Thermo Fisher Scientific Ion Selective Electrodes Cyanide - Manual (Page 17)

Instruction Manual Cyanide Electrode
17
Low Slope or standards contaminated prepare fresh standards
No Slope or incorrectly made
ISA not used use recommended ISA
standard used as ISA use ISA
electrode exposed check section entitled
to complexing agents
Complexation
air bubble on membrane remove bubble by
re-dipping probe
"Incorrect Answer" incorrect scaling of
plot millivolts on the linear
(but calibration semi-log paper axis. On the log axis, be sure
curve is good) concentration numbers within
each decade are increasing
easing concentration.
incorrect sign be sure to note sign
of millivolt number correctly
incorrect standards prepare fresh standards
wrong units used apply correct conversion factor:
10
-3
M = 26.0 ppm CN-
complexing agents check section entitled
in sample
Complexation