PPB Definition in Chemistry (Parts Per Billion)

What Does PPB Mean in Chemistry?

PPB or parts per billion is used to describe concentration in extremely dilute solutions.
PPB or parts per billion is used to describe concentration in extremely dilute solutions. Glow Images, Inc / Getty Images

PPB stands for parts per billion. One part per billion is one part of solute per one billion parts solvent. PPB is a commonly used unit of concentration for very small values. The "parts per" notation is not part of the SI system of units. The notation describes dimensionless quantities. The ppb notation is most often seen in physics and engineering. In chemistry, the use of SI-compliant units is encouraged.

Source

  • Schwartz and Warneck (1995). "." Pure Appl. Chem. 67: 1377–1406.