HEAVY METAL INVENTORY AND SPATIAL VARIABILITY STUDY OF AN AQUATIC ECOSYSTEM
In view of the establishment of a heavy metal dispersion model to be applied to freshwater ecosystems, a lake - river test site has been selected, which offers ample opportunities to verify experimentally the mathematical model. The test site (a sub-system of lake Maggiore, Italy) has been exposed to industrial waste water discharge for many years and preliminary studies revealed the presence of appreciable amounts of metals such as Cd, Cu, Cr, Ni, Zn, Ag and Au. In order to design correctly the sampling station grid and the sampling frequencies in view of the establishment of the model data base, it was decided to perform a spatial and temporal metal variability study. The test site consists of a sub-basin of southern Lake Maggiore fed by three rivers. Sediments, water, suspended matter and submerged macrophytes, which serve as biological monitoring systems for trace metals in water, have been analyzed for a number of trace elements of both anthropogenic and geochemical nature, such as As, Hg, Cd, Pd, Cu, Cr, Ni, Fe, Mn, P, Cs, Rb, Se, Co, Ag and Mo as well as anions such as NO**/3-, SO**2/4-**-, F and C1. Methods used were neutron activation analysis, inductively coupled plasma emission spectroscopy, electrothermal atomic absorption spectroscopy, x-ray fluorescence spectroscopy, ZEEMAN-solid sample atomic absorption spectroscopy, ion-chromatography and differential pulse anodic stripping voltammetry. Metal distribution patterns along the rivers and in the lake and element correlations are presented, and a total metal inventory of the ecosystem and a first estimate of the related metal input rates by the rivers calculated.
Bibliographic Reference: INTERNATIONAL CONFERENCE "HEAVY METALS IN THE ENVIRONMENT", ATHENS (GREECE), SEPT. 10-13, 1985 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 32011 ORA
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Record Number: 1989124134500 / Last updated on: 1987-01-01
Available languages: en