Physics
Scientific paper
Oct 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54.2635v&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 54, Issue 10, pp.2635-2644
Physics
Scientific paper
Observations on the removal of radioactive and stable Fe in experimental limnocorrals were used to test different sediment-water exchange models. The removal of 59 Fe from the water column was rapid (10-15% day -1 ) but relatively insensitive to particle concentration. Radioactive and stable Fe were more concentrated on suspended particles than on settling particles caught by sediment traps. Also, the distribution coefficient of stable Fe (K D ) was higher in the water column than in the bottom sediments. Modelling of 59 Fe dynamics shows that (1) adsorption of non-filterable (dissolved and colloidal) Fe onto filterable particles was basically instantaneous at the natural suspended particle concentrations encountered in our experiments, (2) the removal rate of Fe from the water column of the lake depends on the coagulation rate of non-settling filterable particles into settling particles, and (3 ) non-settling particles sorb Fe more strongly than settling particles. The model developed and tested using short-term 59 Fe tracer experiments simulated the distribution of stable Fe between the water column and the sediments despite the different distributions of stable Fe and 59 Fe and the different time scales of processes that could influence the behaviour of the isotopes.
Cornett J. J. R.
Vezina A. F.
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