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Instructions for the Preparation of Standard Solutions
Standard solution of hydrogen peroxide
Preparation of a stock solution:
Place 10 ml of Perhydrol 30 % H
O
GR in a
2
2
calibrated or conformity-checked 100-ml
volumetric flask and make up to the mark with DI
water. Transfer 30 ml (full pipette) of this solution to
a calibrated or conformity-checked 1-l volumetric
flask and make up to the mark with DI water. The
stock solution prepared according to this proce-
dure has a concentration of approximately
1000 mg/l hydrogen peroxide.
Precise assay of the standard solution (stock
solution) for hydrogen peroxide:
Pipette 50.0 ml (full pipette) of the hydrogen per-
oxide stock solution of approx. 1000 mg/l into a
500-ml conical flask, dilute with 200 ml of DI water,
and add 30 ml of sulfuric acid 25 % GR. Titrate
with a 0.02 mol/l potassium permanganate
solution until the colour changes to pink.
Calculation of the exact content of the
hydrogen peroxide concentration:
Consumption of potassium permanganate (ml)
34.02 = content of hydrogen peroxide, in mg/l
x
Further investigational concentrations may be pre-
pared from the stock solution exactly determined
according to the procedure described above by
diluting accordingly.
Stability:
When stored in a cool place (refrigerator), the
stock solution and the further diluted investiga-
tional solutions remain stable for one day.
Reagents required:
1.09122.1000 Potassium permanganate solution
0.02 mol/l 0.1 N
1.07209.0250 Perhydrol 30 % GR
1.00716.1000 Sulfuric acid 25 % GR
1.16754.9010 Water GR
Release 07/03
XXVI
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