CAN/CGSB-25.1 No. 13.2-95
1. Scope
1.1 This test method specifies the apparatus and procedures for the
electrometric measurement of pH values of aqueous solutions with the glass
electrode. It does not deal with the manner in which the solutions are
prepared. pH measurements of good precision can be made in aqueous solutions
containing high concentrations of electrolytes or water-soluble organic
compounds, or both. It should be understood, however, that pH measurements in
such solutions are only a semiquantitative indication of hydrogen ion
concentration or activity. The measured pH will yield an accurate result for
these quantities only when the composition of the medium matches approximately
that of the standard reference solutions. In general, this test method will
not give an accurate measure of hydrogen ion activity unless the pH lies
between 2 and 12 and the concentration of neither electrolytes nor
nonelectrolytes exceeds 0.1 M.
1.2 This standard may involve hazardous materials, operations, and equipment.
This standard does not purport to address all of the safety problems associated
with its use. It is the responsibility of the user of this standard to
establish appropriate safety and health practices and determine the
applicability of regulatory limitations prior to use.
OEN:
ONGC
Langue:
English
Code(s) de l'ICS:
75.140
Statut:
Annulée
Date de Publication:
1995-09-29
Numéro Standard:
CAN/CGSB-25.1 No. 13.2-95