Macro- and Micro-Contaminants Produced During Manufacture

Macro- and Micro-Contaminants Produced During Manufacture 

Micro-contaminants are present in chemicals at concentrations 1% of the mass. A very important class of micro-contaminants in a number of chlorinated chemicals is the chlorinated dioxins and furans. Dioxins are now classified as POPs [43], but in the late 1960s and early 1970s [201] became widely known when they were discovered to be micro-contaminants of 2,4,5-T-containing herbicides. There are numerous sources of dioxins but the most important source from synthetic chemicals is from 

Isomer LD50 in the insect Oncopeltusfasciatus (pgg-1) LD50 in the white rat (mg kg-1) 

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