Standard solution of silicate
Preparation of a standard solution:
A silicon standard solution of 1000 mg/l Si is used.
1000 mg/l Si corresponds to 2139 mg/l SiO
2
.
Further investigational concentrations may be prepared by diluting
accordingly with distilled water.
Example:
Mix 4.675 ml of silicon standard solution (1000 mg/l Si) 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 10.00 mg/l SiO
2
.
After its preparation, the solution must be immediately transferred to a
clean polyethylene vessel for further storage.
Further investigational concentrations may be prepared from this stan-
dard solution by diluting accordingly with distilled water.
After its preparation, the solution with the desired working concentration
must be immediately transferred to a clean polyethylene vessel for
further storage.
Stability:
The diluted standard solutions (investigational concentrations) remain
stable - depending on the respective concentration - for one day to
approximately six months.
Reagents required:
1.70236.0100 Silicone
standard
solution
Certipur
®
1.16754.9010 Water for
analysis
EMSURE
®
Release 06/2014
Spectroquant
®
photometers NOVA 60 and Pharo photometers
Instructions for the Preparation of Standard Solutions
Standard solution of sodium
Preparation of a standard solution:
A chloride standard solution of 1000 mg/l is used.
1000 mg/l chloride corresponds to 649 mg/l sodium.
Further investigational concentrations may be prepared by diluting
accordingly with distilled water.
Stability:
When stored in a cool place (refrigerator), the diluted standard solutions
(investigational concentrations) remain stable for one month.
Reagents required:
1.19897.0500 Chloride
standard
solution
Certipur
®
1.16754.9010 Water for
analysis
EMSURE
®
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