eutech-instruments chloride epoxy Manuel D’Utilisation

Instruction Manual 

 

Chloride Electrode 

 

7

 
All samples must be aqueous and not contain organics which can dissolve the epoxy electrode body 
and/or the cement bonding the sensing crystal to the electrode body. Infrequent measurements in 
solutions containing methanol, ethanol, benzene, and acetonitrile are permitted. Highly polar 
solvents slowly attack the electrode. Please check with Eutech Instruments Pte Ltd. before using the 
electrode in other organic solvents. 
The temperature of the standard solutions and of the sample solutions should be the same and 
below 50

o

C. 

 
Interferences should be absent. If they are present, use the procedures found in the 

 

and 

 sections to remove them. 

 
The pH range for the chloride ion electrode is 2-12. Neutralize samples outside this range with acid 
or base to bring them in range. 
 

 
Chloride concentrations are measured in units of parts per million, equivalents per liter, moles per 
liter, or any other convenient concentration unit. Table 1 indicates some of the concentration units. 
 

TABLE 1: Concentration Unit Conversion Factors 

 
   ppm 

Cl

-1

 moles/liter 

Cl

-1 

    

354.50  

 

 

1.0X10

-2

 

 

 

 

  35.45     

   1.0X10

-3

 

 

 

 

   3.55   

   1.0X10

-4

 

 
 
MEASUREMENT PROCEDURE 
 

 
Direct measurement is a simple procedure for measuring a large number of samples. A single meter 
reading is all that is required for each sample. The ionic strength of samples and standards should 
be made the same by adjustment with ISA for all chloride solution. The temperature of both sample 
solution and of standard solutions should be the same. 
 

 

1. 

By serial dilution of the 0.1M or 1,000 ppm standards, prepare 10

-2

, 10

-3

, and 10

-4

M or 100 

and 10 ppm chloride standards. Add 2 ml of ISA per 100 ml of standard. Prepare standards 
with a composition similar to the samples if samples have an ionic strength above 0.1M. 

 
2. 

Place the most dilute solution (1.0x10

-4

M or 10 ppm) on the 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. When the reading has stabilized, record the mV reading.