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Receiued for reuieu, January 9, 1978. Acceptpd JarzLcury 12, 1979. 7‘hi.s stud)’ u~assupported b> the Baltimore Gas and Electric Cornpun), Baltimore, Md. Contribution No. 10 o f t h e Oyster House Pithlishing Institute and Scientific Society o/ Estuaririp Research
Filtration Studies with Neutron-Activated Coal Fly Ash Gerald L. Fisher*, David Silberman, and Bruce A. Prentice Radiobiology Laboratory, University o f California, Davis, Calif. 95616
Robert E. Heft and John M. Ondov Lawrence Liverinore Laboratory, University of California, Livermore, Calif. 94550
Filtration studies were undertaken to further describe the physical and chemical properties of a size-classified, stackcollected fly ash fraction. Neutron-activated fly ash samples were dispersed in an aqueous buffer solution at physiological pH and filtered ,after a 6-min mixing period through nuclepore membranes with pore sizes of 5,2,0.8,0.4,0.2,0.1,0.05,and 0.03 pm. The ellements Mo, Ca, Se, Ba, Na, and Co were partially soluble in the buffer, and their concentrations in the filtrates apparently did not depend on membrane pore sizes. T h e elements K , Sc, Fe, Ce, Sm, Eu, T h , and U displayed filtrate concentrations that were dependent on pore size. A combination of partial solubility and pore-size dependency was observed for Sb, As, Zn, W, and Cr. The elements Zr, Cs, Nd, Rb, T b , Yb, Hf, and T a were not detected in the filtrates. These studies indicate that (a) the elements Mo, Ca, Se, Ba, Na, Co, Sb, As, Zn, W, and Cr are relatively soluble a t physiological pH, (b) a relatively large proportion of the mass of the elements Sb, As, Zn, W, U, and Cr is associated with particles of
