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  • 1990-1994  (8)
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Material
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Year
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  • 1
    Electronic Resource
    Electronic Resource
    Acridine orange-bromate reaction. A kinetic method for the analysis of V(V) (1991)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 340 (1991), S. 173-174 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00324476
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Study on the kinetics of the reaction of thymol blue with acidic bromate catalysed by Ru(III) or V(V) (1994)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 349 (1994), S. 829-830 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The kinetics of the reaction between thymol blue and acidic bromate catalysed by Ru(III) or V(V) have been studied by monitoring the absorbance at 544 nm. The reaction showed a complex kinetic behaviour. The possible application to the catalytic determination of Ru(III) and V(V) is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00323114
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Studies on the molybdenum catalysed reaction between toluidine blue and stannous chloride (1993)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 345 (1993), S. 673-678 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The detailed kinetics of the reaction between toluidine blue (tolonium chloride) (TB+) and stannous chloride in acidic solution catalysed by Mo(VI) are studied. 1,10-phenanthroline activated the reaction. The scope of the reaction as indicator reaction, for the catalytic determination of molybdenum was explored. The effect of various interfering cations and anions on the method were investigated and optimum conditions for analysis of low concentrations of Mo (10−6 mol/l range) are described. Limitations of the method and alternatives for overcoming the interferences are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00325833
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    A kinetic study of the reduction of toluidine blue with thiourea in acidic solution (1992)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 24 (1992), S. 999-1007 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A detailed kinetic study of the reaction of toluidine blue (tolonium chloride) (TB+ Cl-) with thiourea (TU) in aqueous hydrochloric acid solution is reported. The reaction was first order with respect to toluidine blue and the reductant and second order with respect to [H+]. Thiourea had a 2:1 stoichiometric ratio with TB+. Toluidine blue was reduced to a colorless base in two one-electron reduction steps and TU was oxidized to thioformamidinium ion, which dimerized rapidly to give stable dithioformamidinium ion. The energy parameters obtained for TB+-TU reaction were mean energy of activation (Ea′) = 26.7 ± 2.4 kJ M-1; enthalpy of activation (ΔH#) = 24.2 kJ M-1; frequency factor (A) = 1.04 × 104 M-3 s-1; and entropy of activation (ΔS#) = -176.35 J M-1 s-1. © John Wiley & Sons, Inc.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550241110
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    A modified chain mechanism for the oxidation of malachite green with peroxydisulphate ion (1992)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 24 (1992), S. 1113-1116 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550241210
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Reduction of toluidine blue by stannous ion at low pH: Kinetics and simulations (1993)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 25 (1993), S. 745-753 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A detailed kinetic study of the reaction between toluidine blue (tolonium chloride) (TB+Cl-) and stannous chloride is carried out in aqueous hydrochloric acid. The depletion kinetics of toluidine blue were spectrometrically monitored at 626 nm. The reaction had fractional order with respect to toluidine blue (one half), three halves with respect to Sn2+, and first-order dependence on H+ ion. Stoichiometric ratio between reductant and oxidant is 1:1. During the reaction Sn2+ is oxidized to Sn4+ and toluidine blue is reduced to colorless base in two univalent steps. © 1993 John Wiley & Sons, Inc.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550250905
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    The oxidation of 3,3′-dimethoxy benzidine with potassium bromate in acidic solutions (1991)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 23 (1991), S. 113-125 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The kinetics and mechanism of the oxidation of 3,3′-dimethoxybenzidine (oda, o-dianisidine) by potassium bromate in aqueous acidic medium were studied by monitoring the formation rate of the reaction product, 3,3′-dimethoxy 4,4′-diphenoquinone at 447 nm. The reaction is, first order with respect to both the substrate and oxidant, and second order with respect to H+. The oda: bromate stoichiometric ratio is 1:1. Plausible mechanism and rate laws are proposed accounting the experimental findings. Computer simulations were done using the proposed mechanism.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550230203
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    A kinetic approach for the mechanism of malachite green-peroxydisulphate reaction in aqueous solution (1992)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 24 (1992), S. 41-49 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The oxidation kinetics of malachite green (MG) with peroxydisulphate ion (PDS) were investigated by monitoring the absorbance change at 618 nm, in aqueous solutions under buffered and unbuffered conditions. Under both conditions, the reaction had first order dependence on reductant and a fractional order (one half) dependence on the oxidant. The stoichiometric ratio between MG and PDS was 1:2. The reaction had a negative salt effect. Reaction rates were enhanced under both high or low pH relative to neutral conditions. A plausible mechanism is proposed.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550240106
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    Paper (German National Licenses)
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