standard chemical potential

Of substance B at temperature T, μ B o ( T ), is the value of the chemical potential under specified standard conditions (in the standard state).
Source:
Green Book, 2nd ed., p. 53
See also:
PAC, 1994, 66, 533 (Standard quantities in chemical thermodynamics. Fugacities, activities and equilibrium constants for pure and mixed phases (IUPAC Recommendations 1994)) on page 536