The Fertilisers (Sampling and Analysis) Regulations 1996

8.    EXPRESSION OF RESULTS

The percentage of trace element (E) in the fertiliser is equal to:

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If method (25c) has been used:

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where:

• E is the amount of the trace element determined, expressed as a percentage of the fertiliser;

• x_s is the concentration of the test solution (6.2), in μg/ml;

• x_b is the concentration of the blank solution (7.1), in μg/ml;

• V is the volume of the extract obtained by Method 25a or 25b, in ml;

• D is the factor corresponding to the dilution carried out in (6.2);

• M is the mass of the test sample taken in accordance with Method 25a or 25b in grams.

Calculation of dilution factor D:

If (a₁), (a₂), (a₃), . . ., (a_i) and (a) are the aliquot portions and (v₁), (v₂), (v₃), . . ., (v_i) and (100) are the volumes in ml corresponding to their respective dilutions, the dilution factor D will be equal to:

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