Is dibenzofuran a dioxin?
Polychlorinated dibenzo-p-dioxins (PCDDs) and dibenzofurans (PCDFs) are a class of chemical compounds that are largely of anthropogenic origin. Tetrachlorodibenzo-p-dioxin (TCDD), the most toxic dioxin, also called “the most toxic man-made chemical,” has an estimated half-life of 7–11 years in humans.
What is the chemical formula of dioxin?
C4H4O2
1,4-Dioxin/Formula
Is dibenzofuran a PAH?
Although the coal tar mixtures contained 1,504 or 1,810 mg/kg of dibenzofuran, respectively, they also contained mutagenic PAHs which could have accounted for the observed lung and liver tumors (Culp et al., 1998; Goldstein et al., 1998).
Is TCDD a Pcdd?
PCDDs and PCDFs are solids at room temperature and have a rather low volatility. Dispersion in the atmosphere is thus likely to occur mainly in particulate aerosols. The most toxic and most extensively studied representative of the chlorinated dioxins (PCDDs) is 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD).
What is dibenzofuran used for?
Dibenzofuran is used as an insecticide and to make other chemicals. It is made from coal tar and has been found in coke dust, grate ash, fly ash, and flame soot.
Which PCBs are dioxin-like?
Dioxins and dioxin-like compounds
- Polychlorinated dibenzo-p-dioxins (PCDDs), or simply dioxins.
- Polychlorinated dibenzofurans (PCDFs), or furans.
- Polychlorinated biphenyls (PCBs), derived from biphenyl, of which 12 are “dioxin-like”.
- Polybrominated analogs of the above classes may have similar effects.
Is dibenzofuran aromatic?
Dibenzofuran is a heterocyclic organic compound with the chemical structure shown at right. It is an aromatic compound that has two benzene rings fused to a central furan ring.
Is dibenzofuran volatile?
It is a volatile white solid that is soluble in nonpolar organic solvents. It is obtained from coal tar, where it exists as a 1% component….Dibenzofuran.
| Names | |
|---|---|
| Chemical formula | C12H8O |
| Molar mass | 168.19 g/mol |
| Appearance | white crystalline powder |
| Melting point | 81 to 85 °C (178 to 185 °F; 354 to 358 K) |
What is the molecular weight of dibenzo p dioxin?
Dibenzo-P-dioxin PubChem CID 9216 Synonyms DIBENZO-P-DIOXIN Oxanthrene Dibenzo [b,e Molecular Weight 184.19 Date s Modify 2021-07-10 Create 2005-03-27
Where do dioxins and dibenzofurans come from?
Dioxins and dibenzofurans are created during waste incineration and are part of the released smoke stack effluent.
Where does primary hydroxylation of dibenzo-p-dioxin take place?
In rats, primary hydroxylation of dibenzo-p-dioxins takes place exclusively at 2, 3, 7, or 8 position. Dioxins were administered to rats. Urine and feces were collected and analyzed. Dibenzo-p-dioxin yielded the 2-hydroxy analog, one methylthio and one dihydroxy analog. Menzie, C.M. Metabolism of Pesticides-Update III.
How does adsorption to soil affect SRC of dibenzofuran?
However, adsorption to soil is expected to attenuate volatilization(SRC). Dibenzofuran is not expected to volatilize from dry soil surfaces(SRC) based upon its vapor pressure(4). Photoreactor studies indicate that photodegradation may occur in surface soil but degradation rates appear to be slow(6).