EUTECH INSTRUMENTS SILVERSULFIDE EPOXY Instruction Manual page 25

Instruction Manual
Low Slope or
No Slope
"Incorrect Answer"
(but calibration
standards contaminated
or incorrectly made
ISA not used
standard used as ISA
electrode exposed
to complexing agents
air bubble on membrane
incorrect scaling of
semi-log paper
incorrect sign
incorrect standards
wrong units used
complexing agents
in sample
25
Silver/Silver Sulfide Electrode
prepare fresh standards
use recommended ISA
use ISA
check section entitled
Complexation
remove bubble by
re-dipping probe
plot millivolts on the linear
axis. On curve is good)
the log axis, be sure that
concentration numbers
within each decade are
increasing with increasing
concentration
be sure to note sign of
millivolt number correctly
prepare fresh standards
apply correct conversion
factor:
-3
1.0X10 M= 32.1 ppm S
-3 -2
= 2.0X10 N (S );
+1
= 108 ppm Ag
check section entitled
Complexation
-2