with a given amount of mixed fission products to determine what the 
general shift in ecology will ue There are difficulties with 
mixed fission products, however, for as soon as the volume in which 
they are placed is delimited they tend to accumulate on the walls. 
Most of the isotopes of importance in disposal are present in sea 
water as radiocolloids; these are strongly adsorbed by any available 
surface. In the sea the available surface is largely organisms, but 
in a defined laboratory system the available surface is mostly the 
enclosing ia The next possibility is to use a small sized 
ocean like the Caribbean or the Mediterranean, for it would not be 
(16) 
feasible to mark out for study some volume in the open ocean. 
Practical Experience with Acid Iron Wastes. 
A barge load of liquid acid-iron wastes was discharged in 
surface waters under expeeineneal conditions to determine whether or 
not the wastes had a detrimental effect on the waters. The total 
quantity of waste, 3000 tons of a solution of ferrous sulfate in 
sulfuric acid, was discharged in a single operation. The waste had 
about 300 tons of sulfuric acid and about 300 tons of ferrous sulfate 
in the one load; the density was 1.25. A dilution of one part waste 
to 1000 parts water makes it the same density as sea water. This 
dilution of 1:1000 occurred within a few hundred yards of the disposal 
barge. It was not possible to distinguish the difference between 
the turbulence due to the passing of the barge and the normal surface 
water turbulence, With the accuracy of the iron analysis employed, 
it was possible to trace the wastes to a dilution of 108, At one time 
a spotting plane was used and the men were able to trace the wastes 
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