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8. The percentage of trace element (E) in the fertiliser is given by:
If Method 26c has been used:
where:
E is the amount of the trace element determined, expressed as a percentage of the fertiliser;
xs is the concentration of the Fe or Zn in the test solution (6.2), in μg/ml;
xb is the concentration of the Fe or Zn in the blank solution (7.1), in μg/ml;
V is the volume of the extract obtained by Method 26a or 26b, 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 26a or 26b in grams.
Calculation of dilution factor D:
If (a1), (a2), (a3), . . ., (ai) and (a) are the aliquot portions and (v1), (v2), (v3), . . . , (vi) and (100) are the volumes in ml corresponding to their respective dilutions, the dilution factor D will be equal to:
D = (v1 / a1) × (v2 / a2) × (v3 / a3)x . . . x(vi / ai) × (100 / a).
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