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XXV
Release 05/04
Standard solution of total nitrogen
Preparation of a standard solution:
Dissolve 5.36 g of glycine GR with distilled water
in a calibrated or conformity-checked 1000-ml
volumetric flask and make up to the mark with
distilled water. The stock solution prepared
according to this procedure has a concentration
of 1000 mg/l total nitrogen.
Further investigational concentrations may be
prepared from this stock solution by diluting
accordingly.
▼
Stability:
When stored in a cool place (refrigerator), the
stock solution remains stable for one week. The
diluted investigational concentrations must be
used immediately.
▼
Reagents required:
1.04201.0100 Glycine GR for analysis
1.16754.9010 Water GR for analysis
Standard solution of ozone
acc. to DIN EN ISO 7393
Preparation of a KlO
3
stock solution:
Dissolve 1.005 g of KlO
3
in 250 ml of distilled
water in a calibrated or conformity-checked
1000-ml volumetric flask. Subsequently make up
to the mark with distilled water.
▼
Preparation of a KlO
3
/Kl standard solution:
Transfer 14.8 ml of the KlO
3
stock solution to a
calibrated or conformity-checked 1000-ml
volumetric flask, add approx. 1g of Kl and make
up to the mark with distilled water.
1 ml of this solution is equivalent to 0.010 mg
of ozone.
▼
Preparation of the ozone standard solution:
Pipette 20 ml KlO
3
/Kl standard solution into a
calibrated or conformity-checked 100-ml
volumetric flask, add 2.0 ml of H
2
SO
4
0.5 mol/l,
leave to stand for 1 min, and then add NaOH 2
mol/l dropwise (approx. 1 ml) until the solution
just loses its colour. Subsequently make up the
solution to the mark with distilled water.
The concentration of the solution is 2.00 mg/l
ozone.
▼
Stability:
The KlO
3
stock solution remains stable for 4
weeks when stored in a cool place. The KlO
3
/Kl
standard solution can be used for 5 hours when
stored in a cool place. The dilute ozone
standard solution is not stable and must be used
immediately.
▼
Reagents required:
1.02404.0100 Potassium iodate, volum. standard
1.05043.0250 Potassium iodide GR for analysis
1.09072.1000 Sulfuric acid 0.5 mol/l
1.09136.1000 Sodium hydroxide solution 2 mol/l
1.16754.9010 Water GR for analysis
Instructions for the Preparation of Standard Solutions
Standard solution monochloramine
Preparation of a standard solution:
Place 5.0 ml of chlorine standard solution and
10.0 ml ammonium standard solution in a
calibrated or conformity-checked 100-ml
volumetric flask and make up to the mark with
distilled water.
The solution prepared according to this procedure
has a concentration of 5.00 mg/l Cl
2
or 3.63 mg/l
NH
2
Cl.
▼
Stability:
The solution must be used immadiately.
▼
Reagents required:
Chlorine standard solution
100 mg/l Cl
2
Preparation see preparation instruction free
chlorine with hypochlorite solution
Ammonium standard solution
10 mg/l NH
4
-N
Preparation with Ammonium standard solution
CertiPUR
®
, Cat.no. 1.19812.0500, 1000 mg/l NH
4
= 777 mg/l NH
4
-N
1.16754.9010 Water GR for analysis