# Fertilisers (Sampling and Analysis) Regulations (Northern Ireland) 1996, Paragraph 7: EXPRESSION OF RESULTS


If the samples for analysis and dilutions shown in the Table are used the following formulae apply:
%P2O5inthefertiliser=(A-a)×f %Pinthefertiliser=(A-a)×f' where:
A = weight in g of the quinoline phosphomolybdate
a = mass in g of the quinoline phosphomolybdate obtained in the blank test
f and f' = factors given in the last two columns of the Table.
With samples for analysis and dilutions which differ from those of the Table the following formulae apply:
%P2O5inthefertiliser=(A-a)×f×D×100M %Pinthefertiliser=(A-a)×f'×D×100M where:
f = conversion factor, quinoline phosphomolybdate into P2O5 = 0.0321
f' = conversion factor, quinoline phosphomolybdate into P = 0.0140
D = dilution factor
M = mass of the sample analysed.
TABLE FOR METHOD 10
% P2O5 in the fertiliser
% P in the fertiliser
Sample for analysis ml
Dilution to ml
Sample ml
Dilution to ml
Sample to be precipitated ml
Quinoline phosphomolybdate conversion factor (f) in percentage P2O5
Quinoline phosphomolybdate conversion factor (f') in percentage P
1-5
0.44-2.2
1
500
—
—
100
16.04
7.00
2.5
500
—
—
50
12.83
5.60
5
500
—
—
25
12.83
5.60
5-10
2.2-4.4
1
500
—
—
50
32.07
14.00
2.5
500
—
—
25
25.66
11.20
3
500
—
—
25
21.38
9.33
5
500
—
—
10
32.07
14.00
10-25
4.4-11.0
1
500
—
—
25
64.15
28.00
2.5
500
—
—
10
64.15
28.00
3
500
—
—
10
53.46
23.33
5
500
50
500
50
64.15
28.00
+ 25
+ 11
1
500
—
—
10
160.40
70.01
2.5
500
50
500
50
128.30
55.99
3
500
50
500
50
106.90
46.66
5
500
50
500
25
128.30
55.92

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Source: https://www.legislation.gov.uk/nisr/1996/513/schedule/2/part/I/chapter/10./paragraph/7 (the official version)
Page: https://openlegislation.uk/fertilisers-sampling-and-analysis-regulations-northern-ireland-1996/schedule-2/part-I/chapter-10./paragraph-7
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.