River Water Quality of the Selenga-Baikal Basin: Part II—Metal Partitioning under Different Hydroclimatic Conditions
| Autor: | Margarita Pashkina, Josefin Thorslund, Mikhail Lychagin, Nikolay Kasimov, Sergey Chalov, Jerker Jarsjö, Galina Shinkareva |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Hydrology
lcsh:TD201-500 water pollution geography lcsh:Hydraulic engineering geography.geographical_feature_category Flood myth Range (biology) Geography Planning and Development Drainage basin Aquatic Science Structural basin Particulates Biochemistry Suspension (chemistry) aquatic geochemistry lcsh:Water supply for domestic and industrial purposes lcsh:TC1-978 metal partitioning the Selenga River basin Environmental science Metalloid Lake Baikal Water pollution Water Science and Technology |
| Zdroj: | Water Volume 12 Issue 9 Water, Vol 12, Iss 2392, p 2392 (2020) |
| ISSN: | 2073-4441 |
| DOI: | 10.3390/w12092392 |
| Popis: | The partitioning of metals and metalloids between their dissolved and suspended forms in river systems largely governs their mobility and bioavailability. However, most of the existing knowledge about catchment-scale metal partitioning in river systems is based on a limited number of observation points, which is not sufficient to characterize the complexity of large river systems. Here we present an extensive field-based dataset, composed of multi-year data from over 100 monitoring locations distributed over the large, transboundary Selenga River basin (of Russia and Mongolia), sampled during different hydrological seasons. The aim is to investigate on the basin scale, the influence of different hydroclimatic conditions on metal partitioning and transport. Our results showed that the investigated metals exhibited a wide range of different behaviors. Some metals were mostly found in the dissolved form (84&ndash 96% of Mo, U, B, and Sb on an average), whereas many others predominantly existed in suspension (66&ndash 87% of Al, Fe, Mn, Pb, Co, and Bi). Nevertheless, our results also showed a consistently increasing share of metals in dissolved form as the metals were transported to the downstream parts of the basin, closer to the Lake Baikal. Under high discharge conditions (including floods), metal transport by suspended particulate matter was significantly greater (about 2&ndash 6 times). However, since high and low water conditions could prevail simultaneously at a given point of time within the large river basin, e.g., as a result of on-going flood propagation, snap-shot observations of metal partitioning demonstrated contrasting patterns with domination of both particulate and dissolved phases in different parts of the basin. Such heterogeneity of metal partitioning is likely to be found in many large river systems. These results point out the importance of looking into different hydroclimatic conditions across space and time, both for management purposes and contaminant modeling efforts at the basin scale. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|