Release 06/2014
Spectroquant
®
photometers NOVA 60 and Pharo photometers
Instructions for the Preparation of Standard Solutions
Standard solution of monochloramine
Preparation of a standard solution:
Place 5.0 ml of chlorine standard solution 100 mg/l Cl
2
and 10.0 ml
ammo nium standard solution 10 mg/l NH
4
-N in a calibrated or confor-
mity-checked 100-ml volu metric flask and make up to the mark with dis-
tilled water.
The standard solution prepared according to this procedure has a con-
centration of 5.00 mg/l Cl
2
or 3.63 mg/l NH
2
Cl.
Stability:
The standard solution is not stable and must be used immediately.
Reagents required:
Chlorine standard solution
100 mg/l Cl
2
Preparation see “Standard solution of
free chlorine” with hypochlorite solution
(standard solution that is absolutely ne-
cessary for the preparation of the
monochloramine standard)
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 for
analysis
EMSURE
®
Standard solution of nitrogen (total)
Preparation of a standard solution:
Dissolve 5.36 g of glycine GR with distilled water in a calibrated or con-
formity-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 1000 mg/l total nitrogen.
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 remains stable for one week. The diluted standard solutions
(investigational concentrations) must be used immediately.
Reagents required:
1.04201.0100 Glycine GR for
analysis
1.16754.9010 Water for
analysis
EMSURE
®
Standard solution of oxygen scavengers
Preparation of a standard solution:
Dissolve 1.00 g of N,N-diethylhydroxylamine with distilled water in a cali-
brated 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 1000 mg/l N,N-diethylhydroxylamine (DEHA).
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:
8.18473.0050 N,N-Diethylhy-
droxylamine for
synthesis
1.16754.9010 Water for
analysis
EMSURE
®
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