Abstract

A study over the evolution of aluminium concentrations (total, filtered through 0.45 μm membranes and suspended Al) in two Spanish reservoirs has been carried out. The results obtained indicate that there are depth trends in concentrations of Al: the bigger Al levels have been found in deeper waters. During the rain periods, the suspended Al associated with silicate clays in the fresh water inputs penetrates in the reservoirs; an experimental relation between suspended Al concentrations and turbidity of natural waters is proved. After rain, the sedimentation phenomena cause decrease in suspended Al levels, whereas the level of filtered Al (majority dissolved Al) varies very little. A relation between the total Al concentration and pH can be observed in all the sampled periods (March–July 1990): the lower the pH values, the bigger the Al levels. Finally, in reservoirs under strong anaerobic conditions during their thermal stratification periods, the variations in Al are similar to those already known for iron and manganese.

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