COL119857 1222 - AN 005 pH of Pure Water and low conductivity waters pHISA

This application note discusses the challenges and recommendations for measuring pH in pure water and low conductivity waters, such as distilled, deionized, and rainwater. It highlights issues like electrode drift, sample contamination, and inaccurate measurements due to low ionic strength. The document offers best practices for sampling, calibrating, and handling pH electrodes, and recommends using the Orion Pure Water pH Test Kit and ROSS pH electrodes to improve accuracy and reliability.