Photolytic method for destruction of dioxins in liquid laboratory waste and identification of the photoproducts from 2,3,7,8-TCDD
Analytical and other research laboratories that generate small volumes of dioxin-containing wastes have no convenient method for their disposal. The authors have used ultraviolet photolysis with a low-pressure mercury lamp to destroy dioxin-like compounds, both as individual congeners and in actual waste analytical samples, down to nondetect levels. Photolysis promises to be an efficient, safe, and inexpensive method for on-site treatment of liquid laboratory wastes that are contaminated by dioxin-like compounds, allowing the treated materials to be discarded as regular organic solvent waste. Experiments with 1,6-[{sup 3}H]-2,3,7,8-TCDD revealed that the principal photolytic pathway involves cleavage of C-O bonds rather than C-Cl bonds, giving chlorinated hydroxydiphenyl ethers as the initial products and accounting for the low material balances of reductive dechlorination products previously found upon photolysis of PCDDs. The photolysis products from 2,3,7,8-TCDD do not bind to either the Ah receptor or the estrogen receptor in vitro, making it unlikely that the products from UV treatment of PCDD/PCDF in laboratory waste will show either Ah or estrogen receptor-mediated toxicological effects.
- Research Organization:
- Univ. of Guelph, Ontario (CA)
- OSTI ID:
- 20014623
- Journal Information:
- Environmental Science and Technology, Vol. 34, Issue 1; Other Information: PBD: 1 Jan 2000; ISSN 0013-936X
- Country of Publication:
- United States
- Language:
- English
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