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When various properties of organic compounds are to be expressed, it is necessary to explore the connection between their experiment and theory. To determine the mechanism of the inhibition process by organic materials, the electron structure of a set of organic compounds is studied and correlated with their electrochemical corrosion measurements. This paper discusses the inhibition of corrosion in 5% hydrochloric acid by means of p-substituted anilines with respect to quantum chemistry.

The sorption capacity of two natural sorbents of different origin and of Wofatit KPS is determined by dynamic laboratory investigations and the influence of a thermal pretreatment of clinoptilolite, of the type and quantity of regenerants and of the presence of other cations is investigated. There are represented results of the ammonia removal from biologically treated municipal wastewater and of the removal of caesium-ions from laundry wastewaters. The capacity of clinoptilolite is lower than that of the ion-exchange resin, but clinoptilolite has the advantage of a considerably higher affinity for ammonium-ions, so that it can be used also in the presence of other salts in water t o be treated. The ammonium concentration should not exceed 30 mg/l, in order t o avoid too short filter runs.

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