Thermo Fisher Scientific Ion Selective Electrodes Fluoride - Manual (Page 3)

TABLE OF CONTENTS
GENERAL INSTRUCTIONS .......................................................................................................... 1
Introduction ...................................................................................................................................................1
Required Equipment......................................................................................................................................1
Required Solutions ........................................................................................................................................1
GENERAL PREPARATION............................................................................................................ 2
Electrode Preparation ....................................................................................................................................2
Electrode Slope Check (with pH/mV meter).................................................................................................2
Electrode Slope Check (with ion meter) .......................................................................................................3
MEASUREMENT.............................................................................................................................. 3
Measuring Hints ............................................................................................................................................3
Sample Requirements....................................................................................................................................4
Units of Measurement ...................................................................................................................................4
MEASUREMENT PROCEDURE ................................................................................................... 4
Direct Measurement ......................................................................................................................................4
Direct Measurement of Fluoride (using a pH/mV meter) .............................................................................4
Direct Measurement of Fluoride (using an ion meter) ..................................................................................6
Direct Measurement of Fluoride in Water (ASTM D1179, METHOD B) ...................................................6
Direct Measurement of Fluoride in Acid Solutions ......................................................................................7
Direct Measurement of Fluoride in Alkaline Solutions ................................................................................7
Low Level Fluoride Measurements (using a pH/mV meter).........................................................................8
Low Level Fluoride Determination (using an ion meter)..............................................................................8
Titration.........................................................................................................................................................9
Titration Procedure for Fluoride Determination............................................................................................9
ELECTRODE CHARACTERISTICS........................................................................................... 10
Reproducibility............................................................................................................................................10
Interference..................................................................................................................................................10
Complexation ..............................................................................................................................................11
Temperature Influences ...............................................................................................................................11
Electrode Response .....................................................................................................................................11
Limits of Detection......................................................................................................................................12
pH Effects....................................................................................................................................................12
Electrode Life ..............................................................................................................................................13
Electrode Storage ........................................................................................................................................14
ELECTRODE THEORY ................................................................................................................ 14
Electrode Operation.....................................................................................................................................14
TROUBLESHOOTING GUIDE .................................................................................................... 15
Meter ...........................................................................................................................................................15
Plastic-ware .................................................................................................................................................15
Electrodes ....................................................................................................................................................15
Standards and Reagents...............................................................................................................................16
Sample .........................................................................................................................................................16
Technique ....................................................................................................................................................16
TROUBLESHOOTING HINTS..................................................................................................... 17
SPECIFICATIONS.......................................................................................................................... 19
ORDERING INFORMATION....................................................................................................... 19