (DE-627)OLC2061778283 (DE-He213)s10874-008-9105-2-p DE-627 ger DE-627 rakwb eng 550 540 VZ Wilkosz, Irena verfasserin aut Mn(II)-catalysed S(IV) oxidation and its inhibition by acetic acid in acidic aqueous solutions 2008 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer Science+Business Media B.V. 2008 Abstract The kinetics of the S(IV) oxidation by oxygen in the presence of Mn(II) ions and acetic acid has been studied. Experiments were carried out at 25°C, 3.5 ≤ pH ≤ 5.0, [S(IV)]≈1 × $ 10^{−3} $ mol/$ dm^{3} $, 1 × $ 10^{−6} $ mol/$ dm^{3} $ ≤ [Mn(II)] ≤ 1 × $ 10^{−5} $ mol/$ dm^{3} $, 1 × $ 10^{−6} $ mol/$ dm^{3} $ ≤ [$ CH_{3} $COOH] ≤ 1 × $ 10^{−4} $ mol/$ dm^{3} $. Based on the experimental results, rate constants and orders of the reactions were determined. Depending on the reaction conditions, the observed rate constants for the Mn(II)-catalysed S(IV) oxidation ranged between 3.91 × $ 10^{−8} $ and 8.89 × $ 10^{−7} $ (mol/$ dm^{3} $) $ s^{−1} $, and in the presence of acetic acid they ranged between 2.95 × $ 10^{−8} $ and 7.45 × $ 10^{−7} $ (mol/$ dm^{3} $) $ s^{−1} $. The reaction order in S(IV) was zero for both reactions. The effect of Mn(II) ion and acetic acid concentrations as well as an initial pH of the solution on the S(IV) oxidation rate was discussed. It was found that the rate of the S(IV) oxidation depends on the initial pH of the solution but it is independent of the pH change during the reaction. Acetic acid has a weak inhibiting effect on the Mn(II)-catalysed S(IV) oxidation. Under the experimental conditions the S(IV) oxidation rate decreased no more than twice. Atmospheric chemistry S(IV) oxidation Manganese Acetic acid Catalysis Inhibition Mainka, Anna aut Enthalten in Journal of atmospheric chemistry Springer Netherlands, 1983 60(2008), 1 vom: Mai, Seite 1-17 (DE-627)130612650 (DE-600)793876-7 (DE-576)016123026 0167-7764 nnns volume:60 year:2008 number:1 month:05 pages:1-17 https://doi.org/10.1007/s10874-008-9105-2 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-CHE SSG-OLC-GEO SSG-OLC-PHA SSG-OLC-DE-84 SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_24 GBV_ILN_62 GBV_ILN_70 GBV_ILN_130 GBV_ILN_601 GBV_ILN_2012 GBV_ILN_4012 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 AR 60 2008 1 05 1-17 |
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10.1007/s10874-008-9105-2 doi (DE-627)OLC2061778283 (DE-He213)s10874-008-9105-2-p DE-627 ger DE-627 rakwb eng 550 540 VZ Wilkosz, Irena verfasserin aut Mn(II)-catalysed S(IV) oxidation and its inhibition by acetic acid in acidic aqueous solutions 2008 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer Science+Business Media B.V. 2008 Abstract The kinetics of the S(IV) oxidation by oxygen in the presence of Mn(II) ions and acetic acid has been studied. Experiments were carried out at 25°C, 3.5 ≤ pH ≤ 5.0, [S(IV)]≈1 × $ 10^{−3} $ mol/$ dm^{3} $, 1 × $ 10^{−6} $ mol/$ dm^{3} $ ≤ [Mn(II)] ≤ 1 × $ 10^{−5} $ mol/$ dm^{3} $, 1 × $ 10^{−6} $ mol/$ dm^{3} $ ≤ [$ CH_{3} $COOH] ≤ 1 × $ 10^{−4} $ mol/$ dm^{3} $. Based on the experimental results, rate constants and orders of the reactions were determined. Depending on the reaction conditions, the observed rate constants for the Mn(II)-catalysed S(IV) oxidation ranged between 3.91 × $ 10^{−8} $ and 8.89 × $ 10^{−7} $ (mol/$ dm^{3} $) $ s^{−1} $, and in the presence of acetic acid they ranged between 2.95 × $ 10^{−8} $ and 7.45 × $ 10^{−7} $ (mol/$ dm^{3} $) $ s^{−1} $. The reaction order in S(IV) was zero for both reactions. The effect of Mn(II) ion and acetic acid concentrations as well as an initial pH of the solution on the S(IV) oxidation rate was discussed. It was found that the rate of the S(IV) oxidation depends on the initial pH of the solution but it is independent of the pH change during the reaction. Acetic acid has a weak inhibiting effect on the Mn(II)-catalysed