eutech-instruments silversulfide epoxy Manual De Usuario
Silver/Silver Sulfide Electrode
Instruction Manual
16
5.
Add 1 ml of titrant and record the mV reading after stabilization. Repeat this operation
four more times.
four more times.
6.
Using Gran's Plot paper, plot the values as follows:
a) The horizontal axis is the volume axis. Each major division is equal to 1 ml of titrant
used.
b) The vertical axis is the mV axis. Each major division is equal to 5 mV. The axis
should be scaled so that the mV value obtained after 5 ml of titrant added is near the
top of the graph.
top of the graph.
7.
After drawing a straight line through the points, the line should intersect the horizontal axis
at 0 ml. (See Figure 4.)
at 0 ml. (See Figure 4.)
8.
Measure out 100 ml of the sample into a 150 ml beaker, add 1 ml of low level ISA, place
the beaker on the magnetic stirrer, and begin stirring.
the beaker on the magnetic stirrer, and begin stirring.
9.
Prepare a 10 ml burette with the low level chloride titrant mentioned in Step 3 above.
10. Allow the titrant to run slowly into the sample until the mV reading is near the value
recorded for the first 1 ml increment added in Step 5 above. Record the mV reading and
the total volume added.
the total volume added.
11.
Add 1 ml increments of titrant and record the mV reading vs the total volume until the mV
reading approaches the highest mV reading recorded in Step 5 above.
reading approaches the highest mV reading recorded in Step 5 above.
12.
Plot the mV reading vs total volume for all points on the Gran's Plot paper. Draw a straight
line through as many points as possible, extending the line to the horizontal axis. The
volume intercept value is equal to the chloride concentration in ppm.
line through as many points as possible, extending the line to the horizontal axis. The
volume intercept value is equal to the chloride concentration in ppm.
Indicator Titration
A special method for measuring low level cyanide concentration. The silver/sulfide electrode is
capable of cyanide measurements down to 0.03 ppm.