Millipore Spectroquant Multy Operating Manual page 212

Standard solution of COD
Preparation of a standard solution:
Dissolve 0.850 g of potassium hydrogen phthalate 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 COD.
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 month. When stored
under appropriate cool conditions (refrigerator), the diluted
standard solutions (investigational concentrations) remain
stable - depending on the respective concentration - for
approximately one week to one month.
Standard solution of COD/chloride
Preparation of a chloride dilution solution:
Dissolve 32.9 g of sodium chloride 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 dilution solution prepared according to this procedure has
a concentration of 20 g/l Cl
Preparation of a COD/Cl
Dissolve 0.850 g of potassium hydrogen phthalate GR with
dilution solution in a calibrated or conformity-checked 100-ml
volu metric flask and make up to the mark with dilution solu-
tion.
The standard solution prepared according to this procedure has
a concentration of 10 000 mg/l COD and 20 g/l Cl
Further investigational concentrations may be prepared from
this standard solution by diluting accordingly with dilution
solution.
Stability:
When stored in a cool place (refrigerator), the dilution solution
of 20 g/l Cl and the standard solution of 10 000 mg/l COD /
-
20 g/l Cl remain stable for one month. When stored under
-
appropriate cool conditions (refrigerator), the diluted standard
solutions (investigational concentrations) remain stable -
depending on the respective concentration - for approximately
one week to one month.
.
-
standard solution:
-
.
-
Reagents required:
1.02400.0080 Potassium hydrogen
phthalate GR for
analysis, volumetric
standard
1.16754.9010 Water for analysis
EMSURE®
Reagents required:
1.02400.0080 Potassium hydrogen
phthalate GR for
analysis, volumetric
standard
1.06404.0500 Sodium chloride for
analysis EMSURE
1.16754.9010 Water for analysis
EMSURE®
Chapter 5.2 | Page 12 of 23
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