GEOCHEMICAL TRENDS IN SEDIMENTS FROM 13 ITALIAN SUBALPINE LAKES
Twenty-two selected cores from 13 lakes of the subalpine region of northern Italy were collected and analyzed for nutrient (carbon(C), nitrogen(N), phosphorus(P), photosynthetic pigments) and trace element (Cd, Cr, Cu, Hg, Pb, Zn) distributions. The enrichment factors for nutrients, determined by "137"Cs activity in the sediment profiles, ranged typically from one to three and can be as high as six in the heavily eutrophicated lakes. About 80% of the lakes present a considerable or high degree of contamination, and pollution is most noticeable since 1974. There are considerable enrichment factors for Cd (Lake Lugano/Ponte Tresa basin), Hg (Lake Como/Como basin), Zn (Lake Garda/Desenzano basin), and Cd (Lake Garda/Peschiera). Over the last 30 years, the impact of human activities has been most serious in lakes Annone Ouest, Segrino, Monate, and Annone Est. A modified sedimentologic approach (Haa kanson, 1980) has been applied to estimate the risk factors for trace elements in each lake. Thus, it is possible to establish priorities in aquatic pollution control programs, focussing the attention on those elements that show the highest risk factors.
Bibliographic Reference: SEDIMENTS AND WATER INTERACTIONS, PUBL. 1986, BY: SPRINGER-VERLAG, HEIDELBERG, D
Record Number: 1989126075400 / Last updated on: 1989-05-01
Available languages: en