Hanna Instruments HI 4102 Instruction Manual
1
HI 4002HI 4002
HI 4002HI 4002
HI 4002
HI 4102HI 4102
HI 4102HI 4102
HI 4102
Bromide Ion
Selective Electrode
Instruction Manual
Half-cell
Combination
BROMIDE
HI 4002
HI 4102
BROMIDE
COMBINATION
2
HI 4002 Bromide Half-cellHI 4002 Bromide Half-cell
HI 4002 Bromide Half-cellHI 4002 Bromide Half-cell
HI 4002 Bromide Half-cell
HI 4102 Bromide Combination ElectrodeHI 4102 Bromide Combination Electrode
HI 4102 Bromide Combination ElectrodeHI 4102 Bromide Combination Electrode
HI 4102 Bromide Combination Electrode
I. I.
I. I.
I.
Introduction:Introduction:
Introduction:Introduction:
Introduction:
The Hanna HI 4002and HI 4102 are ion selective electrodes designed for the measurement of Bromide ions in
aqueous solutions. The HI 4002 is a solid state half-cell
sensor that requires a separate reference. The HI 4102 is a
combination ion selective electrode.
IIII
IIII
II.
SpecificationsSpecifications
SpecificationsSpecifications
Specifications
Type: Solid State electrode with
a Silver Bromide pellet.
Ion(s) measured: Bromide (Br
- -
- -
-
)
Measurement range: 1.0 M to 1 X 10
-6
M
79,910 to 0.08 ppm
Interfering ions: Cyanide, and Mercury
must be absent. Ratio of
interfering ion to Br
--
--
-
must
be less than the ratio
indicated below:
0.01 for I
--
--
-
iodide
0.01 for CN
--
--
-
cyanide
50 for Cl
--
--
-
Chloride
Operating Temperature: 0-80°C
Operating pH: 2-12.5 pH
Dimensions: 12 mm (OD) X 120 mm
nominal insertion
(0.47” X 4.72”)
Connection: BN C
3
III. III.
III. III.
III.
Theory of OperationTheory of Operation
Theory of OperationTheory of Operation
Theory of Operation
::
::
:
The HI 4002 or HI 4102 Bromide electrodes are potentiometric devices used for the rapid determination of free Bromide ions in food products, beverages, plants, soils and as
an indicator in titrations. The electrode functions as a sensor or ionic conductor. The HI 4002 requires a separate
reference electrode to complete its electrolytic circuit. The
HI 4102 incorporates a reference electrode. The silver Bromide 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 bromide 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 J/K Mol)
n= Charge on ion (1-)
A i=ion activity in sample
T= absolute temperature in K
F= Faraday constant (9.648 x 104 C/equivalent)
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IV. IV.
IV. IV.
IV.
Design elements of the HI 4002 and HI 4102Design elements of the HI 4002 and HI 4102
Design elements of the HI 4002 and HI 4102Design elements of the HI 4002 and HI 4102
Design elements of the HI 4002 and HI 4102
electrodeselectrodes
electrodeselectrodes
electrodes
BRO
M
IDE
HI 4002
Cap
Sensing
Membrane
Sensor
Handle
Upper Cap
Spring
O-Ring
Ceramic Junction
on Inner Stem
Fill Hole
O-Ring and
Plug
Sensing
Membrane
Outer Sleeve
Upper
Threads
Liquid junction
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 4002.
• 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 Bromide Measurementsfor Bromide Measurements
for Bromide Measurementsfor Bromide Measurements
for Bromide Measurements
0.1 M Bromide Standard, 500 mL HI 4002-01
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 799 ppm bromide standard by diluting HI400201: 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 799
ppm standard to approximately bracket the concentration
of the samples. Standards with concentrations < 80 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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