Thermo Fisher Scientific Ion Selective Electrodes Nitrate - Manual (Page 2)

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).....................................................................................................2
MEASUREMENT.............................................................................................................................. 3
Measuring Hints..........................................................................................................................................3
Sample Requirements .................................................................................................................................3
Units of Measurement.................................................................................................................................4
MEASUREMENT PROCEDURE ................................................................................................... 4
Direct Measurement....................................................................................................................................4
Direct Measurement of Nitrate (using a pH/mV meter) .............................................................................4
Direct Measurement of Nitrate (using an ion meter) ..................................................................................6
Low Level Nitrate Measurements (using a pH/mV meter).........................................................................6
Low Level Nitrate Determination (using an ion meter)..............................................................................7
ELECTRODE CHARACTERISTICS............................................................................................. 7
Reproducibility ...........................................................................................................................................7
Interferences ...............................................................................................................................................8
Temperature Influences ..............................................................................................................................9
Electrode Response.....................................................................................................................................9
Limits of Detection ...................................................................................................................................10
pH Effects .................................................................................................................................................10
Electrode Life ...........................................................................................................................................10
Electrode Storage......................................................................................................................................10
ELECTRODE THEORY ................................................................................................................ 10
Electrode Operation ..................................................................................................................................10
TROUBLESHOOTING GUIDE .................................................................................................... 12
Meter.........................................................................................................................................................12
Plastic-ware...............................................................................................................................................12
Electrodes .................................................................................................................................................12
Standards and Reagents ............................................................................................................................12
Sample ......................................................................................................................................................13
Technique .................................................................................................................................................13
ORDERING INFORMATION....................................................................................................... 16