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Electrochemistry of selected halogenated pesticides and their complexes with cyclodextrins
Sokolová, Romana ; Hromadová, Magdaléna ; Pospíšil, Lubomír
A detailed investigation of electrochemical properties of triazine pesticides, carboxyimid-type pesticides and benzonitrile pesticides was studied. Their degradation pathways include the protonization reactions coupled with electron transfer and several side chemical reactions. The study of inclusion complexes of halogenated pesticides with cyclodextrins was performed. The inclusion into the molecular cavities markedly influenced the decomposition mechanism of these compounds by protection of reactive groups by cyclodextrin environment. The degradation products were identified by GC-MS analysis and in-situ IR spectroelectrochemistry.
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Voltametrie vysoce dispergovaných měděných prášků na rtuťových elektrodách
Heyrovský, Michael ; Korshunov, A. ; Bakardjieva, Snejana
Average size of majority of the tested powder particles was between 100 and 300 nm, which are kept in relatively stable dispersed form in electrolytic solutions by Brownian motion. Electrolytic activity of the particles was due to 10-30 nm thick surface layer of copper oxides, the outer side consisting of CuO, the inner side of Cu.sub.2./sub.O. The current due to electroreduction of surface copper oxides followed particulate mechanism: on fortuitous contact of particle with electrode surface an immediate transfer of a number of electrons takes place, determined by time of the contact and by several dynamic and steric factors. No diffusion flux of particles to electrode surface is established. The potential of particulate electroreduction is determined by electronic structure of the actual form of the solid state particle.
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