INVESTIGADORES
MASSAFERRO Julieta
artículos
Título:
HEAVY METAL CONTAMINATION IN SEDIMENTS OF LAKE NAHUEL HUAPI, NAHUEL HUAPI NATIONAL PARK, NORTHERN PATAGONIA, ARGENTINA
Autor/es:
RIBEIRO GUEVARA; MASSAFERRO; ARRIBERE; VILLAROSA; RIZZO
Revista:
WATER AIR AND SOIL POLLUTION
Editorial:
SPRINGER
Referencias:
Lugar: Berlin; Año: 2002 vol. 18 p. 34 - 39
ISSN:
0049-6979
Resumen:
Abstract. Trace metals (Sb, As, Br, Cs, Co, Cr, Ag and Hg), rare earth elements (Ce, Eu, La, Lu,
Sm, Tb and Yb), and Sc. were analysed in suspended load and in two sediment cores from Lake
Nahuel Huapi, Nahuel Huapi National Park, Patagonia, Argentina, by using Instrumental Neutron
Activation Analysis. The core activity profiles of 210Pb and 137Cs were measured to estimate the
age of the sediments. Silver was enriched in the upper layers of both cores, and correlated with the
strong growth of the population of Bariloche City in the last 50 yr. Concentrations are higher in the
core sampled near Bariloche, and indicate some transport in the water body. Silver concentrations
measured in the suspended load were 4.58±0.36 and 3.46±0.40 µg g−1 in the southern margin
of the lake, near San Carlos de Bariloche City, whereas in the northern margin the concentrations
were 1.68±0.18 and 1.88±0.23 µg g−1. Concentration ratio for silver in suspended load and upper
core layers were equal in both sampling points. These facts suggest that Ag contents correspond to
inputs associated with human activities. Bromine concentrations show a strong increase above base
line values, similar to silver. In contrast, caesium, chromium, and cobalt concentrations do not differ
from base line values. The metalloids antimony and arsenic show little variation with regard to base
line concentration. Noticeable, the mercury contents found in the suspended load.