C
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N R
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. D
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20
18
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Solution preparation
Reagent Solution –
5M (20% W/V) Sodium Hydroxide
The solution used to fill the reagent container is made up as shown
below – consumption is approximately 250 ml in 2 to 4 weeks.
1. Weigh out 2.5 (±0.1) g EDTA and transfer to a 500 ml (16.9 fl
oz) measuring flask (a little high purity water can be used to
help this transfer).
2. In a separate vessel, weigh out 100 (±1) g sodium hydroxide,
NaOH, pellets (analytical reagent grade) and dissolve in
approximately 300 ml (10.0 fl oz) high purity water in a plastic
container. Allow this solution to cool.
3. Transfer this solution to the measuring flask, shake well to
dissolve the EDTA and top up to the mark with more high
purity water.
Standard solution
Choose a convenient value for the hydrazine concentration of the
standard solution – typically 50 or 80 µg kg
-1
. Other concentrations
can be used if required.
Prepare a stock solution of 1000 mg l
-1
hydrazine as follows:
1. Weigh out 4.058 (±0.001) g analytical reagent grade
hydrazine sulphate (N
2
H
4
,H
2
SO
4
) and dissolve in
approximately 800 ml (27.0 fl oz) high purity water.
2. Transfer to a 1 l (33.81 fl oz) volumetric flask and top up to
the mark with more high purity water.
3. Dilute the stock solution to provide the required standard
solution for the particular measuring range (usually 30 or
80 µg kg
-1
).
Warning.
Sodium Hydroxide is extremely caustic and must be
handled with great care. Wear gloves and eye protection.
Warning.
Hydrazine sulphate is an irritant to skin and eyes.
Avoid breathing the dust. Wear gloves, eye protection and a
dust mask when handling this substance.
Note.
Hydrazine solutions deteriorate with time: replace the
stock solution at monthly intervals. Dilute standard solutions
must be freshly prepared.
