Thermo Fisher Scientific Ion Selective Electrodes Copper - Manual (Page 24)

24
in solution in solution
Noisy or Unstable
defective meter check meter with
Readings (readings shorting strap
continuously or
rapidly changing)
air bubble on remove bubble by
membrane redipping electrode
electrode exposed soak electrode in
to interferences cupric standard
defective electrode replace electrode
ISA not used use recommended ISA
meter or stirrer ground meter or
not grounded stirrer
Drift (reading
samples and standards allow solutions to
slowly changing at different come to room temper-
in one direction) temperatures ature before
measurement
electrode exposed check section
to complexing entitled
agents Precipitation and
Complexation
incorrect reference use recommended
filling solution filling solution
Low Slope or
standards contamin- prepare fresh
No Slope ated or incorrectly standards
made
ISA not used use recommended
ISA
standard used as ISA use ISA
electrode exposed check section
to complexing agents entitled
Precipitation
and Complexation
air bubble on remove bubble by
membrane redipping probe
"Incorrect Answer"
incorrect scaling plot millivolts on
(but calibration of semi-log paper the linear axis. On
curve is good) the log axis, be