Question 47 2, 3, 7, 8-TCDD (\"dioxin\") was formed historically as an unwanted

Question

Question 47

2, 3, 7, 8-TCDD ("dioxin") was formed historically as an unwanted during production of What is the current primary source of 2, 3, 7, 8-TCDD to the environment? tons a few kilograms or a few grams? The number of chlorinated PCB congeners is 209. The number of brominated PBDEs is 209. Why the same number? Be specific. Consider propane. How many different dichloro propane isomers are there? Draw them Which of the two types, co-planar and non-co-planar PCBs, is generally more toxic in the ways that dioxins are toxic. Why?

Explanation / Answer

43)

A) 2,3,7,8-TCDD is an unwanted by-product formed during the production of hexachlorophene. 2, 3,7,8-TCDD may be formed during the chlorine bleaching process used by pulp and paper mills, and as a by-product from the manufacture of chlorinated phenols.

44) The current primary source of 2,3,7,8-TCDD is the combustion of fossil fuels including motor vehicles and wood. Most of the exposure of the general population to 2,3,7,8-TCDD is from food, mainly meat, dairy products, and fish.

45) The number of chlorinated PCB congeners is 209 and the number of brominated PBDEs is 209. The

Number is same, because bromine is analogous to chlorine. A polychlorinated biphenyl (PCB) is an organic chlorine compound with the formula C12H10xClx. The PBDE is an organic bromine compound with the formula C12H10xBrx. The PCB and PBDEs both consist of 209 possible substances.

46) There are 4different dichloropropane isomers. They are

1) CH3-CH2-CHCl2 = 1,1-dichloropropane

2) CH3-CHCl-CH2-Cl = 1,2-dichloropropane

3) Cl-CH2-CH2-CH2-Cl = 1,3-dichloropropane

4) CH3-CCl2-CH3 = 2,2-dichloropropane

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