# Fertilisers (Sampling and Analysis) Regulations (Northern Ireland) 1996, Paragraph 6: PREPARATION OF THE ALIQUOT PORTION TO BE ANALYSED


Using a pipette, take an aliquot portion of the extraction solution obtained by method 15 or 17, containing between 15 and 50 mg of Ca ( = 21 to 70 mg of CaO). Let the volume of this aliquot be v2. Pour into a 400 ml beaker. If necessary, neutralise (change of indicator (4.7) from green to blue) with a few drops of the ammonia solution (4.3).
Add 1 ml of the citric acid solution (4.5) and 5 ml of ammonium chloride solution (4.6).

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Source: https://www.legislation.gov.uk/nisr/1996/513/schedule/2/part/I/chapter/20./paragraph/6 (the official version)
Page: https://openlegislation.uk/fertilisers-sampling-and-analysis-regulations-northern-ireland-1996/schedule-2/part-I/chapter-20./paragraph-6
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.