Document LgjxE50rbrmpJZY45VjEXz2qd

t y "COU-I l*T. 01 ACIUtUIlVlUi W J'A U T M i.X r OJ* NUTtiVlK'SMl. CCUINCtJ i.nvjnun: or maiunk ncsovncns JiERKEf.KY, CA1 Tl'OrNI.V 9 1 7 7 0 ,N, ovem.ber 1, 1S63 pr. Robert A. Conkin Group leader Research Kcuiiwuito Chemical Company 800 North Lindbergh boulevard St. Louis, Missouri 63166 `. . Pear Pr. Conkin: t Iir. Wayne Thornburg has mentioned your Interest in the work of our laboratory vith polychlorinated biphenyls in the'global environment. Enclosed for your information are two manuscripts. The paper entitled "Chlorinated Hydrocarbons in-' Karine Ecosystems" was presented at the Rochester Conference on Chemical Fallout in June and is now in press as a chapter in the Proceedings of that conference.. O r.r:* Mcuuscri.pl entitled "Polychlorinated Biphenyls in the Global Ecosystem" is ; dvi;ft of a paper now la pte^s in KAIUKH. ' 1 would greatly appreciate any critical comments you might have on these papers. l)o you believe, for example, that there might be another source of these compounds other than your Aroclor products? We find that the concentrations of l'CD in fish and birds arc highest in industrial areas, but that the marine cuvlrorient' is now almost universally contaminated. The discovery that these cor.-pounds arc powerful inducers of live enzymes which break down steroids'will uHiuntely lead to the setting of tolerance limits in fish consumed for food. 1 would especially appreciate any suggestions you might have in assisting ur. in looking for end identifying other industrial products which, because of Ihc-ir chemical stability and non-polar character, may also be accumulated by fir.h and witldlife. * *# Sincerely yours, v (Lj2-o--^ Robert W. Risebrough NV 031150 780688 780689