ASTM E70 – pH of Aqueous Solutions with Glass Electrode
Aqueous solutions are used in numerous lubricating applications, such as metal working fluids and coolants. If the pH of these solutions is not correct, metals in the system may corrode, the solutions may oxidize or degrade and biological growth may be accelerated. This test determines the pH of aqueous solutions using a glass electrode.
The pH meter is calibrated, the electrode is immersed in the aqueous sample solution and the pH is measured and reported to 0.01 pH units.