Model ROWPU-1 Chlorine Test Kit Procedures.
Medium Range Test Instructions.
Fill the flask (1) to the 40 ml mark with the water to be tested.
Tear open one sulfite 1 reagent powder pillow (2). Add the contents of the pillow to the flask (1). Swirl
gently to mix.
Tear open one sulfamic acid powder pillow (3). Add the contents of the pillow to the flask (1). Swirl
gently to mix. This is the prepared sample.
A blue color will develop after the addition of the sulfamic acid if chlorine is present.
Fill the plastic measuring tube (4) level full with the prepared sample. Pour the sample into the square
mixing bottle (5).
Add sodium thiosulfate standard solution (6) drop by drop to the mixing bottle (5). Hold the dropper
vertically above the bottle to add drops. Swirl the bottle constantly while adding drops and count each drop as it is added.
Continue to add titrant until the sample is colorless.
Each drop used to bring about the color change in step (e) is equal to 1 mg/L chlorine (Cl).
Low Range Test Instructions. If the result from step (e) of the Medium Range test is low (2 mg/L or less), it is
advisable to test a larger sample to obtain a more sensitive test. This may be done directly in the flask by performing the
Using the sample left over from step 3 in the medium range test, pour off the contents of the flask (1)
until the level just reaches the 30 ml mark on the flask.
Add sodium thiosulfate (6) drop by drop to the flask (1). Hold the dropper vertically above the flask to
add drops. Swirl the flask constantly while adding drops and count each drop as it is added. Continue to add titrant until
the sample is colorless.
Each drop of sodium thiosulfate titrant (6) used to bring about the color change in step 2 is equal to 0.2
mg/l chlorine (CI).
Chlorine Kit Care.
Replace flask, mixing bottle or eye dropper if cracked or broken.
Replace sulfite 1 reagent, sulfamic acid reagent and sodium thiosulfate titrant as needed.
2-34 Change 7