ASTM E77-07 test method defines the apparatus and procedures for measuring pH values in aqueous solutions electrometrically using a glass electrode. The values expressed in SI units are considered standard.
Scope:
ASTM E77-07 approach is commonly used to characterize aqueous solutions because it provides an accurate measurement of the hydrogen ion concentration. In the chemical industry, pH measurement is one of the most critical process control variables, and it plays a vital role in pollution management.
Procedure
In ASTM E77-07, the electrodes are cleaned and dried in the sample cup after calibrating the pH meter with two standard solutions. The test solution is poured into a cup section, and a preliminary pH value is obtained. One to three parts of well-buffered test solutions are adequate to provide pH readings that are repeatable to 60.02 units and exhibit drifts of less than 60.01 units in 1 or 2 minutes. The pH of water samples and slightly buffered solutions are measured.
Specimen size:
The potential difference between the hydrogen electrode and a glass electrode of the high-alkalinity type shall be the same, within + 3 mV, at pH 12.8 as at pH 9.18.
Results
The pH of the test solution is reported to the nearest 0.01 unit, and the temperature of the test solution is reported to the nearest 1°C.
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