The Fertilisers (Sampling and Analysis) Regulations (Northern Ireland) 1991

7.    EXPRESSION OF THE RESULTS

If the samples for analysis and dilutions shown in the Table are used the following formulae apply:

where:

• A = weight in g of the quinoline phosphomolybdate

• a = weight 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:—

where:

• f = conversion factor, quinoline phosphomolybdate into P20s = 0.03074

• f' = conversion factor, quinoline phosphomolybdate into P = 0.013984

• D = dilution factor

• M = weighing of the sample analysed

% P2O5 in the fertiliser	% P in the fertiliser	Sample for analysis g	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 2.5 5	500 500 500	— — —	— — —	100 50 25	16.037 12.830 12.830	6.992 5.594 5.594
5-10	2.2 -4.4	1 2.5 3 5	500 500 500 500	— — — —	— — — —	50 25 25 10	32.074 25.660 21.383 32.074	13.984 11.188 9.323 13.984
10-25	4.4 -11.0	1 2.5 3 5	500 500 500 500	— — — 50	— — — 500	25 10 10 50	64.148 64.148 53.457 64.148	27.968 27.968 23.307 27.968
+25	+11	1 2.5 3 5	500 500 500 500	— 50 50 50	— 500 500 500	10 50 50 25	160.370 128.296 106.913 128.296	69.921 55.937 46.614 55.937