Daten aus dem Werdegange des Südatlantischen Raumes

Ohne Zusammenfassung     

Geologie und Paläontologie im neuen Schul-Lehrplane

Ohne Zusammenfassung     

The loss of cadmium and zinc from sea water during accumulation experiments: its implication on toxicity threshold concentrations

The loss of cadmium and zinc from solutions contained in glass and polystyrene vessels has been determined at different metal concentrations (0.2–3 μg ml^?1). A substantial amount (37%) of cadmium was lost after 15 days, while 4% zinc was lost after 50 h. In view of this metal loss, it is stressed that interpretation of graphs, calculations and deductions cannot be made on the basis of spiking amounts alone. It is also suggested that in accumulation experiments use should be made of precontaminated apparatus and the fate of metals for each experiment must be monitored separately. These precautions were omitted in 62% of all papers dealing with metal pollution published by one serious biological journal in 1979. This greatly reduces the value of the reported results and conclusions. Similarly, many earlier papers and reviews reporting acute toxicity concentrations should be viewed with extreme caution.     

Quantitative analysis of residual fuel oil in sediment samples by absorption spectrophotometry

The ultraviolet spectra of samples of an oil pollutant and crude oil at various concentrations were examined. Strong absorption maxima appear at approximately 228 nm and 256 nm. These permit a quantitative analysis in polluted sediment samples many months after the spill. Results obtained from three visits to an oil polluted beach on the South coast of South Africa are reported.     

Finnlands Präkambrium

Ohne Zusammenfassung