atmosphere. Their impact on humans and nature. Emission sources What are dioxines and furans? The term Dioxin is commonly used to refer to a family of toxic chemicals that all share a similar chemical structure and a common mechanism of toxic action. Most dioxins and furans are not manmade or produced intentionally, but are created when other chemicals or products are made. This family includes: seven of the polychlorinated dibenzo dioxins (PCDDs), ten of the polychlorinated dibenzo furans (PCDFs) and twelve of the polychlorinated biphenyls (PCBs). · PCDD · 2,3,7,8TCDD · PCDF · PCB · PCDDs and PCDFs are not commercial chemical products but are trace level unintentional byproducts of most forms of combustion and several industrial chemical processes. Of all of the dioxins and furans, one, 2,3,7,8tetrachloropdibenzo dioxin (2,3,7,8 TCDD) is considered the most toxic.
(PAH) identified in numerous investigations nents accumulated in the meat depends on (Obiedzin´ ski and Borys 1977). Some smoked the temperature, humidity, agitation, and products contain up to 100 different PAH and composition of the smoke; the properties of their alkylated derivatives, of molecular the components, particularly their volatility weights from 116 (indene) to 302 (dibenzo- and solubility; the characteristics of the pyrenes). They are generated at temperatures surface of the product; and the duration of above 420°C and, having high boiling tem- smoking. Wet surfaces absorb about 20 times perature, are present mainly in the dispersed more phenols than dry ones. The published phase of smoke. Thus the contents of PAH data on the total amount of smoke compo-
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