Microcystin Concentrations in the Nile River Sediments and Removal of Microcystin-LR by Sediments During Batch Experiments

2007 ◽  
Vol 52 (4) ◽  
pp. 489-495 ◽  
Author(s):  
Zakaria A. Mohamed ◽  
Hassan M. El-Sharouny ◽  
Wafaa S. Ali
Keyword(s):  
River Sediments ◽  
Nile River ◽  
Batch Experiments

MONTMORILLONITIC SOILS DEVELOPED IN NILE RIVER SEDIMENTS

Soil Science ◽  
1973 ◽  
Vol 116 (3) ◽  
pp. 191-201 ◽  
Author(s):  
H. A. EL-ATTAR ◽  
M. L. JACKSON
Keyword(s):  
River Sediments ◽  
Nile River

scholarly journals Sorption and transformation of the reactive tracers resazurin and resorufin in natural river sediments

2013 ◽  
Vol 10 (10) ◽  
pp. 12187-12216 ◽  
Author(s):  
D. Lemke ◽  
R. González-Pinzón ◽  
Z. Liao ◽  
T. Wöhling ◽  
K. Osenbrück ◽  
...  
Keyword(s):  
River Sediments ◽  
Tracer Tests ◽  
Sorption Isotherms ◽  
Hyporheic Exchange ◽  
Batch Experiments ◽  
Linear Sorption ◽  
Alkaline Conditions ◽  
Kinetic Sorption ◽  
Reactive Tracers ◽  
Transient Tracer

Abstract. Resazurin (Raz) and its reaction product resorufin (Rru) have increasingly been used as reactive tracers to quantify metabolic activity and hyporheic exchange in streams. Previous works have indicated that these compounds undergo sorption in stream sediments. We present a series of laboratory column and batch experiments on Raz and Rru transport, sorption, and transformation within sediments with different physicochemical properties under neutral and alkaline conditions. The data of the column experiments were fitted by a model accounting for physical transport, equilibrium and kinetic sorption, and three first-order reactions. The most likely parameters and their uncertainty were determined by a Markov-Chain Monte Carlo approach. Linear and non-linear sorption isotherms of both compounds were obtained by batch experiments. We found that kinetic sorption dominates sorption of both Raz and Rru, with characteristic timescales of sorption in the order of > 80 min. The linear sorption models for both Raz and Rru appeared adequate for concentrations that are typically applied in field-tracer tests. The supposed two-site sorption model helps interpreting transient tracer tests using the Raz–Rru system.

Sign in / Sign up

Export Citation Format

Share Document