Hanna Instruments HI 4002 User Manual

BROMIDE

HI 4002

HI 4102

BROMIDE

COMBINATION

Instruction Manual

HI 4002HI 4002

HI 4002

HI 4002HI 4002 HI 4102HI 4102

HI 4102

HI 4102HI 4102

Bromide Ion

Selective Electrode

Half-cell Combination

HI 4002 Bromide Half-cellHI 4002 Bromide Half-cell

HI 4002 Bromide Half-cell

HI 4002 Bromide Half-cellHI 4002 Bromide Half-cell HI 4102 Bromide Combination ElectrodeHI 4102 Bromide Combination Electrode

HI 4102 Bromide Combination Electrode

HI 4102 Bromide Combination ElectrodeHI 4102 Bromide Combination Electrode

I. I.

Introduction:Introduction:

Introduction:

I. I.

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

SpecificationsSpecifications

II.

Specifications

IIII

SpecificationsSpecifications

Type: Solid State electrode with

a Silver Bromide pellet.

- -

Ion(s) measured: Bromide (Br

- -

)

Measurement range: 1.0 M to 1 X 10

-6

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

0.01 for CN 50 for Cl

iodide

cyanide

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: BNC

III. III.

Theory of OperationTheory of Operation

III.

Theory of Operation

III. III.

Theory of OperationTheory 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

+ 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)

IV. IV.

Design elements of the HI 4002 and HI 4102Design elements of the HI 4002 and HI 4102

IV.

Design elements of the HI 4002 and HI 4102

IV. IV.

Design elements of the HI 4002 and HI 4102Design elements of the HI 4002 and HI 4102

electrodeselectrodes

electrodes

electrodeselectrodes

Cap

HI 4002

IDE

Sensor

BRO

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

V. V.

Equipment required:Equipment required:

Equipment required:

V. V.

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.

Solutions RequiredSolutions Required

VI.

Solutions Required

VI. VI.

Solutions RequiredSolutions Required

for Bromide Measurementsfor Bromide Measurements

for Bromide Measurements

for Bromide Measurementsfor 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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