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In the case of measuring the pH value of ultrapure water and low temperature and low ionized water, the traditional pH electrode uses an osmotic reference electrode system. The electrolyte will undergo ion exchange with the liquid to be tested through the porous liquid junction, which will affect the test. The accuracy of the pH value measured by the liquid. In general, the osmotic reference electrode system may generate a potential error of about 0.3pH due to the ion exchange through the liquid junction when measuring in ultrapure water or low temperature low ion water.
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