Maintenance
41
Waltron User Manual 101-045-E.1
9031CX Sodium Analyzer
4
MAINTENANCE
4.1
BUFFER SOLUTION(S)
WARNING
These buffers are mildly toxic and hazardous, and should be handled with
care.
Two alternative reagent solutions may be used, depending on the required lower limit of measurement.
Concentrated ammonia solution, which provides adjustment of sample pH to 10.7 is suitable for
measurements of sodium ion to approximately 0.5ppb. At concentrations below 0.5ppb, hydrogen ion
interference becomes significant and a reagent of 50% diethylamine solution should be used. This adjusts
the sample pH to 11.2 - 11.5 and enables measurements to be made to concentrations below 0.5ppb.
4.1.1
CONCENTRATED AMMONIA SOLUTION - 1 LITER
WARNING
This buffer should only be handled under a fume hood. It causes burns and
is irritating to the eyes, respiratory system and skin. Wear rubber gloves and
eye protection. In warm weather pressure increases in the bulk container of
ammonia and the cap must be released with care.
Waltron uses a 28 - 30% w/v solution (0.89 s.g.) which is recommended. Refer to section 5.7 which
relates to sodium concentration and pH.
ATTENTION
Waltron offers Ammonium Hydroxide in a 2.5 liter container. Part N1234-116.
4.1.2
DIISOPROPYLAMINE SOLUTION - 99%
WARNING
Diisopropylamine is an extremely inflammable and irritating colorless liquid
with a strong smell of ammonia. It should be handled with care at all times.
The following points should also be noted:
Avoid breathing vapor and avoid contact with skin and eyes.
Work under a fume hood, wearing rubber gloves and eye protection.
In the event of a fire, extinguish with water spray, foam, dry powder or
carbon dioxide.
If a spill occurs, shut off all possible sources of ignition, and instruct others
to keep at a safe distance. Mop up spill with plenty of water, diluting
greatly. Ventilate the area well to evaporate any remaining liquid and
dispel vapor.
Effluent from the monitor contains diisopropylamine (if this buffer is used). Contact with it should also
be avoided.
Allow solution it to cool to room temperature before fitting the container cap.
