32 6
(I~O~CI
CI~O~CI
2,3,7,8-TCDD (III)
CI
CI~O~CI
)Q(
a
o
CI
CI
l,2,3,6,7,8-HxCDD (V)
Fig. 14.2. Congeners (isomers) of PCDDs and PCDFs
Fig. 14.3. Polyvinylchloride
(PVC)
(I
I
OH
CI/
'(
CI
(VIII)
CI
~
O(H 2 COOH
/"
- 2 (I(H 2 COOH
( I / T
(I
(IX)
V. S. Petrosyan
CI
CI
CI
CI
(I
2,3A,7,8-PeCDF (IV)
(I
CI
(I
CI
CI
(I
CI
l,2,3A,7,8,9-HpCDF (VI)
- (-(H 2 - (H(I- )n -
(VII)
:::©(°n
CI
o
(I
(III)
Fig. 14.4. Organochlorine pesticides: 2,4,5-trichlorophenol (VIII) and 2,4,5-T (IX)