Gooch crucible
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A Gooch crucible, named after Frank Austen Gooch, is a filtration device for laboratory use. It is convenient for collecting a precipitate directly within the crucible in which it is finally to be weighed. The crucible is typically a few centimeters high and is made of porcelain. The bottom of a Gooch crucible is perforated with a number of small holes.
Before used in filtration, a slurry or suspension of asbestos in water is poured into the crucible to form a mat of solid material. The material to be suspended is then poured into the crucible and onto the asbestos, the water being allowed to drain through the crucible's small holes. Some Gooch crucibles, such as the one in the drawing, permit two layers of asbestos to be used, separated by a perforated porcelain plate.[1]
The use of asbestos has been curtailed in many laboratories in the recent years, so that Gooch crucibles now come with a perforated porcelain or ceramic material for filtrations.
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- ^ Most of this article is adapted from p. 112 of A Text-book of Quantitative Chemical Analysis by Alex Charles Cumming, Sydney Alexander Kay (1913)
