# Fertilisers (Sampling and Analysis) Regulations (Northern Ireland) 1996, Paragraph 7: PREPARATION OF SOLUTIONS TO BE MEASURED


Depending upon the expected sodium content of the extraction solution as in method 15 or 17 (5 g of fertiliser in 500 ml), carry out the dilutions in accordance with the following table:
Intermediate dilution
Final dilution
Na2O (%)
Na (%)
Sample (ml) (v2)
Dilution to ml (v3)
Sample (ml) (v4)
Dilution to ml
Degree of dilution
3-5
2.2-3.7
10
50
10
100
50
5-10
3.7-7.4
10
100
10
100
100
10-20
7.4-15
10
100
5
100
200
20-38
15-28
5
100
5
100
400
Make up the intermediate dilution with water. For the final dilution add 10 ml of the solution (4.5) to the 100 ml graduated flask.
For a test sample of 1 g multiply the volume of the final dilution (v4) by five.

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Source: https://www.legislation.gov.uk/nisr/1996/513/schedule/2/part/I/chapter/24./paragraph/7 (the official version)
Page: https://openlegislation.uk/fertilisers-sampling-and-analysis-regulations-northern-ireland-1996/schedule-2/part-I/chapter-24./paragraph-7
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.