Spectroquant Pharo 300 - Page 432

Release 06/2014
Spectroquant
®
photometers NOVA 60 and Pharo photometers
Instructions for the Preparation of Standard Solutions
Reagents required:
1.02400.0080 Potassium
hydrogen
phthalate GR
for analysis,
volum. standard
1.06404.0500 Sodium chloride
for analysis
EMSURE
®
1.16754.9010 Water for
analysis
EMSURE
®
Standard solution of COD/chloride
Preparation of a chloride dilution solution:
Dissolve 32.9 g of sodium chloride GR with distilled water in a calibra-
ted 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 con-
centration of 20 g/l Cl
-
.
Preparation of a COD/Cl
-
standard solution:
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 solution.
The standard solution prepared according to this procedure has a con-
centration of 1000 mg/l and 20 g/l Cl
-
.
Further investigational concentrations may be prepared from this stock
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 concentra-
tions) remain stable - depending on the respective concentration - for
approximately one week to one month.
Standard solution of cyanuric acid
Preparation of a standard solution:
Dissolve 1.00 g of cyanuric acid with distilled water in a calibrated or con-
formity-checked 1000-ml volu metric flask and make up to the mark with
distilled water. The substance is slightly soluble and the dissolution pro-
cess may take several hours.
The standard solution prepared according to this procedure has a con-
centration of 1000 mg/l cyanuric acid.
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 concentra-
tions) remain stable for one day.
Reagents required:
8.20358.0005 Cyanuric acid
for synthesis
1.16754.9010 Water for
analysis
EMSURE
®