Photometrisch-potentiometrische Bestimmung der Hydrolysenkonstanten vonN-Bromverbindungen |
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Authors: | Waldemar Gottardi |
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Institution: | (1) Institut für Hygiene, Universität Innsbruck, A-6010 Innsbruck, Österreich |
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Abstract: | The equilibrium concentrations of all reaction products emerging from the hydrolysis ofN-bromo compounds in the presence of bromide and thereby also the hydrolysis constants (K
1) have been calculated from the absorbance at 392.8 nm, thepH-value and the initial concentrations of theN-bromo compound and the bromide. The following compounds have been investigated:N-bromo-succinimide:K
1=2.2·10–6, 1,3-dibromo-5,5-dimethylhydantoin:K
1=1.7·10–5,N-bromoacetamide:K
1=1.8·10–6,N-bromo-monochloroacetamide: 5.2·10–6,N-bromo-dichloroacetamide:K
1=8.9·10–6 andN-bromo-trichloroacetamide:K
1=1.8·10–5. The precision of the method, which is mainly suited for weak hydrolizingN-bromocompounds (K
1<10–4) are discussed and the overall error of the calculated values was found to be in the range of ±5–12%. The reactivities in aqueous solution of the most frequently usedN-bromo compounds are compared by means of the calculated HOBr equilibrium concentrations. The differences to be expected on the basis of the latters are at concentrations >10–5 mol/l rather great, while they can be neglected in very dilute solutions (-10–6 mol/l). |
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Keywords: | Disinfection Equilibrium concentrations N-Halogene compounds Hydrolysis Reactivity of N-bromo compounds |
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