Description
A Gooch crucible with Sintered Disc, was invented by Frank Austin Gooch hence it was name after him, is a filtration device for laboratory use (and was also called a Gooch filter. It is convenient for collecting a precipitate directly within the vessel in which it is to be dried, possibly ashed (a process of mineralization for preconcentration of trace substances prior to a chemical analysis, such as chromatography, or optical analysis, such as spectroscopy), and finally weighed in gravimetric analysis – which is describes a set of methods used in analytical chemistry for the quantitative determination of an analyte (the ion being analyzed) based on its mass. The principle of this type of analysis is that once an ion’s mass has been determined as a unique compound, that known measurement can then be used to determine the same analyte’s mass in a mixture, as long as the relative quantities of the other constituents are known.
A Gooch crucible with Sintered Disc, was initially a standard platinum laboratory crucible with a perforated base into which asbestos pulp was placed to form the filter mat. The crucible was then heated in an oven to dry out until it attained constant weight. The use of these materials meant that after filtration, the crucible and its contents could be subjected to high temperature to dry the filtrate and possibly oxidize or ash it to minimum weight. However, because of the high cost of platinum, versions made of porcelain were introduced in 1882. Some Gooch crucibles, such, permit two layers of asbestos to be used, separated by a perforated porcelain plate.
Other inorganic fibers, like glass, have been used in place of asbestos. Gooch crucibles made of borosilicate glass with fritted glass bases are mainly used today. Gooch crucibles made of platinum are very suitable for the most corrosive materials, porcelain is used where ashing at high temperature is required, and those made of borosilicate glass are adequate for drying.
They may also be used for collection and processing of biological tissue samples within the same container and they come in different range: P0 30ml; P1 30ml; P2 30ml; P3 30ml, P4 30ml, P0 50ml; P1 50ml; P2 50ml, P3 50ml; P4 50ml. We supply and deliver in all surrounding areas in Johannesburg (Pretoria, Vereeniging, East rand, South rand and West rand) and around all South Africa by use of courier.
