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Radium-226 and Alkaline Earth Elements in the Water Column, Interstitial Sediment Water, and Sediments of Zürichsee (Switzerland)

R. N. Moser ; Laboratorium für Radiochemie, Universität Bern, CH-3000 Bern-9, Switzerland
H. R. von Gunten ; Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
U. Zimmermann ; Wasserversorgung Zürich, Hardhof 9, CH-8023 Zürich, Switzerland

Sažetak

Distribution of alkaline earth elements Mg, Ca, Sr, Ba and Ra (226Ra) was measured in the water column and in the sediments (solids and interstitial water) of Zürichsee (Lake Zurich), Switzerland. With the exception of Ra, the concentrations of alkaline earth elements were always quite uniformly distributed throughout the water column and did not show seasonal variations. Our results indicate removal of Ra from the water column in winter, probably due to scavenging effects during the turnover period of the lake. Furthermore, during the lake stagnation in summer, the concentrations of Ra (and to a lesser extent of Ba) increased in the bottom layer of the water column. We postulate that the increase in the concentrations of these elements during stagnation results from their release from the sediments together with Mn when the sediments and the interstitial water become more anoxic. Ra and Ba were found to be enriched in the interstitial water of the sediments. Their concentrations in solid sediments decreased with increasing sediment depth and showed a sediment distribution pattern resembling that of manganese.

Ključne riječi

Hrčak ID:

132353

URI

https://hrcak.srce.hr/132353

Datum izdavanja:

4.5.1998.

Posjeta: 539 *