To understand if groundwater contamination
is a problem in an aquifer, it is necessary to know both the type
and amount of contaminant in the groundwater system.
amounts of contaminants in terms of concentration.
More specifically, we use the concepts of ppm and ppb, which
are parts per million and parts per billion.
- PPM is simply the amount of contaminant units in 1,000,000
(1 million) units of groundwater.
- PPB is likewise the amount of contaminant units in 1,000,000,000
(1 billion) units of groundwater.
- You could make up your own concentration measurements as well,
such as PPH (parts per hundred), which would be
the amount of contaminant units in 100 units of groundwater.
In fact we already
use PPH but we call it percent, %. (1pph = 1/100 =1%)