eutech-instruments silversulfide epoxy ユーザーズマニュアル

Instruction Manual 

 

Silver/Silver Sulfide Electrode 

 

5

GENERAL PREPARATION 
 

 
Remove the rubber caps covering the electrode tips and the rubber insert covering the filling hole of 
the reference electrode. Fill the combination electrode or the reference electrode with the filling 
solution shipped with the electrode to a level just below the fill hole. No preparation is required for 
a sealed reference electrode. Connect the electrodes to the proper terminals as recommended by the 
meter manufacturer. 
 

(Check electrodes each day) 
 
Using silver standards: 
 

1. 

To a 150 ml beaker, add 100 ml of distilled water and 2 ml of ISA. Place the beaker on a 
magnetic stirrer and begin stirring at a constant rate. After assuring that the meter is in the 
mV mode, lower the electrode tips into the solution. 

 
2. 

Using a pipet, add 1 ml of 0.1M or 1,000 ppm silver standard to the beaker. When the 
reading has stabilized, record the millivolt reading. 

 
3. 

Using a pipet, add 10 ml of the same silver standard used above to the beaker. When the 
reading has stabilized, record the millivolt reading. 

 
4. 

Determine the difference between the two readings. A difference of 57±2 mV indicates 
correct electrode operation, assuming the solution temperature is between 20o and 25oC.  
See the 

TROUBLESHOOTING section if the potential change is not within this range. 

 
Using sulfide stock solutions: 
 

1. 

To a 150 ml beaker, add 50 ml of distilled water and 50 ml of SAOB solution.  Place the 
beaker on a magnetic stirrer and begin stirring at a constant rate. After assuring that the 
meter is in the mV mode, lower the electrode tips into the solution. 

 
2. 

Using a pipet, add 1 ml of weekly standard sulfide solution to the beaker. When the 
reading has stabilized, record the millivolt reading. 

 
3. 

Using a pipet, add 10 ml of weekly standard sulfide used above to the beaker. When the 
reading has stabilized, record the millivolt reading. 

 
4. 

Determine the difference between the two readings. A difference of 26±2 mV indicates 
correct electrode operation, assuming the solution temperature is between 20o and 25oC.  
See the 

 section if the potential change is not within this range. 

 
Slope is defined as the change in potential observed when the concentration changes by a factor of 
10.