Ortho-toluidine test measures the levels of:
Ans. b. Both free and combined chlorineTest for chlorination of waterOrtho-toluidine test (OT)Ortho-toluidine Arsenite test (OTA)* Free (residual) chlorine* Free chlorine* Free and Combined chlorine* Combined chlorineOTA test is better than OT test as:Detects both free and combine water chlorine separately.Not affected by interfering substances (Nitrites, Iron, and Manganese).
Combined chlorine
Both free and combined chlorine
Nitrates in water
Hardness of water
Environment and Health