Manual: Theory and Practice of pH Measurement

Theory and Practice of pH MeasurementPN 44-6033/rev. DDecember 2010 Theory AND Practice OF pH MEASUREMENTTABLE OF CONTENTSTHEORY AND PRACTICEOF pH MEASUREMENTTABLE OF CONTENTSS ection .. Definition of Measurements in Industry .. FOR MEASURING .. Electrode .. Junction Junction Reference THE pH Measurement .. Voltage to Electrode Slope .. and Using Temperature , Insulation, and LIMITATIONS .. Potential Mismatch .. ORP Measurements .. THE SENSOR .. and Insertion Applications .. Connections .. pH pH pH .. with Calibrations .. Loops ..29iTHEORY AND Practice OF pH MEASUREMENTTABLE OF CONTENTSTHEORY AND PRACTICEOF pH MEASUREMENTLIST OF APPENDICESS ection TitlePageASilver/Silver Chloride Electrode OF FIGURESF igure # TitlePage1-1 Operational Definition of pH Measurement Cell ..42-2 Measuring Cross-Section through the pH Glass ..52-4 Reference Electrode ..62-5 The Origin of Liquid Junction Potentials ..72-6 Comparison of Large Pore and Small Pore Liquid Junctions.

nearly as common as pH, certain industries make valuable use of the measurement. 1.1 INTRODUCTION pH is a measure of the relative amount of hydrogen and hydroxide ions in an aqueous solution. In any collection of water molecules a very small number will have dissociated to form hydrogen (H+) and hydroxide (OH-) ions: H2O = H+ + OH-

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