Instructions for the Preparation of Standard Solutions
Standard solution of hydrazine
Preparation of a standard solution:
Dissolve 4.07 g of hydrazinium sulfate GR with oxygen-low (boil pre-
viously) distilled water in a cali brated or conformity-checked 1000-ml
volumetric flask and make up to the mark with oxygen-low distilled
water.
The standard solution pre pared according to this procedure has a
concen tration of 1000 mg/l hydrazine.
Further investigational concentrations may be prepared from this stan-
dard solution by diluting accordingly with oxygen-low distilled water.
Stability:
When stored in a cool place (refrigerator), the standard solution of
1000 mg/l and the diluted standard solutions (investiga tional concen-
trations) remain stable for one day.
Reagents required:
1.04603.0100 Hydrazinium
sulfate GR
for analysis
1.16754.9010 Water for
analysis
EMSURE
®
Release 06/2014
Spectroquant
®
photometers NOVA 60 and Pharo photometers
Reagents required:
1.09122.1000 Potassium
permanganate
solution
0.02 mol/l
Titripur
®
1.07209.0250 Perhydrol
®
30%
for analysis
EMSURE
®
1.00716.1000 Sulfuric acid
25% for analysis
EMSURE
®
1.16754.9010 Water for
analysis
EMSURE
®
Standard solution of hydrogen peroxide
Preparation of a stock solution:
Place 10.0 ml of Perhydrol
®
30% H
2
O
2
in a calibrated or conformity-
checked 100-ml volumetric flask and make up to the mark with distilled
water. Transfer 30.0 ml (full pipette) of this solution to a calibrated or
conformity-checked 1000-ml volumetric flask and make
up to the mark with distilled water.
The stock solution prepared according to this proce dure has a concen-
tration of approx. 1000 mg/l hydrogen peroxide.
Precise assay of the stock solution:
Pipette 50.0 ml (full pipette) of the hydrogen per oxide stock solution into
a 500-ml conical flask, dilute with 200 ml of distilled water, and add
30 ml of sulfuric acid 25%.
Titrate with a 0.02 mol/l potassium permanganate solution until the
color changes to pink.
Calculation and preparation of a standard solution:
Consumption of potassium permanganate solution 0.02 mol/l (ml) x
34.02 = content of hydrogen peroxide, in mg/l
Further investigational concentrations may be prepared from the stock
solution exactly determined according to the procedure described
above by diluting accordingly with distilled water.
Stability:
When stored in a cool place (refrigerator), the stock solution of approx.
1000 mg/l and the diluted standard solutions (investigational concen-
trations) remain stable for one day.
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