Millipore Spectroquant Multy Operating Manual page 222

Standard solution of surfactants (nonionic)
Preparation of a standard solution:
Dissolve 1.00 g of Triton® X-100 GR with distilled water in a
calibrated or conformity-checked 1000-ml volu metric flask and
make up to the mark with distilled water.
The standard solution prepared according to this procedure has
a concentration of 1000 mg/l nonionic surfactants.
Further investigational concentrations may be prepared from
this standard solution by diluting accordingly with distilled
water.
Stability:
When stored in a cool place (refrigerator), the standard so-
lution of 1000 mg/l remains stable for one week. The diluted
standard solutions (investigational concentrations) must be
used immediately.
Standard solution of tin
Preparation of a standard solution:
A tin standard solution of 1000 mg/l is used.
Transfer 30 ml of HCl 1 mol/l to a calibrated or conformity-
checked 100-ml volumetric flask, add 10.0 ml (full pipette) of
the tin standard solution, and make up to the mark with
distilled water.
The standard solution prepared according to this procedure has
a concentration of 100 mg/l tin.
Further investigational concentrations may be prepared from
the standard solution by diluting accordingly with distilled
water and HCl 1 mol/l.
This is done in the following manner:
Transfer 1 ml of HCl 1 mol/l to a calibrated or conformity-
checked 100-ml volumetric flask. Withdraw the desired aliquot
from the tin standard solution 100 mg/l, add, make up to the
mark with distilled water, and mix.
Stability:
The tin standard solution 100 mg/l remains stable for 30 mi-
nutes. The diluted standard solutions (investigational concen-
trations) must be used immediately.
Reagents required:
1.12298.0101 Triton X-100
®
1.16754.9010 Water for analysis
EMSURE®
Reagents required:
1.70242.0100 Tin standard
solution
Certipur®
1.09057.1000 Hydrochloric
acid 1 mol/l
Titripur®
1.16754.9010 Water for analysis
EMSURE®
Chapter 5.2 | Page 22 of 23