J-BNB - VPMThane.org

N=normality of Na2S203
Total Solids:-
The total solids were determined by evaporation method.the total solids were the residur left after
evaporation of unfiltered sample.the total dissolved solids were determined as the total residue left after
evaporation of filtered sample while total suspended solids were the difference between the values of total
solids and total dissolved solids.
Formula,
(1)Total suspended solids(mg/l)=W2-W3*1000*1000/vol. of sample.
(2)Total dissolved solids(mg/l)=W2-W3*1000*1000/vol. of sample
(3)Total solids(mg/l)=total suspended solids+total dissolved solids.
Hardness :-
Hardness was estimated by Argentiometric method.The titration of the sample was carried out
against std. silver nitrate solution using Erichrome black-T as indicator where the end point was wine red
to blue.
Formula,
Hardness(mg/l)=(A*B)*N*1000/vol. of sample
Where,
A=burette reading in ml
B=1 as 1 ml, caco3 of titrant
Chlorides:-
The method used was Argentiometric method.The chloride ion was estimated by titration with
std.AgNO3 using potassium chromate as the indicator. The end point was yellow to brick red.
Formula,
Chlorides(mg/l)=(A-B)*N*1000/vol. of sample
Where,
A=ml titration for sample
B= ml titration for blank
N= normality of AgNO3
PH:-
The ph of samples are calculated by ph meter,ph mpaper and by using universal indicator.
59 JBNB (Vol. I ) Issue I January’2013