Millipore Spectroquant Multy Operating Manual page 208

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 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 calcium.
Further investigational concentrations may be prepared from
this standard 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 concen-
trations) remain stable for one day.
Standard solutions of free chlorine
All standard solutions described here for free chlorine yield
equivalent results and are identically suited for the determi-
nation of chlorine.
Standard solution of free chlorine
Preparation of a standard solution:
Dissolve 1.85 g of dichloroisocyanuric acid sodium salt dihy-
drate 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 free 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.
Reagents required:
1.02121.0500 Calcium nitrate tetra-
hydrate for analysis
EMSURE®
1.16754.9010 Water for analysis
EMSURE®
Reagents required:
1.10888.0250 Dichloroisocyanuric
acid sodium salt
dihydrate GR for
analysis
1.16754.9010 Water for analysis
EMSURE®
Note
This is a standard solution that can
be prepared particularly rapidly and
easily.
Chapter 5.2 | Page 8 of 23