Encyclopedia of Environmental Science and Engineering, Volume I and II

922 PCBs AND ASSOCIATED AROMATICS

TABLE 46

Combustion and Pyrolysis Products of PCB Replacement Fluids

Trade Names Primary Components Combustion Products Pyrolysis Products

Wemcol

Edisol II

Edisol III

Selectrol

Dielektrol

Aue et al. (1969, 1972) showed the applicability of

surface-bonded silicones to adsorb PCBs from water.

Extraction methods for PCBs from soil, sediment, sludge

and paper have used more polar solvents or solvent mix-

tures than that used for the analysis of water. Holden (1970),

for example, used a mixture of hexane and isopropanol to

extract PCBs from sewage sludge.

PCBs from non-carbon copy paper were extracted with

acetone in a Soxhlet apparatus for 3 days (Kuratsune and

Masuda, 1972).

PCB extraction from biological samples tends to be

complicated by problems of incomplete extraction, cleanup

losses etc. Extraction techniques have most often used

Soxhlet extraction to conserve the volume of solvent or a

percolation system with large volumes of solvent to obtain

satisfactory recovery efficiency. Soxhlet extraction was used

by Zitko (1972) in the extraction of tissue samples using

100 mL of hexane in a 1 hour extraction. Acker (1970) used

a combination of solvents passed through a tissue sample

homogenized with sea sand and packed into a column. The

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