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Question
Which of the following methods are employed for determination of free and combined chlorine residuals in water?
1. Starch-iodide method
2. Orthotolidine method
3. Amperometric titration method
4. SNORT method
5. DPD method
A.
1, 2, 4 and 5
B.
1, 2 and 3 only
C.
3, 4 and 5 only
D.
2, 3 and 4 only
Answer ( Option A)

1, 2, 4 and 5

Solution

The various methods and tests employed for determining amount of residual chlorine left after required contact periods
1. Orthotolidine test
2. DPD test
3. Chlorotex test
4. Starch-iodide test
5. SNORT test
Amperometric titration method is used for determination of total chlorine concentration in natural water.

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