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10. TESTING DRINKING WATER
WITH WATABLUE (DETERMINATION
OF RESIDUAL CHLORINE)
The WataBlue reagent test determines the concentration of
residual chlorine in the treated water.
Materials : WataBlue reagent, graduated pipette, test tube
(all supplied).
W Always carefully rinse the test tube between tests.
W When checking the result, place the test tube on a
white surface and look at it from above.
1
For the first use, cut the tip off the reagent-bottle spout.
2
30 minutes after chlorination, collect 5 mL of treated water and transfer it
to the test tube.
3
Add one drop of WataBlue then shake the test tube.
4
The blue color produced by the reaction indicates the residual chlorine con-
centration in the drinking water..
`
If the sample remains colorless, there is insufficient
residual chlorine in the water (0-0.5 ppm). Increase the
chlorine dose, wait 30 minutes and perform the test again.
`
If the sample is light blue, the dosage is correct
and the water can be consumed without any
worry (0.5-1 ppm).
`
If the sample is too dark blue, there is too much
chlorine in the water (>1ppm). Dilute the treated
water by half, wait 30 minutes and perform the test
again.
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