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See Method 25d (8).
The percentage of cobalt in the fertiliser is given by:
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If Method 25c is used:
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where:
Co is the quantity of cobalt expressed as a percentage of the fertiliser;
xs is the concentration in μg/ml of the Co in the test solution (6.2);
xb is the concentration in μg/ml of the Co in the blank solution (7.1);
V is the volume in ml of extract obtained in accordance with Method 25a or 25b;
D is the factor corresponding to the dilution carried out in 6.2;
M is the mass in grams of the test sample taken in accordance with Method 25a or 25b.
Calculation of the dilution factor D: if (a1), (a2), (a3), . . ., (ai) and (a) are aliquot portions and (vl), (v2), (v3), . . ., (vi) and (100) are the volumes in ml corresponding to their respective dilutions, the dilution factor D is given by:
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