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Infobox references. 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.
Polychlorinated dibenzo -p- dioxins (PCDDs), or simply dioxins. PCDDs are derivatives of dibenzo -p- dioxin. There are 75 PCDD congeners, differing in the number and location of chlorine atoms, and 7 of them are specifically toxic, the most toxic being 2,3,7,8-tetrachlorodibenzodioxin (TCDD). Polychlorinated dibenzofurans (PCDFs), or furans.
Zone A had a TCDD soil concentration of > 50 micrograms per square metre (μg/m 2); it had between 736 [8] [11] – 753 [12] residents. Zone B had a TCDD soil concentration of between 5 and 50 μg/m 2; it had 4737 residents. [8] Zone R had a negligible concentration of TCDD or up to < 5 μg/m 2; it had 31,800 residents. [8]
Valve has released the third Portal 2 trailer featuring Aperture Science president Cave Johnson, this time featuring the company's iconic automated turret.
A military staff or general staff (also referred to as army staff, navy staff, or air staff within the individual services) is a group of officers, enlisted and civilian staff who serve the commander of a division or other large military unit in their command and control role through planning, analysis, and information gathering, as well as by relaying, coordinating, and supervising the ...
NORWICH, Conn. (AP) — Veteran diplomat Martin S. Indyk, an author and leader at prominent U.S. think tanks who devoted years to finding a path toward peace in the Middle East, died Thursday.
It is a polycyclic heterocyclic organic compound, since HpCDD contains multiple cyclic structures (two benzene rings connected by a 1,4-dioxin ring) in which two different elements (carbon and oxygen) are members of its rings. [1] HpCDD has molecular formula C 12 HCl 7 O 2 and is an off-white powder, which is insoluble in water.
Polychlorinated dibenzofurans ( PCDFs) are a family of organic compounds with one or several of the hydrogens in the dibenzofuran structure replaced by chlorines. For example, 2,3,7,8-tetrachlorodibenzofuran (TCDF) has chlorine atoms substituted for each of the hydrogens on the number 2, 3, 7, and 8 carbons (see structure in the upper left ...