| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 4436027 | Applied Geochemistry | 2013 | 13 Pages |
•Temporal changes in As concentration of surface waters were observed in some areas of the Czech Republic.•Mobilized As originates from atmospheric deposition in the past.•We monitored chemistry and runoff generation of brooks and springs in the Elbe River catchment.•We follow the interactions of dissolved organic matter (DOM) and Fe with temporal trends of As in stream waters.
Temporal changes of As concentration in surface waters were observed in some areas of the Czech Republic. Mobilized As originates from past atmospheric deposition. To understand the factors influencing As aqueous concentration and mobility the chemistry and runoff generation of a number of brooks, springs and rivers in the central part of the Elbe River catchment, Czech Republic, were monitored. Seasonal variations of As (from 0.5 to 10.5 μg L−1), Fe (from 0.05 to 3.9 mg L−1) and DOC (dissolved organic C – from 1.2 to 17.5 mg L−1) were observed in monitored stream waters with maximum values of As and Fe in the summer months at pH values 7.6–7.8. The concentration of As in particles with a diameter < 60 μm correlates with the Fe concentration. There is no correlation between Fe and As in filtered samples (<0.45 μm). The As concentration in stream water colloids depends on an increase in DOC concentration and a decrease in ionic strength. The DOC stabilizes As in solution and reduces its re-adsorption on Fe colloids and consequently As concentration in the stream increases.
