Fusion Mixtures - PerkinElmer AVIO 500 Customer Hardware And Service Manual

Safety Practices
52
• Cool the completed digest before transferring it and diluting it. Add water
cautiously.
Digestions at Elevated Pressure
Acid digestions in a pressure digestion apparatus require special care at several
points, in addition to the precautions described above.
When using high pressure digestion vessels, consult the
!
manufacturer's instructions and recommendations, particularly
regarding organic material and possible explosive reactions.
Warning
Never use perchloric acid in a pressure digestion.
Avertissement: Lors de l'utilisation des récipients de digestion à
haute pression, consulter les instructions et recommandations du
fabricant, notamment en ce qui concerne la matière organique et des
réactions explosives possibles.
Ne jamais utiliser de l'acide perchlorique dans une digestion sous
pression.
• Use only the manufacturer's recommended amounts of sample and acid for the
type of sample you are preparing.
• Be sure the apparatus is in good condition and provides safe release of pressure
in the case of excess pressure buildup.
• Cool the apparatus to room temperature before attempting to open it.
• Open the apparatus in a fume hood to vent the entrapped fumes safely.

Fusion Mixtures

Dissolving a sample by reacting with a fusion-flux mixture is generally chosen
when other techniques for sample dissolution fail. The fusion-flux mixture should
be carefully selected. Knowledge of fusion-flux mixture/crucible compatibility is
essential. Heating the sample-flux mixture may initiate a vigorous or explosive
reaction.