AASHTO Designation: T 200-79 (2006) pdf free download

Standard   Method  of Test for

PH of Aqueous Solution With the Glass Electrode

AASHTO Designation:  T 200-79 (2006) ASTM Designation:   E 70-97 (2002)

AASHTO T 200-79 (2006) is identical to ASTM E 70-97 (2002).

Scope

AASHTO Designation: T 200-79 (2006) pdf free download

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 approxi•

mately 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 concen•

tration of neither electrolytes nor nonelectrolytes exceeds 0..1

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