Technical data sheet
Either pH Direct (unmodified sample) or pH 10%, where the sample is added to carbon dioxide-free water to form a 10% solution.
The hydrogen ion concentration of the sample is determined by measuring the electrical potential produced by an electrode that responds to hydronium ions. The electrical potential is converted to hydrogen ion concentration expressed as the negative logarithm of its concentration (pH). If dissolution or dispersion of the sample is necessary (a 10% solution), carbon dioxide-free water is used.
pH meter equipped with pH probe
AACC 02-52, AOAC 943.02 and 981.12
Sample size requirements
Direct: 50-100 mL per analysis
In Solution (10%): 10 g per analysis
Information required by submitter
Generally, the handling of samples intended for pH measurement requires no special effort. If carbonates or bicarbonates are present in a sample, submit the sample in a sealed container with little or no headspace to minimize the possible loss of carbon dioxide to prevent altering the pH of the sample.