solid material senk into the organic phese, and liuuid fallout remained in the zqueous phase. The Aerosol OT, a wetting agent, was used to lower the interfaetal tension thereby permitting the solid particles to descend into the chlorobenzene solution. Versene is an agent used to preferentially complex any cations in the aqueous phase and to limit any distribution of the cations between the two chases, Carbon tetrachloride was used to minimize gmulsification in the chlorobenzene. & beg ef desiccant w2s placed in the chlorobenzene sclution to absorb any moisture present in the organic phase, (Fiz. 3.3) proo¥s [.. b . i . 4 a > y a ae Fig. 3.3 ~ . ~, eae. "Oe ae “Fel le 7 _ ad Interior of Two-Fhase Collector with Chlorobenzene and Desiccant in Place Since the efficiency of tha collector was dependent upon the concentration of the wetting agent and complexing agent, a reservoir was mounted on the side of the collector to counteract the diluticn of the aquecus phase by anyrainfall thet might occur during the col- lection period. This second container was equipped with a 4 1/2-in diameter funnel to which a condom wis connected inside the container. If the rain fell into the collector, a compzrable emount fell into the funnel, thereby swelling the condom. This would displace a 16 per cent Aerosol, ‘+ p=r cent Versene solution from the container into the collector, thus keening the cricinal concentrations in the aqueous phase constant. The mouth of the funrel was exposed only when the cover of the collector was cpen, 18 SECRET — RESTRICTED DATA