Certain less stable solvents are also available without additives because no suitable preservative exists that will not interfere with a specific analytical method. All these solvents require special handling to minimize degradation problems. Elevated levels of some solvent degradation products may even present safety hazards. It is best to avoid less stable solvents when developing methods. Unfortunately, some procedures require their use.
Most solvent manufacturers recommend using a product within one year.
This timetable begins on the date of solvent manufacture and not when the consumer purchases or receives it. As a general guideline, purchase solvents in quantities which will be used within three to six months. This simple but important notation aids stock rotation and inventory control. All solvents should be stored in a controlled environment. Keep unopened containers in a vented, approved flammable liquid storage cabinet at room temperature and minimize exposure to light, heat and oxygen.