Thermo Fisher Scientific Ion Selective Electrodes Bromide - Manual (Page 18)

Instruction Manual Bromide Electrode
18
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
curve is good) sure concentration numbers
within each decade are
increasing with increasing
concentration.
incorrect sign be sure to note sign of
millivolt number correctly
incorrect standards prepare fresh standards
wrong units used apply correct correction factor:
10
-3
M = 79.9 ppm as Br
-1
complexing agents check section entitled
in sample
Complexation