Page 109 - Feed Lab

Estimation of Iodine Value Suguna Management System Ver 1.0 / SOP / FQL / P2 - 24 Page 2 of 2

The below mentioned table indicates the amount of
Sample to be taken for Analysis.
Iodine Value Sample, gm Accuracy, mg
3 10.58 - 8.46 0.5
10 3.17 - 2.54 0.2
20 1.9 - 1.27 0.2

40 0.79 - 0.63 0.2
Picture - 1 Picture - 2
80 0.40 - 0.32 0.2
120 0.26 - 0.21 0.2

160 0.20 - 0.16 0.2
200 0.16 - 0.13 0.2

Note: If the reaction is not terminated by addition of
potassium iodide and water within 3 min past 1.0-hour
reaction time, sample must be discarded. The sample

Picture - 3 Picture - 4 must be titrated within 30 minutes of reaction
terminated, if not the analysis is invalid.

Picture - 5

CALCULATION
20.394 X wt. K2Cr2O7
Molarity of sodium thio sulphate solution, (M) = -----------------------------------------------------
Amount of sodium thio sulphate in ml

(B-S) X M X 12.69
Iodine value = --------------------------------
Wt. of Sample

Where,

B- T.V of Blank

S- T.V. of sample
M - Molarity of sodium thiosulphate

Prepared by : Approved by :
97 Director - Technical