Hanna Instruments HI 4011 User Manual
IODIDE
HI 4011
HI 4111
IODIDE
COMBINATION
Instruction Manual
HI 4011HI 4011
HI 4011
HI 4011HI 4011
HI 4111HI 4111
HI 4111
HI 4111HI 4111
Iodide Ion
Selective Electrode
Half-cell
Combination
1
HI 4011 Iodide Half-cellHI 4011 Iodide Half-cell
HI 4011 Iodide Half-cell
HI 4011 Iodide Half-cellHI 4011 Iodide Half-cell
HI 4111 Iodide Combination ElectrodeHI 4111 Iodide Combination Electrode
HI 4111 Iodide Combination Electrode
HI 4111 Iodide Combination ElectrodeHI 4111 Iodide Combination Electrode
I. I.
Introduction:Introduction:
I.
Introduction:
I. I.
Introduction:Introduction:
The Hanna HI 4011 and HI 4111 are ion selective electrodes designed for the measurement of Iodide ions in
aqueous solutions. The HI 4011 is a solid state half-cell
sensor that requires a separate reference. The HI 4111 is a
combination ion selective electrode.
IIII
SpecificationsSpecifications
II.
Specifications
IIII
SpecificationsSpecifications
Type: Solid State electrode with
a Silver Iodide pellet.
- -
-
Ion(s) measured: Iodide (I
- -
)
Measurement range: 1.0 M to 1 X 10-7M
127,000 to 0.01 ppm
Interfering ions: Cyanide and Mercury
must be absent. Strong
reducing solutions will
destroy membrane. Ratio
--
-
of interfering ion to I
--
must
be less than the ratio
indicated below:
` 500 for Br
500 for Cl
--
-
--
Bromide
--
-
--
Chloride
Operating Temperature: 0-80°C
Operating pH: 2.0-13.0 pH
Dimensions: 12 mm (OD) X 120 mm
nominal insertion
(0.47” X 4.72”)
Connection: BNC
2
III. III.
Theory of OperationTheory of Operation
III.
Theory of Operation
III. III.
Theory of OperationTheory of Operation
::
:
::
The HI 4011 or HI 4111 Iodide electrodes are potentiometric devices used for the rapid determination of free Iodide
ions in food products, plants, and as an indicator in titrations. The electrode functions as a sensor or ionic conductor.
The HI 4011 requires a separate reference electrode to complete its electrolytic circuit. The HI 4111 incorporates a
reference electrode. The Silver Iodide pellet is practically
insoluble in the test solutions being measured and produces a potential change due to changes in the sample’s
ion activity. When the ionic strength of the sample is fixed
by the addition of ISA, the voltage is proportional to the
concentration of iodide ions in solution and the electrode
follows the Nernst equation.
E= E
+ 2.3 RT/nF log A
a
ion
E= observed potential
Ea= Reference and fixed internal voltages
R= gas constant (8.314 volt coulomb/K Mole)
n= Charge on ion (1-)
A i=ion activity in sample
T= absolute temperature in K
F= Faraday constant (9.648 x 104 coulomb/mole)
3
IV. IV.
Design elements of the HI 4011and HI 4111Design elements of the HI 4011and HI 4111
IV.
Design elements of the HI 4011and HI 4111
IV. IV.
Design elements of the HI 4011and HI 4111Design elements of the HI 4011and HI 4111
electrodeselectrodes
electrodes
electrodeselectrodes
Cap
HI 4011
DIDE
IO
Sensor
Handle
Sensing
Membrane
Upper Cap
Upper
Threads
O-Ring
Ceramic Junction
on Inner Stem
Liquid junction
Spring
Fill Hole
O-Ring and
Plug
Outer Sleeve
Sensing
Membrane
4
V. V.
Equipment required:Equipment required:
V.
Equipment required:
V. V.
Equipment required:Equipment required:
• Hanna HI 5315 Double Junction Reference Electrode
with HI 7072 Fill Solution for HI 4011.
• Hanna HI 4222 pH/ISE/mV meter or other suitable
ion or pH/mV meter. (Note: log/linear graph paper is
useful if an ISE (ion) meter is not available).
• Hanna HI 180 Magnetic Stirrer or equivalent with TFE
coated stirring bars (HI 731320). Note: isolate beakers from stirrer motor heat by placing insulating
material such as foam or cork between them.
• Hanna HI 76404 Electrode Holder or equivalent.
• Plastic beakers (HI 740036P) or other suitable mea-
surement vessel.
VI. VI.
Solutions RequiredSolutions Required
VI.
Solutions Required
VI. VI.
Solutions RequiredSolutions Required
for Iodide Measurementsfor Iodide Measurements
for Iodide Measurements
for Iodide Measurementsfor Iodide Measurements
0.1 M Iodide Standard, 500 mL HI 4011-01
ISA, 500 mL HI 4000-00
For Molar solutions:
Using volumetric pipettes and glassware make serial dilutions to approximately bracket the concentration of the
samples. Standards with concentrations < 10
-3
M should
be prepared daily.
Two mL of Hanna ISA for Halide electrodes (HI 4000-00)
should be added to 100 mL of sample or standard.
For ppm solutions:
Prepare 1269 ppm iodide standard by diluting HI 401101: Pipette 100 mL standard to a 1 liter volumetric flask.
Add deionized water to volume. Using additional volumetric pipettes and glassware make serial dilutions of this
1269 ppm standard to approximately bracket the concentration of the samples. Standards with concentrations
< 127 ppm should be prepared daily.
Two mL of Hanna ISA for Halide electrodes (HI 4000-00)
should be added to 100 mL of sample or standard.
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