Sediments study of Lake Martignano

The aim of this research is to determine heavy metal concentration and thei r different chemical species in sediments of Lake Martignano, in different periods of the year and in the different sediment layers. Initially we cons idered twelve stations situated along a transept, then the experimentation was carried out on three stations located at different depths. It's possibl e to observe a trend, particularly for manganese, to accumulate in the deep er zone of the lake. Most of the elements are present as stable species ind icating that the take Martignano is an unpolluted environment; manganese is present overall in mobile form. This high level of mobile manganese depend s on redox potential conditions, so MnO2 can be reduced and solubilized. No ticeable seasonal variations are not observed, except for manganese in cent ral zone of the lake. The variations observed for manganese can be attribut able to an imperfect correspondence of sampling point rather than a seasona l phenomenon.