Standard solution of total hardness
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 (corresponds to 175 °e).
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 GR for
analysis
Release 06/2014
Spectroquant
®
photometers NOVA 60 and Pharo photometers
Instructions for the Preparation of Standard Solutions
Standard solution of tin
Preparation of a standard solution:
A tin standard solution of 1000 mg/l is used.
Transfer 30 ml of HCl 1 mol/l to a calibrated or conformity-checked
100-ml volumetric flask, add 10.0 ml (full pipette) of the tin standard
solution, and make up to the mark with distilled water.
The standard solution prepared according to this procedure has a con-
centration of 100 mg/l tin.
Further investigational concentrations may be prepared from the stan-
dard solution by diluting accordingly with distilled water and HCl 1 mol/l.
This is done in the following manner:
Transfer 1 ml of HCl 1 mol/l to a calibrated or conformity-checked
100-ml volumetric flask. Withdraw the desired aliquot from the tin
standard solution 100 mg/l, add, make up to the mark with distilled
water, and mix.
Stability:
The tin standard solution 100 mg/l remains stable for 30 minutes. The
diluted standard solutions (investigational concentrations) must be used
immediately.
Reagents required:
1.70242.0100 Tin standard
solution
Certipur
®
1.09057.1000 Hydrochloric
acid 1 mol/l
Titripur
®
1.16754.9010 Water for
analysis
EMSURE
®
Standard solution of volatile organic acids
Preparation of a standard solution:
Dissolve 2,05 g of sodium acetate anhydrous with distilled water in a
calibrated or conformity-checked 1000-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 1500 mg/l acetic acid.
Stability:
When stored in a cool place (refrigerator), the standard solution remains
stable for one week.
Reagents required:
1.06268.0250 Sodium acetate
anhydrous
for analysis
EMSURE
®
1.16754.9010 Water GR for
analysis
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