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  • 1
    Electronic Resource
    Electronic Resource
    Gamma-radiation induced oxidation of p-hydroquinone in aqueous solutions (1986)
    Springer
    Journal of radioanalytical and nuclear chemistry 97 (1986), S. 317-327 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract P-hydroquinone (H2Q) has been gamma-irradiated in the presence of O2 and different alcohols in acidic solutions. In the presence of tert-BuOH, the oxidation products were quinone(q), 2-hydroxybenzoquinone (2-Q-OH) and hydrogen peroxide (H2O2). In case of propan-2-ol, ethanol and methanol, the oxidation products were as above in addition to a carbonyl compound. A chain reaction was observed in case of propan-2-ol and this was inhibited by H2Q. The dependence of G(Q) and G(H2O2) on pH is a titration-type curve and the species responsible for this curve is assumed to be the protonated and unprotonated alcohol peroxy radicals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02035677
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  • 2
    Electronic Resource
    Electronic Resource
    Radiolysis of p-benzoquinone solutions (1986)
    Springer
    Journal of radioanalytical and nuclear chemistry 98 (1986), S. 151-165 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The γ-radiolysis of p-benzoquinone (Q) at different concentrations of H2SO4, Q, O2 and Cl− are p-hydroquinone (H2 Q), 2-hydroxy-p-benzoquinone (2-Q-OH) and H2O2. The effect of Cl− on yields is similar to its effect in deaerated solutions. The yields of H2Q and 2-Q-Oh are lower than in deaerated solutions. In the presence of simple aliphatic alcohols, a carbonyl compound is also measured in addition to those mentioned above. This system is found to be more complex than in deaerated solutions. Q and O2 were found to compete for the radical R1 R2 COH and good agreement was obtained between observed and reported rate coefficients of the reactions involved. There is some evidence that at lower pH, alcohol peroxy radicals are also able to undergo electron transfer with quinone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02060443
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  • 3
    Electronic Resource
    Electronic Resource
    Gamma-radiation induced oxidation of p-hydroquinone in aqueous solutions (1985)
    Springer
    Journal of radioanalytical and nuclear chemistry 92 (1985), S. 93-103 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The products of γ-radiation induced oxidation of p-hydroquinone (H2Q) solutions are p-quinone (Q), 2-hydroxybenzoquinone (2-Q-OH) and hydrogen peroxide (H2O2). The effects of dose, [O2], [H2Q], pH and different anions on yields have been investigated. Plots of G(Q) and G (H2O2) versus pH give titration type curves with pK of ∼1.2 and 1.3, respectively. This pK was attributed to protonation of the HO2 radical. The protonated form can oxidize H2Q. The neutral form of this radical appears to react with the semiquinone radical (HQ) to form (2-Q-OH) or disproportionate to give H2O2. A reaction mechanism is proposed to account for the experimental observations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02065393
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  • 4
    Electronic Resource
    Electronic Resource
    Removal of radiocobalt form aqueous solutions by inorganic exchangers (1990)
    Springer
    Journal of radioanalytical and nuclear chemistry 141 (1990), S. 25-39 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The sorption of radiocobalt from aqueous as well as organic solvents by natural and treated clays has been investigated. The effect of many factors, such as time, pH, carrier concentration, etc., were studied. In was found that the uptake is maximum in neutral, or slightly alkaline solutions. The rate of sorption depends on the velocity of shaking, which may indicate the operation of the film-diffusion mechanism, in addition to some contribution from particle-diffusion mechanism, but the dependence of the rate on shaking velocity could be attributed to an increase in the surface area of the clays. The conclusion is that natural clays are well suited for the removal of radioactive cobalt with slight, if any modification. These clays may be considered superior to synthetic exchangers for the removal of60Co, if the availibility and prices of the former are taken into account.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02060182
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  • 5
    Electronic Resource
    Electronic Resource
    Radiolysis of p-benzoquinone solutions (1986)
    Springer
    Journal of radioanalytical and nuclear chemistry 98 (1986), S. 17-29 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The products of the continuous radiolysis of p-benzoquinone (Q) at different concentrations of H2SO4, Q and Cl− are p-hydroquinone (H2Q) and 2-hydroxy-p-benzoquinone (2-Q-OH). In the presence of some alcohols, a carbonyl compound is produced in addition to H2Q and 2-Q-OH. The dependence of G values of the products on these factors is described. The material balance between G(-Q) and G(H2Q)+G(2-Q-OH) is maintained. The experimental results indicate the occurrence of the following reaction: $$H\dot Q + Cl_2 \to \to Q + H^ + + 2Cl^ - $$ . By competition studies, it was possible to evaluate the rate coefficients for the following reactions: $$SO_4^{\mathop \cdot \limits^ - } + Q\xrightarrow{{H_2 O}}HSO_4^ - + \dot Q - OH(k \cong 3.5 \cdot 10^8 M^{ - 1} \cdot s^{ - 1} ), SO_2^{\mathop \cdot \limits^ - } + Cl^ - \to SO_4^{ - 2} + Cl(k \cong 3.1 \cdot 10^8 M^{ - 1} \cdot s$$ .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02060429
