Conclusions
•
Stable stock calibrationmixtures can be preparedbycarefullyconsidering
potential chemical interactions between target analytes, impurites, solvents,
and solvent stabilizers.
•
Solventsmust be carefullychosen and screened toobtain good shelf life of
stock solutions.
•
Stock solution storage plays a role in shelf life.
Amber glass ampuleswill
prevent reactions caused by light.
While refrigerator storage is generally
recommended for semivolatile standards, freezer storagewill improve stability
for certainmixtures, especiallyanilines andbenzidines.
