Ad. Konstantinov et al., Photolytic method for destruction of dioxins in liquid laboratory waste and identification of the photoproducts from 2.3.7,8-TCDD, ENV SCI TEC, 34(1), 2000, pp. 143-148
Citations number
37
Categorie Soggetti
Environment/Ecology,"Environmental Engineering & Energy
Analytical and other research laboratories that generate small volumes of d
ioxin-containing wastes have no convenient method for their disposal. We ha
ve used ultraviolet photolysis with a low-pressure mercury lamp to destroy
dioxin-like compounds, both as individual congeners and in actual waste ana
lytical samples, down to nondetect levels. Photolysis promises to be an eff
icient, safe, and inexpensive method for on-site treatment of liquid labora
tory wastes that are contaminated by dioxin-like compounds, allowing the tr
eated materials to be discarded as regular organic solvent waste. Experimen
ts with 1,6-[H-3]-2,3,7,8-TCDD revealed that the principal photolytic pathw
ay involves cleavage of C-O bonds rather than C-Cl bonds, giving chlorinate
d hydroxydiphenyl ethers as the initial products and accounting for the low
material balances of reductive dechlorination products previously found up
on photolysis of PCDDs. The photolysis products from 2,3,7,8-TCDD do not bi
nd to either the Ah receptor or the estrogen receptor in vitro, making it u
nlikely that the products from UV treatment of PCDD/PCDF in laboratory wast
e will show either Ah or estrogen receptor-mediated toxicological effects.