Document byQZB2MNVdzxDmYvo7R578vRo

r Se' INTERNATIONAL LEAD ZINC RESEARCH ORGANIZATION, INC. 292 M ADISON AVENUE, NEW YORK, N.Y. 10017 TELEPHON E >32-23 7 3 (AREA COOE 212) CABLE ADDRESS: N YILZRO NEW YORK July 9, 1970 Dr. Robert A. Kehoe The University of Cincinnati Kettering Lab. College of Medicine Eden Avenue Cincinnati, Ohio ^5219 Lear Dr. Kehoe: IH-loO Effect of Particle Size on the Absorption of Lead in Humans LH-75 Hunan Exposure to Particulate Lead Compounds in the Air Under Experimental Conditions In looking over your recent report on LH-160 I note that the technique used to achieve the dispersion of 0.5 micron lead sesquioxiae particles is not mentioned. This was a matter of some discussion in our meeting last autumn when the ILSRO Environmental Health Committee originally considered this work. It would be helpful to me if you could send me a description of the technique which I may attach to the report. On another natter, could you give me an indication of the date when we might expect a final report on the previous experiments envolving ex posure to 10 and 20 micrograms per cubic meter of air? As you know, iJAPCA is now in the process of preparing the Air Quality Criteria Doc ument for lead. The data obtai. nea in your previous work and your in terpretation of them are critical and should be considered prior to the publication of the Document. Manager, Environmental Health JEC:ls ft n0n48^7