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The hardness quotient according to WANDT as a quotient from carbonate hardness and non‐carbonate hardness is used for the characterization of groundwater by its “age” and thus as an indicator of the risk of contamination. Due to its application, statements on the risk of nitrate‐carrying...
The present state of the above mentioned points, inclusive of the determination of the degree of exhaustion and of the effect of regeneration is described and the respective methods of investigation are briefly explained. The statements made in this article constitute the contents of two drafts...
Structure/reactivity relations are investigated experimentally and theoretically for the microbial degradation of 35 substituted phenols and anilines by adapted mixed cultures of bacteria. From the results one can conclude that the initial attack of the aromatic nucleus has an electrophilic...
A survey is given of the special conditions and their effects by means of a large number of examples. There should be pointed out especially the possible mass development of higher aquatic plants, partly high concentrations of turbidity‐causing substances, the lack of oxygen even at slight water...
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