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2,3,7,8-Tetrachlorodibenzo-p-dioxin ( TCDD) is a polychlorinated dibenzo -p- dioxin (sometimes shortened, though inaccurately, to simply 'dioxin') [3] with the chemical formula C 12 H 4 Cl 4 O 2. Pure TCDD is a colorless solid with no distinguishable odor at room temperature.
Dioxins and dioxin-like compounds. Dioxins and dioxin-like compounds ( DLCs) are a group of chemical compounds that are persistent organic pollutants (POPs) in the environment. They are mostly by-products of burning or various industrial processes or, in the case of dioxin-like PCBs and PBBs, unwanted minor components of intentionally produced ...
Toxic equivalency factor. Toxic equivalency factor ( TEF) expresses the toxicity of dioxins, furans and PCBs in terms of the most toxic form of dioxin, 2,3,7,8-TCDD. [1] The toxicity of the individual congeners may vary by orders of magnitude . With the TEFs, the toxicity of a mixture of dioxins and dioxin-like compounds can be expressed in a ...
Polychlorinated dibenzodioxins. General structure of PCDDs where n and m can range from 0 to 4. Polychlorinated dibenzodioxins ( PCDDs ), or simply dioxins, are a group of long-lived polyhalogenated organic compounds that are primarily anthropogenic, and contribute toxic, persistent organic pollution in the environment. [1]
The pervasion of dioxin as described by Schechter et al. (made clear in very high TCDD or 2,3,7,8-tetrachlorodibenzo-p-dioxin levels in human milk, adipose tissue, and blood as measured by gas chromatography and mass spectroscopy) in the Vietnamese people living in Vietnam is substantially greater than that of other populations (Schechter et al ...
El Niño is a natural climate pattern marked by warmer than average ocean temperatures in the equatorial Pacific. When the water gets cooler than average, it’s a La Niña. Either phase can have ...
This is most ably illustrated by the case of Victor Yushchenko, who was apparently administered a very large dose of around 2 g of pure TCDD, and apparently has suffered only limited, short-term effects, e.g.chloracne, contrasted with reports from the Seveso incident in Italy where exposure to relatively small quantities of dioxin have led to ...
Octachlorodibenzodioxin. Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). ?) Octachlorodibenzodioxin (can be abbreviated as OCDD or OctaCDD) is one of polychlorinated dibenzodioxins (PCDDs). Its toxicity is similar to TCDD, but it is about 3000 times weaker.