Water Quality Parameters
Total Solid and Suspended Solid
Acceptable limit of total solid = 500 mg/lit
Threshold odour number
where TON = Threshold odor number
constituents of Alkalinity
Equivalent weight of
Value of water
For strong acid.
For strong base
For neutral solution
Hardness of water
atomic weight of Ca = 40
atomic weight of Mg = 24
atomic weight of O = 16
atomic weight C = 12
valency of Ca = 2
Valency of Mg = 2
Note: -ve value is taken as zero.
Household supplies limit 74-115 mg/l
(e) The acceptable limit of hardness = 200 mg/lit as
and cause of rejection is 600 mg/lit as
Biochemical Oxygen Demand (BOD)
whereof 5 days
Loss of oxygen in mg/lit.
Initial dissolved oxygen concentration in the diluted sample.
Final dissolved oxygen concentration in the diluted sample.
(After 5 day of incubation of 20oC)
· Turbidity>5 units–detectable by naked eye.
· In Nephlometer, turbidity is expressed in FTU.
Testing of Colliforms is done
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