Maintenance; Chemical Solutions; Reagent Solution - 5M (20% W/V) Sodium Hydroxide; Standard Solution - ABB Navigator 550 Operating Instructions Manual

Navigator 500
Hydrazine analyzer

8 Maintenance

8.1 Chemical solutions

Warning. Sodium Hydroxide is extremely caustic and must
be handled with great care. Wear gloves and eye protection.
The following standard solutions are required to maintain the
wet-section in operation. Solutions must be stored in plastic
bottles and, where possible, should be freshly made.
Fig. 8.1 identifies solution tanks, filler points and QD couplings.
Standard
Solution 2
(High) tank –
400 ml
(0.10 US gall.)
QD coupling at
Standard
Solution 2
(High) tank
Fig. 8.1 Solution tanks
8.1.1 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.
OI/AHM550–EN Rev. A
Filler caps
Reagent
Solution
tank –
200 ml
(0.05 US gall.)
QD coupling at
Navigator 500
Reagent
solution tank

8.1.2 Standard solution

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.
Choose a convenient value for the hydrazine concentration of
the standard solution – typically 50 or 80 µg kg
concentrations can be used if required.
Note. Hydrazine solutions deteriorate with time: replace the
stock solution at monthly intervals. Dilute standard solutions
must be freshly prepared.
Prepare a stock solution of 1000 mg l
1. Weigh out 4.058 (±0.001) g analytical reagent grade
hydrazine sulphate
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
-1
80 µg kg ).

8.2 Scheduled servicing

The procedure outlined is a guide to the maintenance
requirements of the wet-section. The actual servicing schedule
depends on the particular installation and sample conditions.

8.2.1 Weekly

1. Check level of solution in the reagent container. When the
level is near the bottom of the container remove the
container from wet-section, empty contents, rinse with
high purity water and refill with reagent. Clean up any
spillages.
Reagent and calibration solutions are connected to their
respective tubes using valved QD couplings.
Warning. It is imperative that all leaks of potentially
aggressive chemical solutions receive attention as
soon as possible and all spillages are cleaned up.
2. Perform a calibration as described in Section 5, page 23.
-1
. Other
-1 hydrazine as follows:
(N H ,H SO ) and dissolve
2 4 2 4
in
53