Document jyjL4eEnbXJeEDeNrmD36LbXQ

4 ,4'-Thiodiphenol (TOP) 4 ,4'-SuIfonyidiphenol (SDP) Crown Zellerbach has developed considerable expertise in manufac turing symmetrical tliiobis aromatic compounds. We now produce 4 , 4'-thiodiphenol (TDP) and 4 ,4 'sulfomidipnenol (SDP) in commercial quantities. But other thiobis (aromatic) samples and literature. Just pick up your telephone any business day between 8 a.m. and 5 p.nt. Pacific time and Dial-A-Chemist, toll-free. Crown Zellerbach, Chenu cal Prod uces Division, P.O. Box 4266, Vancouver, compounds are possible and could be produced on a custom basts in existing equipment. If you have questions about these chemicals, or any new thio, sulfinjl or sulfomi bis compounds, we have an swers. And also TDP and SDP Crom i Zellerbach. Helping take 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 20.0iJd-gal. spil of orLhochlorophenol in Siu:gvuii, Mu., last January have been found to have low levels of Tt'.on (2.3.7.8-U'lrnchlorndiln'ti?.o-prmi-dioxin) in their blood, according to the Environmental Proleclion Agen cy. The highly toxic d ioxin -a contami nant of orthochlorophenol --has so far caused no adverse health .effects in the workers. The orthochlorophenol was en route from Monsanto 10 a cusiomcr on Janu ary 10 when the Norfolk Western tank car carrying it derailed in Sturgeon. "Quite a cloud of obnoxious gas" was* released, F.PA says, and forced lenipnrnrv evacuation of most of Sturgeon's -..fj resident's. 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 trackbed. 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 epa that its orthochlorophenol ship ment contained 27 parts per billion if TCDI), although the company said it was not possible to determine whether the dioxin was the highly toxic 2,2,7,S isomer of tcdd. ( epa 's own later analysis of the ortho from several laboratories con firmed the presence of the 2,2.7.8 tenn isomer, officials report.J The live work ers contaminated with ortliochlorophe.nol were then tested for dioxin. One worker who reportedly disre garded safety procedures and let his hands come in contact with the ortho chlorophenol has approximately 21 parts per trillion of 2.2,7,S rrnn in his hlood, epa 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, epa oilicials are unsure whether the workers' levels are cause, for concern. "We don't know if they're high or low, hut I would guess there's no toxicological significance," said Dr. Jo seph Soiftcr, an epa physician, especially because there have been no adverse health effects thus far. But the workers will still be monitored, he added. C0047S