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Instructions for the Preparation of Standard Solutions
Standard solution sulfite
Preparation of a standard solution:
Dissolve 1.57 g of sodium sulfite GR and 0.4 g of
®
Titriplex
III GR with distilled water in 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 pro-
cedure has a concentration of 1000 mg/l sulfite.
Further investigational concentrations may be
prepared from this stock solution by diluting
accordingly.
Stability:
When stored in a cool place (refrigerator), the
stock solution remains stable for only one day.
Reagents required:
1.06657.0500 Sodium sulfite GR for analysis
1.08418.0100 Titriplex
1.16754.9010 Water GR for analysis
Standard solution of
anionic surfactants
Preparation of a standard solution:
Dissolve 1.00 g of sodium 1-dodecanesulfonate
with distilled water in 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 procedure has a
concentration of 1000 mg/l anionic surfactants.
Further investigational concentrations may be
prepared from this stock solution by diluting
accordingly.
Stability:
When stored in a cool place (refrigerator), the
stock solution remains stable for one month. The
diluted investigational solutions must be used
immediately.
Reagents required:
1.12146.0005 Sodium 1-dodecanesulfonate
1.16754.9010 Water GR for analysis
Release 05/04
®
III GR for analysis
Standard solution of
cationic surfactants
Preparation of a standard solution:
Dissolve 1.00 g of N-cetyl-N,N,N-trimethyl-
ammonium bromide GR with distilled water in
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 procedure has a concentration
of 1000 mg/l cationic surfactants.
Further investigational concentrations may be
prepared from this stock solution by diluting
accordingly.
Stability:
When stored in a cool place (refrigerator), the
stock solution remains stable for one month. The
diluted investigational solutions must be used
immediately.
Reagents required:
1.02342.0100 N-cetyl-N,N,N-trimethylammo-
nium bromide GR for analysis
1.16754.9010 Water GR for analysis
XXVII
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