The sources of alkalinity in Lake Miklavatn, north Iceland
Lake Miklavatn, north Iceland, is highly stratified with an 8–9‐m layer of freshwater overlying saline and anoxic deeper water. Sulfide and ammonia concentrations are high in the stagnant and saline layer, and titration alkalinity exceeds conservative alkalinity in the deepest part of the lake by a...
| Published in: | Limnology and Oceanography |
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| Main Authors: | , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Wiley
1983
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| Subjects: | |
| Online Access: | http://dx.doi.org/10.4319/lo.1983.28.1.0050 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.1983.28.1.0050 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.1983.28.1.0050 |
| Summary: | Lake Miklavatn, north Iceland, is highly stratified with an 8–9‐m layer of freshwater overlying saline and anoxic deeper water. Sulfide and ammonia concentrations are high in the stagnant and saline layer, and titration alkalinity exceeds conservative alkalinity in the deepest part of the lake by a factor of 3–4. Reduction of sulfate was estimated by direct measurement of the sulfate concentration. With one exception the decrease in sulfate was found to exceed the measured sulfide concentration. This is explained by partial oxidation of sulfide due to mixing with oxygenated water from the upper layer. The excess alkalinity is 92–93% accounted for by sulfate reduction and formation of ammonia, whereas excess metal carbonates do not seem to be a source. |
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