This method is applicable to the determination of the pH value of aqueous dispersions (or aqueous solutions) of pesticides’ technical materials, powders, wettable powders, emulsifiable concentrates, etc.
2 Definitions
The pH value of an aqueous liquid is defined as the common logarithm of the reciprocal of the hydrogen ion concentration expressed in mol/L.
3 Outline of method
The pH value of an aqueous liquid is determined by means of a pH meter.
4 Reagents and solutions
4.1 Water: freshly boiled and cooled (to ambient temperature) distilled water of pH 5.5 to 7.0.
