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Title (Primary) A contribution to the study of the heavy-metal and nutritional element status of some lakes in the southern Andes of Patagonia (Argentina)
Author Markert, B.; Pedrozo, F.; Geller, W.; Friese, K.; Korhammer, S.; Baffico, G.; Díaz, M.; Wölfl, S.;
Journal Science of the Total Environment
Year 1997
Department SEEFO; GM;
Volume 206
Issue 1
Language englisch;
Abstract

Various nutrients and chemical elements, as well as other parameters, were to be measured by different methods in water and plankton samples from three Argentinian lakes in the Andes: Lake Nahuel Huapi, Lake Gutierrez and Lake Mascardi. The quality of the instrumental measurements was controlled by independent methods (TXRF and ICP/MS) and by using reference materials (NIST 1643c and BCR/CRM 414). All the chemical concentrations were very low, which means that all the lakes can be classified as oligotrophic to ultra-oligotrophic. Slightly increased concentrations within the lakes investigated may be attributed to anthropogenic influences from the town of Bariloche in the case of Lake Nahuel Huapi or to the glacial influence of the Upper Manso River, which carries considerable amounts of dissolved salts and suspended particles from the Tronador glacier. The waters are very dilute solutions dominated by calcium, bicarbonates and dissolved silica. The ionic composition is largely below the world average given by Livingstone (1963, in: Horne Al, Goldman CR. Limnology, 2nd ed. USA: McGraw Hill, 1994:576). The Andean-Patagonian lake waters showed concentrations of Cr, Sr, Zn, Cu, Co and Pb that were of the same order as the freshwater world average. The remaining elements (P, S, Si, Fe, Mn, Ni, Na, K, Mg, Ca, As, Cl and Cd) fall below or around the limit for the freshwater world average. With the exception of calcium, which is twice as high as in reference freshwater (Markert B. Inorganic chemical fingerprinting of the environment; reference freshwater, a useful tool for comparison and harmonization of analytical data in freshwater chemistry. Fresenius' Z Anal Chem 1994;349:697-702), the element concentrations (S, Fe, Mg, Na, K and Sr) are lower than in reference freshwater. The phytoplankton biomass was mainly dominated by Dinophyceae in Mascardi and Gutierrez lakes and by Bacillariophyceae in Lake Nahuel Huapi. The phytoplankton shows greater accumulation of the minerals K and Ca, and the essential trace elements (Mg, Fe, Cu and Zn) than the zooplankton. Sulphur occurs in greater concentrations in zooplankton than in phytoplankton, this could be due to higher protein contents. In the case of non-essential elements that are toxic at higher concentrations (As and Pb) it is noticeable that the levels are similar for phyto-and zooplankton. This indicates that these substances are taken up passively from the water and deposited in the organism. In general it can be said that the organisms accumulate all the elements by 100- to 1000-fold in relation of the surrounding environment.
ID 9470
Persistent UFZ Identifier https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=9470
Markert, B., Pedrozo, F., Geller, W., Friese, K., Korhammer, S., Baffico, G., Díaz, M., Wölfl, S. (1997):
A contribution to the study of the heavy-metal and nutritional element status of some lakes in the southern Andes of Patagonia (Argentina)
Sci. Total Environ. 206 (1), 1 - 15