Hanna Instruments HI 4111 User manual

HI 4011HI 4011

HI 4011

HI 4111HI 4111

HI 4111

Iodide Ion

Selective Electrode

Instruction Manual

Half-cell

Combination

IODIDE

HI 4011

HI 4111

IODIDE

COMBINATION

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 Electrode

I.I.

I. Introduction:Introduction:

Introduction:Introduction:

Introduction:

The Hanna HI 4011 and HI 4111 are ion selective elec-

trodes 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

II.

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

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 potentiomet-

ric devices used for the rapid determination of free Iodide

ions in food products, plants, and as an indicator in titra-

tions. The electrode functions as a sensor or ionic conductor.

The HI 4011 requires a separate reference electrode to com-

plete its electrolytic circuit. The HI 4111 incorporates a

reference electrode. The Silver Iodide pellet is practically

insoluble in the test solutions being measured and pro-

duces 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= Ea + 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)

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

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

IODIDE

HI 4011

Cap

Sensing

Membrane

Sensor

Handle

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 bea-

kers 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. 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 dilu-

tions 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 4011-

01: Pipette 100 mL standard to a 1 liter volumetric flask.

Add deionized water to volume. Using additional volumet-

ric pipettes and glassware make serial dilutions of this

1269 ppm standard to approximately bracket the concen-

tration 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.

VIIVII

VII. General GuidelinesGeneral Guidelines

General GuidelinesGeneral Guidelines

General Guidelines

•Calibration standards and sample solutions should

have the same ionic strength. ISA should be added to

both samples and standards in the same ratio. 1 part

ISA to 50 parts standard is the normal dosing.

•Concentrated samples (>1 M) should be diluted

before measurement. Multiply the final result by the

corresponding dilution factor.

•For high ionic strength samples, prepare standards

with similar ionic strength by increasing the quantity

of ISA used or use standard addition or titration.

•Calibration standards and sample solutions should

be at same temperature.

•The magnetic stirrer may generate heat. Thermally

insulate beaker containing standard or sample from

magnetic stirrer by placing cork or other insulative

sheet between beaker and stirrer plate.

•Calibration standards and sample solutions should

be stirred at the same rate using identical sized TFE

coated stir bars.

•Rinse electrode pair with distilled or deionized water

between samples and gently dab dry with soft dis-

posable absorbent toweling. Do not rub electrodes.

•Presoaking Iodide sensor in a dilute standard will

optimize response. Use concentrations approximately

10-3 M or less.

•A scratched, pitted, or tarnished pellet surface can

cause drift, a loss of low level response, or poor repeat-

ability. Optimum response can be restored by remov-

ing the damaged surface with the microabrasive strip

HI 4000-70.

•Avoid large changes in temperature (thermal shock)

as it may damage the sensor.

•Gas bubbles may form from solution out-gassing due

to temperature change. Gently tap body of sensor to

dislodge them from membrane surface.

HI 4011

•Remove protective cover from sensor tip.

•Prepare HI 5315 reference electrode by filling electro-

lyte reservoir with HI 7072 fill solution.

•Place sensor and reference electrodes into electrode

holder and connect cable connectors to meter.

HI 4111

•Remove the protective plastic wrap that covers the

ceramic junction before assembling sensor for the first

time.

•HI 7072 reference fill solution should be added daily

to electrolyte reservoir before electrode use.

•During measurement always operate electrode with

the fill hole open.

•During normal use, fill solution will slowly drain out

of the tapered cone junction at the lower portion of the

electrode. Excessive loss (>4 cm drop within 24 hours)

is not normal. If this occurs verify cap is tightened and

the interface between the internal cone and outer

body is free of debris.

•Add fill solution daily to maintain a good head pres-

sure. For optimum response, this level should be main-

tained and not be allowed to drop more than 2-3 cm

(1-inch) below fill hole. It must cover the ceramic

found on the inner stem.

•If an erratic measurement occurs, check to see if for-

eign matter is seen trapped near the internal cone.

Drain and refill with fresh fill solution.

VIII.VIII.

VIII. Electrode PreparationElectrode Preparation

Electrode PreparationElectrode Preparation

Electrode Preparation

HI 4011

1. Remove protective cover from sensor tip.

2. Prepare reference electrode by filling outer electrolyte

reservoir with HI 7072.

3. Place sensor and reference electrodes into electrode

holder and connect cable connectors to meter.

HI 4111

1. Unwrap plastic film seal found over ceramic junction

on inner stem and discard. This is only used for ship-

ping and long term storage.

2. Rinse inner stem with deionized water making certain

to wet the o-ring found on the inner stem.

3. Reassemble electrode by gently pushing the inner

assembly into the outer body, sliding spring down

cable, and screwing cap into place.

4. Remove fill hole cover and o-ring on fill hole spout.

5. Using the dropper pipette provided, add a few drops

HI 7072 fill solution to the electrode, wetting the o-

ring and rinsing out the fill solution chamber.

Deionized

Water

Remove

Parafilm

6. Holding the body of the electrode gently press upper

cap with your thumb. This permits the fill solution to

drain out of the body. Release cap and verify elec-

trode returns to its original position. (You may need to

gently assist for this to occur).

7. Tighten the electrode cap onto the body and fill elec-

trode body until fill solution volume is just below fill

hole.

8. Position electrode in a Hanna HI 76404 electrode

holder (or equivalent) and connect plug to meter.

HI 4111

IODIDE

COMBINATION

IX.IX.

IX. Quick Check of Electrode SlopeQuick Check of Electrode Slope

Quick Check of Electrode SlopeQuick Check of Electrode Slope

Quick Check of Electrode Slope

•Connect sensors to pH/mV/ISE meter

•Place meter in mV mode.

•Place 100 mL of DIW into a beaker with stir bar.

•Place electrodes into prepared sample.

•Add 1 mL of a standard 0.1 M (12690 ppm) stan-

dard to beaker. Record the mV value when stable.

•Add an additional 10 mL of standard to the solution.

Record the mV when reading has stabilized. This

value should be less than the previous noted (more

negative).

•Determine the difference between the two mV values.

An acceptable value for this slope is -56 ± 4 mV.

X.X.

X. Corrective actionCorrective action

Corrective actionCorrective action

Corrective action

•Verify protective cap has been removed (HI 4011).

•Verify plastic film has been removed from inner stem

(HI 4111).

•Verify electrodes are connected properly to meter and

meter is powered.

•Verify dilute standards are freshly made and stored.

Remake solutions if appropriate.

•If the sensor slope just misses the suggested slope

window, soaking the sensor in a dilute standard may

solve the problem. (<10-3 M Iodide or <126 ppm

standard).

•A scratched sensing surface can be polished with HI

4000-70 polishing strip. Cut off approximately 1

inch of the micro-abrasive strip. Wet the frosted side

with deionized water and place against damaged

membrane of the electrode. Place your thumb against

the shiny backing and slowly rotate back and forth

while applying gentle pressure. Continue polishing

until you are satisfied with the surface. If dark depos-

its appear on polishing strip move the paper slightly

and continue polishing.

This manual suits for next models

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