Division 7 CALCULATION

The concentration of the total fluorine content of the sample (in per cent by mass of fluorine) (% (m/m) F) is given by:

$$\mathrm{\%\; F\; =}\frac{m_1}{m}\mathrm{\times \; 100\; \%}$$

where:

m

the test portion (in milligrams) (6.1.2),

m₁

the amount of F (in milligrams) read from the calibration graph (6.1.8).