Alat yg digunakan
Potentiometer = 751 GPD Titrino / Titroprocessor
Electrodes = 6.0431.100 Pt Titrode; input 1
Pereaksi
c(Na2S2O3) = 0.01 mol/L; D0
Prepared daily from c = 0.1 mol/L
Sampel
app. 5 g sunflower oil
50 mL glacial acetic acid / chloroform (3 : 2)
1 mL KI saturate
100 mL dist. water
Remarks
· Calculations:
Perox.No=(EP1-C01)*C02/C00;2;meq/kg
Perox.No = peroxide number in meq.O2/kg
C01 = consumption of blank sample (0 mL)
C02 = factor (10)
. Answer
Perox.No = 0.8874 x 10 / 5.0188 = 1.77 meq/Kg
EP1 = 0.8874 mL
C00 = 5.0188 g
· Sample preparation:
Weigh out accurately 5 g sample in an Erlenmeyer flask and add 50 mL of the glacial acetic acid / chloroform mixture. Then add 1 mL of the KI solution and shake during 5 s. Now allow the mixture to stand for about 1 min. in a dark place. After this, rinse the contents of the
Erlenmeyer flask out into a beaker with 100 mL dist. water and immediately back-titrate the iodine thus liberated with sodium thiosulphate. A blank control sample should be prepared and treated in the same way. Enter the blank value as C01.
· The sample must be stirred well during the titration, in order to obtain
a good emulsion.
Literature
· Metrohm Application Bulletin No. 141: Analysis of edible oils and fats.
Potentiometer = 751 GPD Titrino / Titroprocessor
Electrodes = 6.0431.100 Pt Titrode; input 1
Pereaksi
c(Na2S2O3) = 0.01 mol/L; D0
Prepared daily from c = 0.1 mol/L
Sampel
app. 5 g sunflower oil
50 mL glacial acetic acid / chloroform (3 : 2)
1 mL KI saturate
100 mL dist. water
Remarks
· Calculations:
Perox.No=(EP1-C01)*C02/C00;2;meq/kg
Perox.No = peroxide number in meq.O2/kg
C01 = consumption of blank sample (0 mL)
C02 = factor (10)
. Answer
Perox.No = 0.8874 x 10 / 5.0188 = 1.77 meq/Kg
EP1 = 0.8874 mL
C00 = 5.0188 g
· Sample preparation:
Weigh out accurately 5 g sample in an Erlenmeyer flask and add 50 mL of the glacial acetic acid / chloroform mixture. Then add 1 mL of the KI solution and shake during 5 s. Now allow the mixture to stand for about 1 min. in a dark place. After this, rinse the contents of the
Erlenmeyer flask out into a beaker with 100 mL dist. water and immediately back-titrate the iodine thus liberated with sodium thiosulphate. A blank control sample should be prepared and treated in the same way. Enter the blank value as C01.
· The sample must be stirred well during the titration, in order to obtain
a good emulsion.
Literature
· Metrohm Application Bulletin No. 141: Analysis of edible oils and fats.
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