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The determination of pH is one of the most common process chemical measurements made today. This booklet explains the principles behind the measurement and discusses ways of avoiding common pitfalls. The booklet also discusses industrial ORP (oxidation-reduction potential) measurements.
pH Theory Guide 3 METTLER TOLEDO Content Preface 8 1 Introduction to pH 9 1.1 Acidic or alkaline? 9 1.2 Why are pH values measured? 11 1.3 The tools for pH measurements 12 1.3.1 The pH electrode 13 1.3.2 Reference electrodes 15 1.3.3 Combination electrodes 16 1.4 What is a pH measuring system? 17 2 Practical considerations 18
To be able to measure pH one needs to have a measurement tool which is sensitive to the hydrogen ions that define the pH value. The principle of the measurement is that one takes a sensor with a glass membrane which is sensitive to hydrogen ions and observes the reaction between it and a sample solution.
The first section (practical considerations) of the book describes the sensor, and the other elements that constitute a pH measurement system. Together with a troubleshooting diagram, this section gives the information needed in order to ensure the correct working of the pH electrodes for long periods of time.
pH Theory The term pH is derived from a combination of “p” for the word power and “H” for the symbol of the element Hydrogen. Together the meaning is the power of hydrogen. pH serves as a convenient way to compare the relative acidity or alkalinity of a solution at a given temperature. A pH of 7 describes
pH measurement has a wide variety of industrial applications in virtually every industry. These range from water conditioning to specific process related measurements to waste treatment. WHAT IS pH? pH is a measure of the acidity or alkalinity of a water solution.
The Theory of pH Measurement. pH measurement has a wide variety of industrial applications in virtually every industry. These range from water conditioning to specific process related measurements to waste treatment. WHAT IS pH? pH is a measure of the acidity or alkalinity of a water solution.