S(IV) oxidation. Under the experimental conditions the S(IV) oxidation rate decreased no more than twice. Atmospheric chemistry S(IV) oxidation Manganese Acetic acid Catalysis Inhibition Mainka, Anna aut Enthalten in Journal of atmospheric chemistry Springer Netherlands, 1983 60(2008), 1 vom: Mai, Seite 1-17 (DE-627)130612650 (DE-600)793876-7 (DE-576)016123026 0167-7764 nnns volume:60 year:2008 number:1 month:05 pages:1-17 https://doi.org/10.1007/s10874-008-9105-2 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-CHE SSG-OLC-GEO SSG-OLC-PHA SSG-OLC-DE-84 SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_24 GBV_ILN_62 GBV_ILN_70 GBV_ILN_130 GBV_ILN_601 GBV_ILN_2012 GBV_ILN_4012 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 AR 60 2008 1 05 1-17 |
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10.1007/s10874-008-9105-2 doi (DE-627)OLC2061778283 (DE-He213)s10874-008-9105-2-p DE-627 ger DE-627 rakwb eng 550 540 VZ Wilkosz, Irena verfasserin aut Mn(II)-catalysed S(IV) oxidation and its inhibition by acetic acid in acidic aqueous solutions 2008 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer Science+Business Media B.V. 2008 Abstract The kinetics of the S(IV) oxidation by oxygen in the presence of Mn(II) ions and acetic acid has been studied. Experiments were carried out at 25°C, 3.5 ≤ pH ≤ 5.0, [S(IV)]≈1 × $ 10^{−3} $ mol/$ dm^{3} $, 1 × $ 10^{−6} $ mol/$ dm^{3} $ ≤ [Mn(II)] ≤ 1 × $ 10^{−5} $ mol/$ dm^{3} $, 1 × $ 10^{−6} $ mol/$ dm^{3} $ ≤ [$ CH_{3} $COOH] ≤ 1 × $ 10^{−4} $ mol/$ dm^{3} $. Based on the experimental results, rate constants and orders of the reactions were determined. Depending on the reaction conditions, the observed rate constants for the Mn(II)-catalysed S(IV) oxidation ranged between 3.91 × $ 10^{−8} $ and 8.89 × $ 10^{−7} $ (mol/$ dm^{3} $) $ s^{−1} $, and in the presence of acetic acid they ranged between 2.95 × $ 10^{−8} $ and 7.45 × $ 10^{−7} $ (mol/$ dm^{3} $) $ s^{−1} $. The reaction order in S(IV) was zero for both reactions. The effect of Mn(II) ion and acetic acid concentrations as well as an initial pH of the solution on the S(IV) oxidation rate was discussed. It was found that the rate of the S(IV) oxidation depends on the initial pH of the solution but it is independent of the pH change during the reaction. Acetic acid has a weak inhibiting effect on the Mn(II)-catalysed S(IV) oxidation. Under the experimental conditions the S(IV) oxidation rate decreased no more than twice. Atmospheric chemistry S(IV) oxidation Manganese Acetic acid Catalysis Inhibition Mainka, Anna aut Enthalten in Journal of atmospheric chemistry Springer Netherlands, 1983 60(2008), 1 vom: Mai, Seite 1-17 (DE-627)130612650 (DE-600)793876-7 (DE-576)016123026 0167-7764 nnns volume:60 year:2008 number:1 month:05 pages:1-17 https://doi.org/10.1007/s10874-008-9105-2 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-CHE SSG-OLC-GEO SSG-OLC-PHA SSG-OLC-DE-84 SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_24 GBV_ILN_62 GBV_ILN_70 GBV_ILN_130 GBV_ILN_601 GBV_ILN_2012 GBV_ILN_4012 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 AR 60 2008 1 05 1-17 |
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10.1007/s10874-008-9105-2 doi (DE-627)OLC2061778283 (DE-He213)s10874-008-9105-2-p DE-627 ger DE-627 rakwb eng 550 540 VZ Wilkosz, Irena verfasserin aut Mn(II)-catalysed S(IV) oxidation and its inhibition by acetic acid in acidic aqueous solutions 2008 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer Science+Business Media B.V. 2008 Abstract The kinetics of the S(IV) oxidation by oxygen in the presence of Mn(II) ions and acetic acid has been studied. Experiments were carried out at 25°C, 3.5 ≤ pH ≤ 5.0, [S(IV)]≈1 × $ 10^{−3} $ mol/$ dm^{3} $, 1 × $ 10^{−6} $ mol/$ dm^{3} $ ≤ [Mn(II)] ≤ 1 × $ 10^{−5} $ mol/$ dm^{3} $, 1 × $ 10^{−6} $ mol/$ dm^{3} $ ≤ [$ CH_{3} $COOH] ≤ 1 × $ 