J-BNB - VPMThane.org

PHYSIO-CHEMICAL PARAMETERS OF CREEK WATER BEFORE AND AFTER
GANPATI VISARJAN.
Hirendra Shelke 1 , Ajay Patil 1 , Yashwantkumar Shivappa 1 , Amit Mishra 1 , Suraj Rathi 1 , Dilip
Shenai 2 .
1. Students M Sc I Dept of Environment Science B.N Bandodkar College of Science
Thane (w).
2. Asst Professor, Dept of Environment Science B.N Bandodkar College of Science
Thane (w).
Introduction :
Water quality refers to chemical, physical & biological characteristics of water. It is the measure
of the condition of the water relative to the requirements of one or more biotic species & to any human
need or purpose. It is most frequently used by reference to a set of standards against which compliance
can be assessed. The most common standards used to assess water quality relate to health of ecosystems,
safety of human contact & drinking water.
The parameters of water quality are determined by the intended use. Work in the area of water
quality tends to be focused on water that is treated for human consumption, industrial use or in the
environment.
Dissolved Oxygen (D.O) , Total solids, Hardness, Chlorides,- Density etc these water parameters were
determined before & after Ganpati visarjan (For 1 & ½ day, 5 th , 7 th & 10 th day.)
Methodology:
Dissolved oxygen:-
The method used was winkler‘s azide modification titrimetric method . The sample were fixed on
the field using manganese sulphate solution [winkler‘s A] and alkali iodized azide solution [winkler‘s B]
The fixed samples were titrated against 0.0125N Na2s2o3 after addition of sulphuric acid to dissolved the
precipitate using starch as an indicator. The end point was blue to colourless.
Formula,
Dissolved oxygen(mg/l)= (N*C.B.R.*8*1000)/V2(V1-V)/V
Where,
V=total amt of chemical added
V1=total amt of water sample
V2=amt of sample taken for titration
N=normality of Na2S203
56 JBNB (Vol. I ) Issue I January’2013