Document XRnevnrj1jB6qL00xVd2XvLNR

UNIT1Df r ATMINVmONMlNTALPROTICITONAQBNCY WASHINGTON, D.O. 80460 GI li ( Nl'( AC| m k lO K It f; O .M f'AlCiK HAR 2 1993 WOVNrSKit)**NO TOKIO M ltT A N O I ' kxm oxavdm S ubjects 2,4-D, 2,4-DB, and 2,4-DP and Thsir Salta and Beterst Survey of Dibanzo-p-Dioxin and Dibsnzofuran Determination#. DP Bsrecds Dl88268. CBRS No* 11419*. Front Stephen Fhle, Ph.D.. Chemist Special Review saotion X Chemistry Branch XX - Raragistratien Support Health Bffacts'Division (H7509C) Throught Andrew Ratfcwan, Saotion Haad Special Review Saotion X Chemistry Branch XX r Reragiatra Health Bffacts Division (H7509C) on Support Tot J i l l Bloom Spacial Review.Branch Special Review and Reregistration.Division (H7S08) Xn Juno 1917 data call-in vas iasusd for information on tha polyhalogenated diberzo-p-dioxin and dibenzofuran contants of certain pesticidas. Tha call-in consisted of two parts* Ona part requested datteH a d manufacturing, information for those psstioidas whose structure or mode of synthesis indicated a potantial for dioxin/dibenzefuran contamination. Tha other part required tha actual analysis of certain taohnioal paaticidas for IS chlorinated dibenso-p-dloxime and dibenzofuran*. Tha latter group of paatioidas are manufactured by processes documented to' produce dioxln/dibanzofuran contaminants Included in tha list of pesticides that required analysis ware 2,4-D, 2,4-DB, 2,4-DP, and tha asters and salts of these herbicides*