Xylem ISE Electrodes I 60 - Handbuch (Seite 14)

14
Interferences
• Complexes with Bi
3+
, Cd
2+
, Pb
2+
• reducing agents
• Interfering ions: 10 % error with the following ratios of
concentration:
(Ratio of concentration = Interfering ion / Measuring ion)
Aging
Please note that every electrode undergoes a natural
aging process. The response time increases and the
slope decreases with the age of the electrode. The
following factors shorten the lifetime considerably:
• Incorrect storing
• Special measuring conditions (e.g. organic solutions,
frequent measuring with high concentrations of
interfering ions)
• High temperatures
• High changes in temperature
The warranty does not cover damage caused by
measuring conditions and mechanical damage.
Maintenance
• For combination electrodes: replenish used reference
electrolyte solution.
• In case of increased response times of the electrode
perform the following activities:
–
Polish the membrane surface using an SF/K
polishing strip (see R
ECOMMENDED