Document ba1OLooB5rJ02qwRN1Xmkn4Kg

ir 4'-Thiodiph(MK>l (TDP) 4, 4'-Sulfon\1diphenol (SOP) TM Crown Zellcrbach has developed considerable expertise in manufac turing symmetrica] tliiobis aromatic compounds. We now produce 4 ,4,-thiodiphenoI (TDP) and 4, 4'suifomldipnenol (SDP) in commercial quantities. But other thiobis (aromatic) compounds are possible and could be produced on a custom basis in existing equipment. If you have questions about these chemicals, or any new thio. sulfimi or sulfon\1 bis compounds, we have an swers. And also TOP and SDP Croun Zellcrbach. Helping samples and literature. Just pick up \our telephone any business day between 8 a m. and 5 p.m. Pacihc ante and Dial-A-Giemist, toll-free. Crown Zellerhach. Chemical Prod ucts Division, PO. Box 4266, Vancouver, l'e the search out o f research. 22 Chemical Week/May 23. 1979 Dioxin is found in cleanup workers' blood Two professional cleanup workers who helped mop up a 20.000-;:*!. spil of orihochlorophenol in Stm^eun, Mo., last January have been found to have lowlevels of Tenn (2,3,7,K-letrachlorodilenzo-pnru-dioxin) in their hlood, according to the Environmental Protection Agen cy. The highly toxic dioxin --a contami nant of orthochlorophonol--lias so far caused no adverse health .effects in the workers. The orthochlorophcnol was en route from Monsanto io a customer on Janu ary 10 when the Norfolk & Western tank car carrying it derailed in Sturgeon. "Quite a cloud of obnoxious jjas" wasreleased. F.I'A says, and furred temporary evacuation of most of SturitoMn* -..ft residents. Cleanup workers from \\ ern Environmental Services (Portland, Ore.) --hired by the railroad --arrived the same day to contain the orthochlorophenol and eventually remove the con taminated soil from over a mile of trackhed. Although "Western Environ mental supplied full protective equip ment for all employees." according to N&W, five of the men subsequently tested showed traces of orthochloroph.nol in their urine. Monsanto later noti fied HPa that its orihochlorophenol ship ment contained 37 parts per billion if TCDD. although the company said it was not possible to determine whether the dioxin was the highly toxic 2,3,7.8 isomer of TCHD. ( k pa 's own later analysis of the ortho from several laboratories con firmed the presence of the 2.3.7.8 t<p i> isomer, officials report.) The live work ers contaminated with orthochlorophenol were then tested for dioxin. One worker who reportedly disre garded safety procedures and let his hands come in contact with the orthochlorophenol has approximately 31 parts per trillion of 2.3,7,S Trnn in his blood, HPA says. Another worker has 7 parts per trillion and N&W says it doesn't know how he could have been contami nated. Western Environmental declined comment. Because human dioxin con tamination is rarely reported in scien- tific literature, KPA officials are unsure . whether the workers' levels are cause for concern. "We don't know if they're hi^h or low, hut I would uuess there's no toxicolouical significance," said Dr. Jo seph Seiftcr, an kpa physician, especially because there have been no adverse health elTects thus far. But the workers will still be monitored, he added. C00175