A Brief Introduction to the
Concepts of Toxicology
We Will Be Using
Throughout This Course
, Units Used to Measure
Chemicals
in the Environment
• PPM – Parts per million
• PPB – Parts per billion
• PPT – Parts per trillion
,A simple cube 1 cubic meter
in
volume
1m
1m
1m
, Is formed of 1,000,000 cubes,
1 cubic centimeter each
100cm 100cm x 100cm
x 100cm =
1,000,000cc
100cm
In 1 m3 block
1cc = 1ppm
100cm