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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.
In 2000, the Hospital Association of Southern California (HASC) [15] [16] [17] determined that a uniform code system was needed after three people were killed in a shooting incident at a hospital after the wrong emergency code was called. While codes for fire (red) and medical emergency (blue) were similar in 90% of California hospitals queried ...
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]
The International Agency for Research on Cancer has classified TCDD as a human carcinogen (class 1) on the basis of clear animal carcinogenicity and limited human data, [42] and subsequently also 2,3,4,7,8-PCDF and PCB 126 as class 1 carcinogens. [43]
In the United States, response codes are used to describe a mode of response for an emergency unit responding to a call. They generally vary but often have three basic tiers: Code 3: Respond to the call using lights and sirens. Code 2: Respond to the call with emergency lights, but without sirens. Alternatively, sirens may be used if necessary ...
2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) is the reference chemical to which the toxicity of other dioxins and DLCs are compared. TCDD is the most toxic DLC known. Other dioxins and DLCs are assigned a scaling factor, or TEF, in comparison to TCDD. TCDD has a TEF of 1.0. Sometimes PCB 126 is also used as a reference chemical, with a TEF of 0.1.
The 2,4,5-T used was contaminated with 2,3,7,8-tetrachlorodibenzodioxin (TCDD), an extremely toxic dioxin compound. During the Vietnam war, between 1962 and 1971, the United States military sprayed 20,000,000 U.S. gallons (76,000,000 L) of chemical herbicides and defoliants in Vietnam, eastern Laos and parts of Cambodia, as part of Operation ...
[2] 2,3,7,8-Tetrachlorodibenzodioxin (TCDD) is always a contaminant in this compound's production. Several accidents releasing many kilograms of TCDD have been reported. The reaction between 2,4,5-trichlorophenol and formaldehyde is exothermic. If the reaction occurs without adequate cooling, TCDD is produced in significant quantities as a ...