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Water
Quality Testing Services ...
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Chlorine
Availability Test (CAT)
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| Chlorination
by addition of a disinfectant (bleaching powder or
liquid chlorine) is the
commonest treatment of water for drinking.
Effectiveness of this method is
dependent on the availability of chlorine in the
disinfectant. Bleaching powder
grade is assigned on the basis of available chlorine. | |
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| Water
disinfectant grade |
Expected
chlorine availability |
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Bleaching
Powder Liquid Chlorine |
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Grade-1 |
34% |
4%-6% |
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Grade-2 |
32% |
12.5%
- 15% |
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Poor quality
or stored disinfectant, may not satisfy the above
chlorine availability. Moreover,
the quantity of disinfectant required for proper
treatment of water is calculated on the
basis of chlorine availability. Thus, if you
have old stock of bleaching powder, it would be
desirable to find its chlorine
availability to help accurately calculate the quantity
of bleaching powder to be added
to water.
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This test estimates the chlorine availability in a
given sample of bleaching powder
or liquid chlorine. The test is useful as an
acceptance test, at the time of
purchasing disinfectants to determine whether the
product received from a supplier
satisfies the promised chlorine availability. The test
is also useful to calculate the
quantity of available disinfectant to be added for
treatment of water. | |
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| A.
Sample Required: | |
| 1.
Bleaching powder: Atleast 100 gms collected using a
dry plastic scoop and placed in
a sealed polythene (LDPE) packet.
2. Liquid chlorine: Atleast 100 ml
collected in a dry air tight plastic bottle.
3. Both: Deliver the product in its
original package. In this case a sample can
be taken by the laboratory for testing and rest of the
product can be collected by the
consumer. | |
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| B.
Test Duration: 24 hours. | |
| C.
Report Details: The percentage of available chlorine
by volume. | |
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