Release 06/2014
Spectroquant
®
photometers NOVA 60 and Pharo photometers
Instructions for the Preparation of Standard Solutions
Standard solution of free chlorine
Preparation of a standard solution:
Dissolve 1.85 g of dichloroisocyanuric acid sodium salt dihydrate 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 con-
centration of 1000 mg/l free chlorine.
Further investigational concentrations may be prepared from this stan-
dard solution by diluting accordingly with distilled water.
Stability:
When stored in a cool place (refrigerator), the standard solution of
1000 mg/l and the diluted standard solutions (investigational concen-
trations) remain stable for one day.
Note:
This is a standard solution that can be prepared particularly rapidly and
easily.
Standard solutions of free chlorine
All standard solutions described here for free chlorine yield equiv-
alent results and are identically suited for the determination of
chlorine.
Reagents required:
1.10888.0250 Dichloroiso-
cyanuric acid
sodium salt di-
hydrate GR for
analysis
1.16754.9010 Water for
analysis
EMSURE
®
Standard solution of calcium
Preparation of a standard solution:
Dissolve 2.946 g of calcium nitrate tetrahydrate with distilled water in a
calibrated or conformity-checked 500-ml volumetric flask and make up
to the mark with distilled water.
The standard solution prepared according to this procedure has a con-
centration of 1000 mg/l calcium.
Further investigational concentrations may be prepared from this stan-
dard solution by diluting accordingly with distilled water.
Stability:
The standard solution of 1000 mg/l remains stable for one week. The
diluted standard solutions (investigational concentrations) remain stable
for one day.
Reagents required:
1.02121.0500 Calcium nitrate
tetrahydrate
for analysis
EMSURE
®
1.16754.9010 Water for
analysis
EMSURE
®
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