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Answer:
The number of significant figures of a quantity value implies specific r= equirements for the quantities (masses and volumes) to be measured, as deta= iled in the section on =E2=80=98Quantities=E2=80=99 in the Ph. Eur. Gen= eral Notices.
In tests with numerical limits and assays, the quantity stated to be tak= en for examination corresponds to the quantity used during development of t= he analytical procedure. The amount actually used may deviate by not more t= han 10 per cent from the stated quantity. In any case, the amount used is a= ccurately measured and the result of the test is calculated from this exact= quantity.
In tests where the limit is not numerical, which usually depend instead = upon comparison with the behaviour of a reference substance in the same con= ditions, the stated quantity is taken for examination.
Reagents are used in the prescribed amounts.