Thermo Fisher Scientific Ion Selective Electrodes Fluoride - Manual (Page 21)

Instruction Manual Fluoride Electrode
- 18 -
to complexing agents
Complexation
air bubble on membrane remove bubble by re-dipping
probe
"Incorrect Answer" incorrect scaling
plot millivolts on the linear axis.
(but calibration of semi-log paper On the log axis, be sure that
curve is good) 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 conversion factor:
10
-3
M = 19 ppm as F
-1
complexing agents check section entitled
in sample Complexation