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  • 6
    Electronic Resource
    Electronic Resource
    Labelling of long chain fatty acids by non isotopic nucleophilic halogen exchange (1985)
    Springer
    Journal of radioanalytical and nuclear chemistry 90 (1985), S. 225-231 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The parameters of two exchange methods of preparing pure 97% labelled 17-Br-HDA in acetone and in benzene with dry NaI* in a closed system are described. In aprotic solvents the need for a phase transfer catalyst up to 50μg is necessary to dissolve the dry NaI*. The use of aqueous medium in the exchange is totally prohibited. Energies of activation are calculated for both reactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02060776
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  • 7
    Electronic Resource
    Electronic Resource
    Labelling of castor oil for myocardial study (1985)
    Springer
    Journal of radioanalytical and nuclear chemistry 89 (1985), S. 97-107 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The labelling of castor oil, hydrolyzed castor oil and oleic acid by iodine monochloride and chloramine-T has been investigated. The effect of iodinating agent and concentration of castor oil on labelling yield has been studied. A comparative pharmacological study with analogous aliphatic fatty acids was caried out. Castor oil labelled with iodine monochloride concentrates in heart and liver in good proportion, better than other natural fatty acids and nearly equal to analogous fatty acids. Infrared study revealed that the OH group in ricinoleic acid may protect the125I added across the double bond with minor changes in biochemical properties and better extraction by the muscle of the heart.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02070208
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  • 8
    Electronic Resource
    Electronic Resource
    Corrosion of aluminium in alkaline solutions (1991)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 22 (1991), S. 301-307 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The corrosion of Al in NaOH solutions has been investigated using polarization method as well as weight loss method. The effect of various organic and inorganic compounds on the rate of corrosion was studied. The results indicated that the rate of Al corrosion is maximum at [NaOH] ∼4M. Various benzoic acid as well as other organic acids inhibit the corrosion but to different extents depending on the structure. The inhibition is due to adsorption of these acids and not due to neutralizing effect. Some sulpher containing compounds inhibit the corrosion but to lesser extent than acids. Aniline and its derivative are mostly activators for corrosion.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19910220805
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  • 9
    Electronic Resource
    Electronic Resource
    Corrosion Behaviour of brass in nitric acid solutions (1992)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 23 (1992), S. 188-196 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The corrosion of Brass in nitric acid solutions is studied using thermometric, mass loss and polarization methods. The three methods gave almost similar results. The rate of corrosion was found to increase steadily with nitric acid concentration till about 9M where it starts to slow down. Different inorganic anions at different concentration were used as additives at 5 and 9 M acid and they behave as mixed inhibitors. The open circuit potentials (OCP) were found to depend on acid as well as inhibitor concentrations.The effect of CrO42- and CI- were studied in more detail than other anions. The effect of nitrate ion is to accelerate corrosion at low acid concentration and slightly inhibits the corrosion at 9 M acid. This behaviour was attributed to the adsorption of the ion on the Zn part of the alloy where it enhances corrosion while the ion adsorped on the Cu part of the alloy leads to the retardation of corrosion and the net effect will be the result of these opposing processes.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19920230515
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  • 10
    Electronic Resource
    Electronic Resource
    The behaviour of Tin Electrode in aqueous solutions (1994)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 25 (1994), S. 292-299 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The behaviour of Sn electrode in aqueous solutions was investigated in the presence of some additives. The effect of Cl- in a very wide range of concentration (10-6-10M) was thourgly investigated. The effect of time, temperature, stirring, nitrogen bubbling, cathodic reduction, added cations and anions, and pH were studied. It was observed that in all cases the potential drifts positivly and the attainment of steady state potentials is faster at higher [Cl-] and the differences between immersion and steady state potentials gets smaller the higher [Cl-]. The stirring of solutions and the bubbling of N2 has little effect on the potential. The rise in temperature was found to make the steady state potential more negative at higher temperature. At 1 MNaCl, the OCP-pH diagram shows two linear parts covering the pH range 1-8 and 8-13 indicating the presence of two different mechanisms.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19940250706
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