10^{−4} $ mol/$ dm^{3} $. Based on the experimental results, rate constants and orders of the reactions were determined. Depending on the reaction conditions, the observed rate constants for the Mn(II)-catalysed S(IV) oxidation ranged between 3.91 × $ 10^{−8} $ and 8.89 × $ 10^{−7} $ (mol/$ dm^{3} $) $ s^{−1} $, and in the presence of acetic acid they ranged between 2.95 × $ 10^{−8} $ and 7.45 × $ 10^{−7} $ (mol/$ dm^{3} $) $ s^{−1} $. The reaction order in S(IV) was zero for both reactions. The effect of Mn(II) ion and acetic acid concentrations as well as an initial pH of the solution on the S(IV) oxidation rate was discussed. It was found that the rate of the S(IV) oxidation depends on the initial pH of the solution but it is independent of the pH change during the reaction. Acetic acid has a weak inhibiting effect on the Mn(II)-catalysed S(IV) oxidation. Under the experimental conditions the S(IV) oxidation rate decreased no more than twice. Atmospheric chemistry S(IV) oxidation Manganese Acetic acid Catalysis Inhibition Mainka, Anna aut Enthalten in Journal of atmospheric chemistry Springer Netherlands, 1983 60(2008), 1 vom: Mai, Seite 1-17 (DE-627)130612650 (DE-600)793876-7 (DE-576)016123026 0167-7764 nnns volume:60 year:2008 number:1 month:05 pages:1-17 https://doi.org/10.1007/s10874-008-9105-2 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-CHE SSG-OLC-GEO SSG-OLC-PHA SSG-OLC-DE-84 SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_24 GBV_ILN_62 GBV_ILN_70 GBV_ILN_130 GBV_ILN_601 GBV_ILN_2012 GBV_ILN_4012 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 AR 60 2008 1 05 1-17 |
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Experiments were carried out at 25°C, 3.5 ≤ pH ≤ 5.0, [S(IV)]≈1 × $ 10^{−3} $ mol/$ dm^{3} $, 1 × $ 10^{−6} $ mol/$ dm^{3} $ ≤ [Mn(II)] ≤ 1 × $ 10^{−5} $ mol/$ dm^{3} $, 1 × $ 10^{−6} $ mol/$ dm^{3} $ ≤ [$ CH_{3} $COOH] ≤ 1 × $ 10^{−4} $ mol/$ dm^{3} $. Based on the experimental results, rate constants and orders of the reactions were determined. Depending on the reaction conditions, the observed rate constants for the Mn(II)-catalysed S(IV) oxidation ranged between 3.91 × $ 10^{−8} $ and 8.89 × $ 10^{−7} $ (mol/$ dm^{3} $) $ s^{−1} $, and in the presence of acetic acid they ranged between 2.95 × $ 10^{−8} $ and 7.45 × $ 10^{−7} $ (mol/$ dm^{3} $) $ s^{−1} $. The reaction order in S(IV) was zero for both reactions. The effect of Mn(II) ion and acetic acid concentrations as well as an initial pH of the solution on the S(IV) oxidation rate was discussed. It was found that the rate of the S(IV) oxidation depends on the initial pH of the solution but it is independent of the pH change during the reaction. Acetic acid has a weak inhibiting effect on the Mn(II)-catalysed S(IV) oxidation. 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550 540 VZ Mn(II)-catalysed S(IV) oxidation and its inhibition by acetic acid in acidic aqueous solutions Atmospheric chemistry S(IV) oxidation Manganese Acetic acid Catalysis Inhibition |
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ddc 550 misc Atmospheric chemistry misc S(IV) oxidation misc Manganese misc Acetic acid misc Catalysis misc Inhibition |
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mn(ii)-catalysed s(iv) oxidation and its inhibition by acetic acid in acidic aqueous solutions |
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Mn(II)-catalysed S(IV) oxidation and its inhibition by acetic acid in acidic aqueous solutions |
