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CADDIS Volume 2: Sources, Stressors & Responses

pH

Ways to Measure pH

pH meter: A typical pH meter consists of a measuring probe connected to an electronic meter that measures and displays the pH reading. Because the meter measures hydrogen ion activity rather than concentration, it is affected by temperature and by other ions in solution. The influence of temperature on pH is usually automatically adjusted for by the meter.

Color comparator: Color comparators involve adding an indicator reagent to the sample that colors the sample water. The intensity of the color is proportional to the pH of the sample. This color is then matched against a standard color chart. The pH can be determined by matching the colors from the chart to the color of the sample.


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