Metrohm viva 1.0 Manual - Manual (Page 876)

9.3 Frequently asked questions
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viva 1.0
Question Answer
How should the electrodes
be stored? Auxiliary, reference and working elec-
trodes should be stored in distilled water.
Storage in VMS is not recommended.
If the measuring system is not used for an
extended period (>24 h), then the refer-
ence electrode should be stored sepa-
rately in c(KCL) 3 mol/L. The other elec-
trodes can also be stored dry.
The auxiliary electrode or
the working electrode
show copper deposits.
How can these copper
deposits be removed? Dip the auxiliary or working electrode into
concentrated nitric acid for 1 to 2 sec-
onds to redissolve the copper. After-
wards, clean the electrode thoroughly
with distilled water.
How frequently do the
electrodes need to be con-
ditioned? It is advisable to condition the electrodes
at least once a day before you start work.
The measuring signal in Cu
VMS is exceptionally small
and conditioning in Cu
VMS takes a long time.
What is the reason for
that? Most likely, the VMS in the measuring
vessel is contaminated. The contamina-
tion might have been caused by the
chemicals used but also by organic addi-
tives.
The measurement curves
are noisy. What is the rea-
son for that? The driving axle is defective and needs to
be replaced.
Can measurements from
another software be used
in viva? No, this is not possible.