Abstract
The effect of redox potential and pH on the phosphate mobility in two sediments were investigated using both consolidated and suspended sediments from the area where the Parana Medio long reservoir (Atgentina) is to be built (Smirnov, 1984). In addition to direct chemical sediment analysis, extraction techniques were carried out with a stepwise NH4Cl-NaOH-HCl shaking method, the latter supposedly separating the weakly bound, the Fe- and Al- bound and the Ca- bound phosphates in the sediments.
Phosphate released into water depends upon redox potential and pH, which both were modified in an experimental setup. The source of the phosphate was the fraction of Fe and/or Al bound phosphate present both in the sediment and in the suspended solids.
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Abbreviations
- cm:
-
centimeter
- km:
-
kilometer
- gg:
-
gram
- l:
-
liter
- ¬m:
-
micrometer
- °C:
-
grade centigrades
- km2 :
-
square kilometer
- m.s−1 :
-
meter per second
- m3.s−1 :
-
cubic meter per second
- mg.1‐1 :
-
miligram per liter
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Maine, M.A., Hammerly, J.A., Leguizamon, M.S. et al. Influence of the pH and redox potential on phosphate activity in the Parana Medio system. Hydrobiologia 228, 83–90 (1992). https://doi.org/10.1007/BF00006479
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DOI: https://doi.org/10.1007/BF00006479