Document ykK189nzryMmJE1MD3wxGZY4

Monsanto FHC'fc' i NAME A LOCATION, M. A. Terpstra - St. Louis, Q2E D*.T SUBJECT . May 23, 1977 . MCB & REFINED ODCB IMPURITIES RE'CRENCE Memo MAT to FB, 5/6/77 tO : F. Basile 1740 D. P. Alt - 1740 H. C. Carder - E1SF C. Dobbins - F4EF F. J. Helmer - 1740 R. G. Kaley - T2B W. B. Papageorge - E3NJ M. A. Pierle - ElJF W. R. Richard - R2E C. C. Sisler - R2E Results of Items 4 and 5 of reference memo are given below plus oxychlor MCB: Material (ppm) WGK NB225596 NB1066129 NB225599 MCB Oxy-Chloro Lab.Refined NB9520205 NB1065641 PPG QH30354 NB225599 Dow MM03266 NB225599 ODCB PPG-99% For DCNB GATX97749 NB1066130 ChioroBiphenyl Monochloro Diehloro Trichloro Tetrachloro 8.5 0.2 ND <0.1 ND <0.1 0.6 ND <0.05 ND <0.05 ND <0.05 25 0.07 ND <0.05 ND <0.05 15 0.06 ND <0.05 ND <0.05 ND <0.05 5.6 0.08 The following suggestions were received: 1. Pierle - Check NCB residues for PCB's or nitrated PCB's. 2. Burke - Check benzene from 3 suppliers for biphenyls. 3. I have requested that Applied Science make certain that PCB's are not formed in the instrument. Samples of the MCB process were received 5/23 and will be run as soon as possible. /pam tra IN - tO REV. t 72 DSW 297825 STLCOPCB4067736