eutech-instruments ammonia gas 사용자 설명서

Instruction Manual 

 

Ammonia Gas-sensing Electrode

 

 

20

TABLE OF CONTENTS 

 

Introduction.................................................................................................................................................1 
Required Equipment ...................................................................................................................................1 
Required Solutions......................................................................................................................................1 

Electrode Preparation..................................................................................................................................2 
Checking Membrane...................................................................................................................................2 
Changing Membrane (see Figure 4) ...........................................................................................................2 
Connecting the Electrode to the Meter .......................................................................................................3 
Electrode Slope Check (with pH/mV meter) ..............................................................................................3 
Electrode Slope Check (with ion meter).....................................................................................................3 

Measuring Hints..........................................................................................................................................4 
Sample Storage ...........................................................................................................................................4 
Sample Requirements .................................................................................................................................5 
Units of Measurement.................................................................................................................................5 

Direct Measurement....................................................................................................................................5 
Direct Measurement of Ammonia (using a pH/mV meter) ........................................................................5 
Direct Measurement of Ammonia (using an ion meter) .............................................................................6 
Low Level Ammonia Determination (using a pH/mV meter) ....................................................................7 
Ammonia Measurements in Membrane Wetting Solutions ........................................................................8 

Reproducibility ...........................................................................................................................................9 
Interference .................................................................................................................................................9 
Effect of Dissolved Species ........................................................................................................................9 
Complexation............................................................................................................................................10 
Temperature Influences ............................................................................................................................10 
Electrode Response...................................................................................................................................10 
Limits of Detection ...................................................................................................................................11 
pH Effects .................................................................................................................................................11 
Electrode Life ...........................................................................................................................................11 
Electrode Storage......................................................................................................................................11 

Electrode Operation ..................................................................................................................................11 
Ammonia Chemistry.................................................................................................................................12 

Meter.........................................................................................................................................................13 
Glassware..................................................................................................................................................14 
Electrodes .................................................................................................................................................14 
Standards...................................................................................................................................................14 
Sample ......................................................................................................................................................14 
Technique .................................................................................................................................................15 

Checking the Electrode Inner Body..........................................................................................................18