pHavvik

pHavvik, or pH deviation, refers to the difference between the actual measured pH of a solution and a reference or target pH value. It is a common concept in chemistry, biology, environmental monitoring and industrial processes where pH control is important for reaction outcomes, stability, safety and quality.

pH is a measure of hydrogen ion activity in a solution, typically determined with a glass electrode connected to a pH meter. Readings are influenced by temperature, ionic strength and the condition of the measurement electrode. Calibrations with standard buffer solutions are essential, and many meters include temperature compensation to account for temperature effects on pH readings. Because of these factors, pH readings can deviate from the intended target even in well-controlled systems.

Several factors contribute to pHavvik. Temperature differences between the calibration and measurement conditions can shift the reading. Electrodes can foul or drift over time, affecting accuracy. The sample’s composition, such as buffering capacity, presence of strong acids or bases, and ionic strength, can alter the activity of hydrogen ions independent of concentration. Inadequate calibration, improper sample handling, or slow equilibration can also produce deviations.

Managing pHavvik involves regular calibration with appropriate buffers, ensuring temperature compensation is active, and standardizing measurement procedures. Documenting pH deviations helps quality control, informs corrective actions (such as adjusting additives or process conditions), and supports compliance in industries where pH control is critical, such as water treatment, fermentation, food production and pharmaceuticals.