Millipore Spectroquant Multy Operating Manual page 211

Standard solution of total chlorine
Preparation of a standard solution:
Dissolve 4.00 g of chloramine T 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 total chlorine.
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 and the diluted standard solutions
(investigational concentrations) remain stable for one day.
Standard solution of chlorine dioxide
analogous to DIN EN ISO 7393
Preparation of a KlO stock solution:
3
Dissolve 1.006 g of KlO
3
calibrated or conformity-checked 1000-ml volumetric flask.
Subsequently make up to the mark with distilled water.
Preparation of a KlO /Kl standard solution:
3
Transfer 13.12 ml of the KlO
conformity-checked 1000-ml volumetric flask, add approx. 1 g
of Kl and make up to the mark with distilled water.
1 ml of this solution is equivalent to 0.025 mg of chlorine
dioxide.
Preparation of the chlorine dioxide standard solution:
Pipette 10.0 ml (full pipette) KlO
calibrated or conformity-checked 100-ml volumetric flask, add
2.0 ml of H SO 0.5 mol/l, leave to stand for 1 min, and then
2 4
add NaOH 2 mol/l dropwise (approx. 1 ml) until the solution
just loses its color. Subsequently make up the solution to the
mark with distilled water.
The concentration of the solution is 2.50 mg/l chlorine dioxide.
Stability:
The KlO stock solution remains stable for 4 weeks when stored
3
in a cool place (refrigerator). The KlO
be used for 5 hours when stored in a cool place (refrigerator).
The diluted chlorine dioxide standard solution is not stable and
must be used immediately.
in 250 ml of distilled water in a
stock solution to a calibrated or
3
/Kl standard solution into a
3
/Kl standard solution can
3
Reagents required:
1.02426.0250 Chloramine T tri-
hydrate GR for
analysis
1.16754.9010 Water for analysis
EMSURE®
Reagents required:
1.02404.0100 Potassium iodate,
volumetric standard
1.05043.0250 Potassium iodide for
analysis EMSURE®
1.09072.1000 Sulfuric acid
0.5 mol/l Titripur®
1.09136.1000 Sodium hydroxide
solution 2 mol/l
Titripur®
1.16754.9010 Water for analysis
EMSURE®
Chapter 5.2 | Page 11 of 23