Physics
Scientific paper
Sep 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977gecoa..41.1313b&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 41, Issue 9, pp.1313-1324
Physics
44
Scientific paper
A survey of U.S. east coast estuaries confirms that large-scale rapid removal of iron from river water is a general phenomenon during estuarine mixing. The river-borne `dissolved' iron consists almost entirely of mixed iron oxide-organic matter colloids, of diameter less than 0.45 m, stabilized by the dissolved organic matter. Precipitation occurs on mixing because the seawater cations neutralize the negatively charged iron-bearing colloids allowing flocculation. The process has been duplicated in laboratory experiments using both natural filtered and unfiltered river water and a synthetic colloidal goethite in 0.05 m filtered water. The colloidal nature of the iron has been further confirmed by ultracentrifugation and ultrafiltration. A major consequence of the precipitation phenomena is to reduce the effective input of `dissolved' iron to the ocean by about 90% of the primary river value, equivalent to a concentration of less than 1 mol per liter of river water.
Boyle Edward A.
Edmond John M.
Sholkovitz Edward R.
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