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


Preparation of extract solutions containing the elements to be determined
6.1 See Method 26a and/or 26b and, if appropriate, 26c.
Treatment of the test solution
6.2 Dilute an aliquot portion of the extract obtained by Method 26a, 26b or 26c with water and/or hydrochloric acid (4.1) or (4.2) so as to obtain, in the final solution for measurement, a concentration of the element to be determined that is appropriate to the calibration range used (7.2) and a hydrochloric acid concentration of at least 0.5 M and not more than 2.5 M. This operation may require one or more successive dilutions.
The final solution has to be obtained by placing an aliquot portion of the diluted extract in a 100 ml volumetric flask. Let the volume of this aliquot portion be (a) ml. Add 10 ml of the lanthanum salt solution (4.3). Make up to volume with 0.5 M hydrochloric acid solution (4.2) and mix thoroughly. Let D be the dilution factor.

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Source: https://www.legislation.gov.uk/nisr/1996/513/schedule/2/part/I/chapter/26d./paragraph/6 (the official version)
Page: https://openlegislation.uk/fertilisers-sampling-and-analysis-regulations-northern-ireland-1996/schedule-2/part-I/chapter-26d./paragraph-6
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.