This volumetric solution is prepared using gravimetric and volumetric procedures. 1 ml = 0,03646 g HCl This solution was analyzed using a certified reference material (Tris(hydroxymethyl)-aminomethane). The certified reference material is ISO 17034 accredited, measured according to ISO/IEC 17025 and traceable to the International System of Units by means of a Standard Reference Material from NIST: SRM® 723 (Tris(hydroxymethyl)aminomethane (HOCH2)3CNH2 (Acidimetric Standard)).