vacuum filtration

Vacuum filtration is a chemistry technique used to separate solid particles from a liquid or gas using a filter medium. This process relies on a pressure difference, where the pressure on the outlet side of the filter is less than atmospheric pressure, creating a vacuum that draws the fluid through the filter while retaining the solid particles.12

This method is commonly employed in laboratories to speed up filtration, especially when dealing with fine precipitates. It involves pouring a mixture onto a filter paper in a funnel or using devices like fritted glass or glass fiber filters, all while maintaining a partial vacuum in the flask below. This technique is crucial for removing interferences in chemical analysis and can be applied to both liquid-gas and solid-gas filtrations.3