Thermo Fisher Scientific Ion Selective Electrodes Chloride - Manual (Page 20)

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
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