Hanna Instruments HI 4111 Instruction Manual

1

HI 4011HI 4011

HI 4011HI 4011

HI 4011
HI 4111HI 4111

HI 4111HI 4111

HI 4111

Iodide Ion

Selective Electrode

Instruction Manual

Half-cell
Combination

IODIDE

HI 4011

HI 4111

IODIDE

COMBINATION

2

HI 4011 Iodide Half-cellHI 4011 Iodide Half-cell

HI 4011 Iodide Half-cellHI 4011 Iodide Half-cell

HI 4011 Iodide Half-cell
HI 4111 Iodide Combination ElectrodeHI 4111 Iodide Combination Electrode

HI 4111 Iodide Combination ElectrodeHI 4111 Iodide Combination Electrode

HI 4111 Iodide Combination Electrode

I. I.

I. I.

I.

Introduction:Introduction:

Introduction: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

IIII

II.

SpecificationsSpecifications

SpecificationsSpecifications

Specifications

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

--

--

-

Bromide

500 for Cl

--

--

-

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

3

III. III.

III. III.

III.

Theory of OperationTheory of Operation

Theory of OperationTheory of Operation

Theory 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

a

+ 2.3 RT/nF log 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)

4

IV. IV.

IV. IV.

IV.

Design elements of the HI 4011and HI 4111Design elements of the HI 4011and HI 4111

Design elements of the HI 4011and HI 4111Design elements of the HI 4011and HI 4111

Design elements of the HI 4011and HI 4111

electrodeselectrodes

electrodeselectrodes

electrodes

Upper Cap

Spring

O-Ring

Ceramic Junction
on Inner Stem

Fill Hole

O-Ring and
Plug

Sensing
Membrane

Outer Sleeve

Upper
Threads

Liquid junction

IO

DIDE

HI 4011

Cap

Sensing
Membrane

Sensor
Handle

5

V. V.

V. V.

V.

Equipment required:Equipment required:

Equipment required: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.

VI. VI.

VI.

Solutions RequiredSolutions Required

Solutions RequiredSolutions Required

Solutions Required

for Iodide Measurementsfor Iodide Measurements

for Iodide Measurementsfor Iodide Measurements

for 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.