Millipore Spectroquant Multy Operating Manual page 218

Standard solution of silicate
Preparation of a standard solution:
A silicon standard solution of 1000 mg/l is used.
1000 mg/l Si corresponds to 2139 mg/l SiO
Further investigational concentrations may be prepared from
this standard solution 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 concentration of 10.00 mg/l SiO
After its preparation, the solution must be immediately trans-
ferred to a clean polyethylene vessel for further storage.
Further investigational concentrations may be prepared from
this standard solution by diluting accordingly with distilled
water.
After its preparation, the solution with the desired working
concentration must be immediately transferred to a clean poly-
ethylene 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.
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 from
this standard solution by diluting accordingly with distilled
water.
Stability:
When stored in a cool place (refrigerator), the diluted standard
solutions (investigational concentrations) remains stable for
one month.
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2
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2
Reagents required:
1.70236.0100 Silicone standard
solution Certipur
1.16754.9010 Water for analysis
EMSURE®
Reagents required:
1.19897.0500 Chloride standard
solution Certipur
1.16754.9010 Water for analysis
EMSURE®
Chapter 5.2 | Page 18 of 23
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