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| Content Provider | Springer Nature Link |
|---|---|
| Author | Wu, F. C. Qing, H. R. Wan, G. J. Tang, D. G. Huang, R. G. Cal, Y. R. |
| Copyright Year | 1997 |
| Abstract | Sediments were cored, and the sediment-water interface and overlying waters were sampled in 5 lakes from the southwestern Chinese plateau during 1991-95. The geochemistry of HCO$_{3}$ $^{−}$ at the sediment-water interface was examined by studying detailed profiles of pH, HCO$_{3}$ $^{−}$ concentrations and 813C of dissolved inorganic carbon (DIC) in overlying lake water and porcwater near the sediment-water interface. Dissolution-precipitation equilibrium of carbonates, diffusion flux, and the extent of the influence of diffusion on the whole lake were calculated. The results show that the HCO$_{3}$ $^{−}$ near the interface carried isotopic characteristics of decomposition of organic matter during early diagenesis, and that the porcwater in surface sediments was unsaturated relative to calcite, and gradually saturated with depth. Furthermore, the interface is a source of HCO$_{3}$ to the overlying water. Alkalinity (Alk) diffusion flux from sediments to the overlying water due to concentration gradients ranged front 0.51 to 24.33 × 10$^{4}$ mol cm$^{−2}$ a$^{−1}$. The calculated contribution of the diffusion of Alk to the overlying water ranged from 0.46% to 49.42%. Diffusion is an important source of Alk in lakes with a long residence time and a relatively shallow depth. |
| Starting Page | 381 |
| Ending Page | 389 |
| Page Count | 9 |
| File Format | |
| ISSN | 00496979 |
| Journal | Water, Air, and Soil Pollution |
| Volume Number | 99 |
| Issue Number | 1-4 |
| e-ISSN | 15732932 |
| Language | English |
| Publisher | Kluwer Academic Publishers |
| Publisher Date | 1997-01-01 |
| Publisher Place | Dordrecht |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | diffusion alkalinity sediment-water interface southwestern Chinese plateau carbonates carbon isotopes Hydrogeology Environment Atmospheric Protection/Air Quality Control/Air Pollution Terrestrial Pollution Waste Water Technology Water Pollution Control Water Management Aquatic Pollution |
| Content Type | Text |
| Resource Type | Article |
| Subject | Ecological Modeling Environmental Chemistry Pollution Environmental Engineering Water Science and Technology |
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