Laboratory funnels Funnel

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there many different kinds of funnels have been adapted specialized applications in laboratory. filter funnels, thistle funnels (shaped thistle flowers), , dropping funnels have stopcocks allow fluids added flask slowly. solids, powder funnel wide , short stem more appropriate not clog easily.


when used filter paper, filter funnels, büchner , hirsch funnels can used remove fine particles liquid in process called filtration. more demanding applications, filter paper in latter 2 may replaced sintered glass frit. separatory funnels used in liquid-liquid extractions. tullgren funnel used collect arthropods plant litter or similar material.


construction

glass material of choice laboratory applications due inertness compared metals or plastics. however, plastic funnels made of nonreactive polyethylene used transferring aqueous solutions. plastic used powder funnels not come contact solvent in normal use.


uses

to channel liquid or fine-grained substances containers small opening. used pouring liquids or powders through small opening , hold filter paper in filtration. used in transferring liquids in small containers




^ dictionary of entomology. cabi. 2011. p. 172. isbn 184593542x. retrieved 9 july 2013. 






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