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Abstract The kinetics of the S(IV) oxidation by oxygen in the presence of Mn(II) ions and acetic acid has been studied. Experiments were carried out at 25°C, 3.5 ≤ pH ≤ 5.0, [S(IV)]≈1 × $ 10^{−3} $ mol/$ dm^{3} $, 1 × $ 10^{−6} $ mol/$ dm^{3} $ ≤ [Mn(II)] ≤ 1 × $ 10^{−5} $ mol/$ dm^{3} $, 1 × $ 10^{−6} $ mol/$ dm^{3} $ ≤ [$ CH_{3} $COOH] ≤ 1 × $ 10^{−4} $ mol/$ dm^{3} $. Based on the experimental results, rate constants and orders of the reactions were determined. Depending on the reaction conditions, the observed rate constants for the Mn(II)-catalysed S(IV) oxidation ranged between 3.91 × $ 10^{−8} $ and 8.89 × $ 10^{−7} $ (mol/$ dm^{3} $) $ s^{−1} $, and in the presence of acetic acid they ranged between 2.95 × $ 10^{−8} $ and 7.45 × $ 10^{−7} $ (mol/$ dm^{3} $) $ s^{−1} $. The reaction order in S(IV) was zero for both reactions. The effect of Mn(II) ion and acetic acid concentrations as well as an initial pH of the solution on the S(IV) oxidation rate was discussed. It was found that the rate of the S(IV) oxidation depends on the initial pH of the solution but it is independent of the pH change during the reaction. Acetic acid has a weak inhibiting effect on the Mn(II)-catalysed S(IV) oxidation. Under the experimental conditions the S(IV) oxidation rate decreased no more than twice. © Springer Science+Business Media B.V. 2008 |
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Abstract The kinetics of the S(IV) oxidation by oxygen in the presence of Mn(II) ions and acetic acid has been studied. Experiments were carried out at 25°C, 3.5 ≤ pH ≤ 5.0, [S(IV)]≈1 × $ 10^{−3} $ mol/$ dm^{3} $, 1 × $ 10^{−6} $ mol/$ dm^{3} $ ≤ [Mn(II)] ≤ 1 × $ 10^{−5} $ mol/$ dm^{3} $, 1 × $ 10^{−6} $ mol/$ dm^{3} $ ≤ [$ CH_{3} $COOH] ≤ 1 × $ 10^{−4} $ mol/$ dm^{3} $. Based on the experimental results, rate constants and orders of the reactions were determined. Depending on the reaction conditions, the observed rate constants for the Mn(II)-catalysed S(IV) oxidation ranged between 3.91 × $ 10^{−8} $ and 8.89 × $ 10^{−7} $ (mol/$ dm^{3} $) $ s^{−1} $, and in the presence of acetic acid they ranged between 2.95 × $ 10^{−8} $ and 7.45 × $ 10^{−7} $ (mol/$ dm^{3} $) $ s^{−1} $. The reaction order in S(IV) was zero for both reactions. The effect of Mn(II) ion and acetic acid concentrations as well as an initial pH of the solution on the S(IV) oxidation rate was discussed. It was found that the rate of the S(IV) oxidation depends on the initial pH of the solution but it is independent of the pH change during the reaction. Acetic acid has a weak inhibiting effect on the Mn(II)-catalysed S(IV) oxidation. Under the experimental conditions the S(IV) oxidation rate decreased no more than twice. © Springer Science+Business Media B.V. 2008 |
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Abstract The kinetics of the S(IV) oxidation by oxygen in the presence of Mn(II) ions and acetic acid has been studied. Experiments were carried out at 25°C, 3.5 ≤ pH ≤ 5.0, [S(IV)]≈1 × $ 10^{−3} $ mol/$ dm^{3} $, 1 × $ 10^{−6} $ mol/$ dm^{3} $ ≤ [Mn(II)] ≤ 1 × $ 10^{−5} $ mol/$ dm^{3} $, 1 × $ 10^{−6} $ mol/$ dm^{3} $ ≤ [$ CH_{3} $COOH] ≤ 1 × $ 10^{−4} $ mol/$ dm^{3} $. Based on the experimental results, rate constants and orders of the reactions were determined. Depending on the reaction conditions, the observed rate constants for the Mn(II)-catalysed S(IV) oxidation ranged between 3.91 × $ 10^{−8} $ and 8.89 × $ 10^{−7} $ (mol/$ dm^{3} $) $ s^{−1} $, and in the presence of acetic acid they ranged between 2.95 × $ 10^{−8} $ and 7.45 × $ 10^{−7} $ (mol/$ dm^{3} $) $ s^{−1} $. The reaction order in S(IV) was zero for both reactions. The effect of Mn(II) ion and acetic acid concentrations as well as an initial pH of the solution on the S(IV) oxidation rate was discussed. It was found that the rate of the S(IV) oxidation depends on the initial pH of the solution but it is independent of the pH change during the reaction. Acetic acid has a weak inhibiting effect on the Mn(II)-catalysed S(IV) oxidation. Under the experimental conditions the S(IV) oxidation rate decreased no more than twice. © Springer Science+Business Media B.V. 2008 |
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