Page 133 - Feed Lab
P. 133
Laboratory Water Suguna Management System Ver 1.0 / SOP / FQL / P2 - 01 Page 2 of 2
5. After titrate the test solution to 0.1N standard
sodium thiosulphate solution with use starch
solution.
6. The end point is obtained when the solution turns
from blue-black to colourless. (V1)
CALCULATION
V1 x N.of Na S O x 2.262
3
2
2
The Sodium Chlorite (NaClO ) content = -----------------------------------
2
V x P
Where,
V1 - The volume of the Sodium Thiosulphate Standard Solution required for the titration.
V - The volume of the test sample
P - The density of the Sodium chlorite
20.394 X wt. K Cr O 7
2
2
Normality of sodium thiosulphate solution = -------------------------------------------
Amount of sodium thiosulphate in ml
Prepared by : Approved by :
121 Director - Technical
