Thermo Fisher Scientific Ion Selective Electrodes Ammonium User Manual
Page 5
TABLE OF CONTENTS
GENERAL INSTRUCTIONS .......................................................................................................... 1
Required Equipment........................................................................................................................ 1
Required Solutions .......................................................................................................................... 1
GENERAL PREPARATION............................................................................................................ 2
Electrode Preparation ...................................................................................................................... 2
Electrode Slope Check (with standard pH/mV meter).................................................................... 2
Electrode Slope Check (with ion meter) ......................................................................................... 2
MEASUREMENT.............................................................................................................................. 3
Measuring Hints .............................................................................................................................. 3
Sample Requirements...................................................................................................................... 3
Units of Measurement ..................................................................................................................... 3
MEASUREMENT PROCEDURE ................................................................................................... 4
Direct Measurement ........................................................................................................................ 4
Direct Measurement of Ammonium (using a standard pH/mV meter)........................................... 4
Direct Measurement of Ammonium (using an ion meter) .............................................................. 5
Low Level Ammonium Determination (using a standard pH/mV meter) ...................................... 6
Low Level Ammonium Determination (using an ion meter).......................................................... 7
ELECTRODE CHARACTERISTICS............................................................................................. 7
Reproducibility................................................................................................................................ 7
Interference...................................................................................................................................... 7
Temperature Influences................................................................................................................... 8
Electrode Response ......................................................................................................................... 9
Electrode Storage ............................................................................................................................ 9
Detection Limit ............................................................................................................................... 9
pH Effects...................................................................................................................................... 10
Electrode Life................................................................................................................................ 10
ELECTRODE THEORY ................................................................................................................ 10
Electrode Operation ...................................................................................................................... 10
TROUBLESHOOTING .................................................................................................................. 11
Troubleshooting Guide.................................................................................................................. 11
Meter ............................................................................................................................................. 11
Electrodes ...................................................................................................................................... 11
Standard......................................................................................................................................... 12
Sample ........................................................................................................................................... 12
Technique ...................................................................................................................................... 12
TROUBLESHOOTING HINTS..................................................................................................... 13
SPECIFICATIONS.......................................................................................................................... 15
ORDERING INFORMATION....................................................................................................... 15