# Fertilisers (Sampling and Analysis) Regulations (Northern Ireland) 1996, Paragraph 4: APPARATUS


Standard laboratory equipment, in particular:
4.1 Filter crucible with a plate of sintered glass and a capacity of 15 ml, plate diameter: 20 mm, total height: 50 mm, porosity 4 (pore diameter from 5 to 15μm);
4.2 Compressed nitrogen supply.
4.3 Apparatus made up of the following parts and assembled, if possible, by means of spherical ground joints (see Figure 9).
4.3.1 Absorption tube (A) about 200 mm long and 30 mm in diameter filled with soda lime (3.9) kept in place by fibreglass plugs.
4.3.2 500 ml reaction flask (B) with side arm and a round bottom.
4.3.3 Vigreux fractioning column about 150 mm long (C').
4.3.4 Double-surface condenser (C), 200 mm long.
4.3.5 Drechsel bottle (D) acting as a trap for any excess acid which may distil over.
4.3.6 Ice bath (E) to cool the Drechsel bottle.
4.3.7 Two absorption vessels (F1) and (F2), 32 to 35 mm in diameter, the gas distributor of which comprises a 10 mm disc of low-porosity sintered glass.
4.3.8 Suction pump and suction regulating device (G) comprising a T-shaped glass piece inserted into the circuit, the free arm of which is connected to a fine capillary tube by a short rubber tube fitted with a screw clamp.
Caution
The use of boiling chromic acid solution in an apparatus under reduced pressure is a hazardous operation and requires appropriate precautions.

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Source: https://www.legislation.gov.uk/nisr/1996/513/schedule/2/part/I/chapter/14c./paragraph/4 (the official version)
Page: https://openlegislation.uk/fertilisers-sampling-and-analysis-regulations-northern-ireland-1996/schedule-2/part-I/chapter-14c./paragraph-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.