Hanna Instruments HI 4002, Instruction Manual, Page: 14 / 16

14
A bromide electrode may be used as an indicator to follow
the progress of a bromide tiration with silver nitrate. The
electrode can be used in colored samples where other
indicators suffer from interferences. During the titration the
sensor follows the decrease in bromide concentration while
small additions of silver nitate titrant are added. The silver
reacts with the bromide ions forming a precipitate of silver
bromide. 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.
XIII. XIII.
XIII.pH pH
pH pH
pH
The HI 4102 and HI 4002 electrodes may be used in
solutions with pH values between 2 and 12.5. Samples
that fall beyond this range should be adjusted.
Titration Titration Titration Titration Titration
XIV. S XIV. S XIV. S XIV. S XIV. Storage and Care of the HI 4002 and torage and Care of the HI 4002 and torage and Care of the HI 4002 and torage and Care of the HI 4002 and torage and Care of the HI 4002 and
HI 4102 sensors HI 4102 sensors HI 4102 sensors HI 4102 sensors HI 4102 sensors
The HI 4002 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 4102 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 ot 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.