P
parts per million - Represents the concentration of
something in water or soil. One ppm is equivalent to 1 milligram
of something per liter of water (mg/l) or 1 milligram of something
per kilogram soil (mg/kg). (abbrev. ppm)
parts per billion - Represents the concentration of
something in water or soil. One ppb represents one microgram
of something per liter of water (ug/l), or one microgram of something
per kilogram of soil (ug/kg). (abbrev. ppb)
percolation - Movement of water through soil. The downward
movement of liquid (such as water) through a porus medium (such
as soil).
permeability - A term used to describe the ability
of water to move through a porus medium (such as soil). Soil
with a high coefficient (value) of permability can transmit water
more quickly than soil with a low coefficient of permability.
pollutant - Undesirable substances discharged to soil
or water, making the receiving body unfit for use.
polychlorinated biphenyl
- A man-made chemical produced by adding chlorine atoms to biphenyl
rings. There are 209 types of PCB compounds (congeners) described
by the general formula C12HxCly
where x=0 to 9 and y=10 - x. Westinghouse Corporation filled
electrical capacitors with PCB formulations manufactured by Monsanto
under the trade name Aroclor. (abbrev. PCB)
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