Division 7.2: Calculation in the case of direct potentiometric titration - Third Commission Directive of 27 September 1983 on the approximation of the laws of the Member States relating to methods of analysis necessary for checking the composition of cosmetic products (83/514/EEC)

Let:

V₂

the volume (in millilitres) of the sulphuric acid solution (4.4) used,

M₂

its actual molarity (4.4),

m

the mass (in milligrams) of the test portion (6.1) taken,

then:

ammonia % (m/m) = \frac{V_{2} {× M}_{2} × 17 × 100}{0,4 m} = \frac{{4250 V}_{2} M_{2}}{m}

Division 7.2 Calculation in the case of direct potentiometric titration