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15
CHLORIDE IN W
ATER
CHLORIDE IN WATER
0 to 150 ppm (mg/L)
METHOD ID: HI1007EN
DESCRIPTION
Method for the determination of chloride in water. The results are
expressed as
ppm (mg/L) as Chloride .
REFERENCE
Standard Methods for the Examination of Water and Wastewater
21
st
edition, Method 4500-Cl
ELECTRODE
• HI4115 Silver/Sulfide Combination ISE
REAGENTS
• HI70448 0.02M Silver Nitrate (1 L)
• HI70427 1.5M Nitric Acid Solution (500 mL)
• HI70436 Deionized Water (1 gal)
ACCESSORIES
• HI7072 Electrode Fill Solution (4 x 30 mL)
• 150 mL Glass Beaker
• 100 mL Class A Volumetric Pipette
• 10 mL Class A Volumetric Pipette
DEVICE PREPARATION
• Connect the Silver/Sulfide electrode to the titrator.
• Install a 25 mL burette filled with 0.02M silver nitrate (HI70448)
on pump one and verify that no air bubbles are present in the
burette or tubing. If necessary prime the burette until all the air
has been removed completely.
• For the determination of the exact concentration of the 0.02M
Silver Nitrate, follow HI0200EN 0.02M Silver Nitrate Titrant
Concentration
• Press from the main screen. Use the arrow keys to
highlight HI1007EN Chloride in Water and press .
ELECTRODE PREPARATION
• Prepare the Silver/Sulfide electrode according to the procedure in
the manual.
SAMPLE PREPARATION
• Use a class A volumetric pipette to transfer exactly 100.00 mL of
sample to a clean 150 mL beaker.
• Add 10.00 mL of 1.5M nitric acid (HI70427) to the beaker.
ANALYSIS
• Place the beaker under the stirrer assembly and lower it to
immerse the electrode and stirrer. Ensure that the reference
junction of the electrode is 5 to 6 mm below the surface. If
necessary add extra deionized water.
Note : The dispensing tip should be slightly submerged in the
sample.
• Press , the titrator will start the analysis.
• At the end of the titration, after detection of the equivalence
point, “Titration Completed” will appear with the result. The
result is expressed in
ppm (mg/L) of chloride .
• Remove the electrode and stirrer from the sample and rinse them
thoroughly with deionized water.
• Record the result.