Metrohm viva 1.1 - Manual (Page 1056)

9.3 Frequently asked questions
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viva 1.1
9.3 Frequently asked questions
Question Answer
How often should the dos-
ing units be prepared? The dosing units used must be prepared
at least once a day before measurement
begins. This ensures that fresh solution is
used for the analysis.
What preparatory steps
need to be taken before
shutting down the measur-
ing system? All dosing units used should be rinsed
with distilled water in order to prevent a
possible crystallization of metal salts.
At what intervals should a
dosing unit be cleaned? The dosing units used for the voltamme-
try commands should be disassembled
and thoroughly cleaned at 14-day inter-
vals.
How often should mainte-
nance procedures be per-
formed on the reference
electrode? The reference electrolyte must be
replaced daily. The bridge electrolyte
should be replaced every other day. The
multimedia guide "Electrodes in Voltam-
metry" contains a comprehensive video
tutorial on this topic.
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.