NeuLog NUL-240 Manual De Instrucciones página 20

Technical notes:
 All standard solutions should be prepared fresh.
 The standard solutions should be at the same
temperature as the sample.
 Use ISA in all solutions (also recommended for the
measured sample).
Note: ISA is added to all solutions to ensure the
samples and standard solutions have the same ionic
strength; the ratio is 1:50.
Electrode preparation
1. Remove the protective cap encasing the ammonium
probe's electrode.
CAUTION: Do not touch the PVC membrane at the
end of the probe with your fingers.
2. Rinse the electrode with deionized water and blot
dry. Be sure not to rub as this will harm the sensor.
3. Soak the electrode in deionized water for 10 minutes,
then in a diluted ammonium standard solution
(0.0001 M or 1 ppm) for two hours until ready for use.
4. For preparing the 1 ppm standard solution, mix one
drop of the 1000 ppm standard solution with 20
drops of ISA and add deionized water up to a total of
40 ml solution (assuming one drop equals 0.04 ml). It
is also possible to use a micropipette if available.
V2018.02
20
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