Thermo Fisher Scientific Ion Selective Electrodes Chloride User Manual
Page 20
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Instruction Manual
Chloride Electrode
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
"Incorrect Answer" incorrect scaling
plot millivolts on the linear
(but calibration
of 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 conversion factor:
1.0x10
-3
M = 35.5 ppm as Cl-
complexing agents
remove complexing agent
20
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