Hanna Instruments HI 4011 User Manual

Page 14

An iodide electrode may be used as an indicator to follow
the progress and detect the endpoint of a titration of iodide
containing samples with silver nitrate. The electrode can
be used in colored samples, or high or variable ionic
strength samples to increase accuracy of the determination.
During the titration the sensor follows the decrease in Iodide
concentration while small additions of silver nitrate titrant
are added. The silver reacts with the Iodide ions forming a
precipitate of silver Iodide. At the stoichiometric end point,
a large change in mV occurs. Measurements may be
automated by use of the Hanna Titrator HI 901 or titrated
manually.

XIII.

XIII.pH

The HI 4111 and HI 4011 electrodes may be used in
solutions with pH values between 2 and 13. Samples that
fall beyond this range should be adjusted.

Titration

XIV. S

XIV. Storage and Care of the HI 4011 and

torage and Care of the HI 4011 and

HI 4111 sensors

The HI 4011 sensor can be stored in very dilute standards
(<10

-3

M) for short periods of time and should be stored

dry with the protective cap on when not in use.
The model HI 4111 combination electrode can be left in
dilute standards (<10

-3

M) for short time periods.

For long term storage, the electrode should be drained and
washed of salts with distilled or deionized water. Unscrew
the upper cap and move outer sleeve up cable. Wrap the
ceramic junction on the inner stem with Parafilm

® or other

sealing wrap. Place the protective cap provided over the
sensor membrane. Store dry disassembled electrode in
storage box provided with electrode.

This manual is related to the following products:

HI 4111