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Silver/Silver Sulfide Electrode 

 

Instruction Manual 

 

6

(Check electrodes each day) 
 
Using silver standards: 
 

1. 

Prepare standard silver solutions whose concentrations vary by tenfold. Use either the 
0.1M AgNO

3

 or 1,000 ppm stock solutions. Use the serial dilution method for this 

preparation. 

 
2. 

To a 150 ml beaker, add 100 ml of the lower value standard and 2 ml of ISA. Place the 
beaker on a magnetic stirrer and begin stirring at a constant rate. Lower the electrode tips 
into the solution. Assure that the meter is in the concentration mode. 

 
3. 

Adjust the meter to the concentration of the standard and fix the value in the memory 
according to the meter manufacturer's instructions. 

 
4. 

Rinse the electrodes with distilled water and blot dry. 

 
5. 

To another 150 ml beaker, add 100 ml of the higher value standard and 2 ml of ISA. Place 
the beaker on a magnetic stirrer and begin stirring at a constant rate. Lower the electrode 
tips into the solution. 

 
6. 

Adjust the meter to the concentration of the standard and fix the value in the memory. 

 
7. 

Read the electrode slope according to the meter manufacturer's instructions. Correct 
electrode operation is indicated by a slope of 90-100%. See the

  TROUBLESHOOTING

 

section if the potential is not within this range. 

 
Using sulfide stock solutions: 
 

1. 

Prepare standard sulfide solutions whose concentrations vary by tenfold. Use the serial 
dilution method and the weekly sulfide standard to prepare these solutions. 

 
2. 

To a 150 ml beaker, add 50 ml of the lower value standard, 25 ml of SAOB, and 25 ml of 
distilled water. Place the beaker on a magnetic stirrer and begin stirring at a constant rate. 
Lower the electrode tips into the solution. Assure that the meter is in the concentration 
mode. 

 
3. 

Adjust the meter to the concentration of the standard and fix the value in the memory 
according to the meter manufacturer's instructions. 

 
4. 

Rinse the electrodes with distilled water and blot dry. 

 
5. 

To a 150 ml beaker, add 50 ml of the higher value standard, 25 ml of SAOB, and 25 ml of 
distilled water. Place the beaker on a magnetic stirrer and begin stirring at a constant rate. 
Lower the electrode tips into the solution. 

 
6. 

Adjust the meter to the concentration of the standard and fix the value in the memory.