Liquid Use
Glass syringes are also conveniently used to measure and dispense solvents and other liquids. They are often used in air-free techniques to take solvents after thet have been purified in stills, or from containers sealed with septa, to prevent gas entering the solution. They can also be use for transportation of substances that react spontaneously with air (pyrophoric reagents).
Liquids drawn up into a gas syringes can optionally be sparged with inert gas before dispensing into a reaction vessel such as a Schlenk flask. This is done by drawing the liquid into the syringe via a needle, inserting the needle into the septum sealing a flask under a positive pressure of an inert gas, removing the glass plunger, and allowing the gas to bubble through the liquid in the syringe for several minutes. The glass plunger is then re-inserted and the liquid is added to the reaction flask. Other techniques such as cannulation can also be used to transfer liquids instead.
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Read more about this topic: Gas Syringe
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