Dating aroclors new england

In contrast, the major open application of PCBs was in carbonless copy ("NCR") paper, which even presently results in paper contamination.

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Other physical and chemical properties vary widely across the class.

As the degree of chlorination increases, melting point and lipophilicity increase, and vapour pressure and water solubility decrease.

Because of their lower toxicity, they are of less concern to regulatory bodies.

The only North American producer, Monsanto Company, marketed PCBs under the trade name Aroclor from 1930 to 1977.

It renders their structure similar to polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans, and allows them to act like PCDDs, as an agonist of the aryl hydrocarbon receptor (Ah R) in organisms.

They are considered as contributors to overall dioxin toxicity, and the term dioxins and dioxin-like compounds is often used interchangeably when the environmental and toxic impact of these compounds is considered.

The utility of PCBs is based largely on their chemical stability, including low flammability and high dielectric constant.

In an electric arc, PCBs generate incombustible gases.

Different Aroclors were used at different times and for different applications.

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