Method Abstract #99
Scope and Application
This method conforms to Standard Method 4500-H+ B, ISO 10523, NF T 90-008, ASTM D 1293 and EPA Method 9040C. It is a measure of the relative acidity or basicity of a solution measured on a scale of 0 to 14
pH is measured directly by a pH electrode that records the voltage difference between the solution and a reference electrode contained within the probe. The voltage measured from the samples is compared to a calibration curve to determine the H+ concentration.
Sample Calibration Curve
*The pH measuring range is based on aqueous samples. The pH range may be expanded to (-)9 – 23 pH units if required.
RSD values are better than those specified in Standard Methods.