solid material senk into the organic phase, and liguid fallout remained in the aqueous phase. The Aerosol OT, a wetting agent, was used to lower the interfacial 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 mininize emulsification in the chlorobenzene. & beg of desiccant was placed in the chlorobenzene solution to absorb any moisture present in the orgenie phase. (F1z. 3.3) Fig. 3.3 Interior of Two-Fhase Collector with Chlorobenzene ‘ and Desiccant in Place Since the efficiency of the 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 idiluticn of the aqueous phase by anyrainfall thet might occur during the col-~ lection period. This second container was equipped with a & 1/2-in diameter funnel to which a condom was connected inside the container. If the rain fell into the collector, a comparable amount fell into the funnel, thereby swelling the condom. This would displace a 16 per cent Aerosol, '+ per cent Versene solution from the container into the col- lector, thus keeping the oricinal concentrations in the aqueous phase constant. The mouth of the funnel was exposed only when the cover of the collector was open. 18 SECRET — RESTRICTED DATA