engineering recuitment PPSC JE Civil Mock Test 2022 Environmental Engineering Water Treatment

One Nephelometry Turbidity Unit (NTU) is equal to the turbidity produced by:

1
1 mg SiO2 dissolved in 1l of distilled water with the test being run according to absorption principle
2
1 mg SiO2 dissolved in 1l of distilled water with the test being run according to scattering principle.
3
1 mg Formazin dissolved in 1l of distilled water with the test being run according to absorption principle.
4
1 mg Formazin dissolved in 1l of distilled water with the test being run according to scattering principle.
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