Paragraph 7 EXPRESSION OF RESULTS

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

$$\mathrm{\%}\mathrm{P}2\mathrm{O}5\mathrm{in}\mathrm{the}\mathrm{fertiliser}=\left(\mathrm{A}-\mathrm{a}\right)\times \mathrm{f}$$ $$\mathrm{\%}\mathrm{P}\mathrm{in}\mathrm{the}\mathrm{fertiliser}=\left(\mathrm{A}-\mathrm{a}\right)\times \mathrm{f\text{'}}$$

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:

$$\mathrm{\%}\mathrm{P}2\mathrm{O}5\mathrm{in}\mathrm{the}\mathrm{fertiliser}=\genfrac{}{}{0.1ex}{}{\left(\mathrm{A}-\mathrm{a}\right)\times \mathrm{f}\times \mathrm{D}\times 100}{\mathrm{M}}$$ $$\mathrm{\%}\mathrm{P}\mathrm{in}\mathrm{the}\mathrm{fertiliser}=\genfrac{}{}{0.1ex}{}{\left(\mathrm{A}-\mathrm{a}\right)\times \mathrm{f\text{'}}\times \mathrm{D}\times 100}{\mathrm{M}}$$

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.