Formation of freshwater Fe-Mn coatings on gravel and the behavior of 60 Co, 90 Sr, and 137 Cs in a small watershed

Details Formation of freshwater Fe-Mn coatings on gravel and the behavior of 60 Co, 90 Sr, and 137 Cs in a small watershed Formation of freshwater Fe-Mn coatings on gravel and the behavior of 60 Co, 90 Sr, and 137 Cs in a small watershed

Aug 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982gecoa..46.1333c&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 46, Issue 8, pp.1333-1343

Computer Science

2

Scientific paper

Iron and manganese oxide coatings are actively forming on stream substrates in the White Oak Creek watershed in East Tennessee. Although oxidizing conditions are required for Fe-Mn oxide precipitation, coatings accumulate only if dissolved iron and manganese exceed 50 g/L. Below this, coatings are lost by abrasion as fast as or faster than they form. Annual rates of formation of 3 mg/g on substrate (gravel) were observed. Manganese is dissolved from coatings between Eh values of 100 to 300 mV and below 1 mg/L dissolved O 2 at pH 6.5 to 7.5. Iron oxides can be precipitated under these conditions. Uncontaminated gravels with oxide coatings (composed of illite, quartz, and feldspar) adsorbed radionuclides rapidly from waters below MPC (Maximum Permissible Concentration) levels. Contaminated gravels placed in uncontaminated waters lost 60 Co by abrasion in oxidizing conditions and by dissolution of manganese coatings in reducing conditions. Exchangeable 90 Sr was completely lost after one month whereas nonexchangeable 90 Sr was lost more slowly; 137 Cs was totally retained by the gravels. Gravels such as these can be used to monitor the radionuclide content of waters in the environment.

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