The coagulation of dissolved 239, 240Pu in estuaries as determined from a mixing experiment

Details The coagulation of dissolved 239, 240Pu in estuaries as determined from a mixing experiment The coagulation of dissolved 239, 240Pu in estuaries as determined from a mixing experiment

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983e%26psl..64..437s&link_type=abstract

Earth and Planetary Science Letters, Volume 64, Issue 3, p. 437-444.

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A mixing experiment, using large volumes (100 l) of filtered (< 1 μm) freshwater and seawater end-members, was performed to simulate and investigate the chemical reactivity of 239, 240Pu during estuarine mixing. An organic-rich freshwater with a relatively high concentration (0.8 dpm/100 l) of dissolved 239, 240Pu was used as one end-member; Buzzards Bay seawater (dissolved 239, 240Pu = 0.04 dpm/100 l) was the other. The results demonstrate that dissolved 239, 240Pu in the freshwater undergoes extensive and rapid coagulation under simulated estuarine conditions. There is a strong correlation between the amount of coagulation of dissolved 239, 240Pu, humic acids (HA), and Fe. The extent of coagulation of all three constituents increases with increasing salinity and the net extent of their removal is 53%, 57%, and 100% for Pu, HA, and Fe respectively. As has been documented for Fe in freshwater, dissolved 239, 240Pu appears to be stabilized by naturally occurring humic substances to form negatively charged colloids which are then coagulated by seawater cations. The extrapolation of these experimental results to real estuaries will require additional research.

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