Hanna Instruments HI 4109 Instruction Manual

CYANIDE

HI 4009

HI 4109

CYANIDE

COMBINATION

Instruction Manual

HI 4009HI 4009

HI 4009

HI 4009HI 4009 HI 4109HI 4109

HI 4109

HI 4109HI 4109

Cyanide Ion

Selective Electrode

Half-cell Combination

HI 4009 Cyanide Half-cellHI 4009 Cyanide Half-cell

HI 4009 Cyanide Half-cell

HI 4009 Cyanide Half-cellHI 4009 Cyanide Half-cell HI 4109 Cyanide Combination ElectrodeHI 4109 Cyanide Combination Electrode

HI 4109 Cyanide Combination Electrode

HI 4109 Cyanide Combination ElectrodeHI 4109 Cyanide Combination Electrode

I. I.

Introduction:Introduction:

Introduction:

I. I.

Introduction:Introduction: The Hanna HI 4009 and HI 4109 are ion selective electrodes designed for the measurement of Cyanide ions in aqueous solutions. The HI 4009 is a solid state half-cell sensor that requires a separate reference. The HI 4109 is a combination ion selective electrode.

IIII

SpecificationsSpecifications

II.

Specifications

IIII

SpecificationsSpecifications

Type: Solid State electrode with

a Silver halide pellet.

- -

Ion(s) measured: Cyanide (CN

- -

)

Measurement range: 10

-2

M to 1X 10

-6

260 to 0.26 ppm

Interfering ions: Silver, Sulfide and

Mercury must be absent. Ratio of interfering ion to

must be less than the

ratio indicated below:

1.0 for I 500 for Br 500 for Cl

Iodide

Bromide

Chloride

Operating Temperature: 0-80°C

Operating pH: 11 to 14 pH

(recommended)

Dimensions: 12 mm (OD) X 120 mm

nominal insertion (0.47” X 4.72”)

Connection: BNC

WARNING: HCN GAS IS TOXIC IF BREATHED, OR ABSORBED THROUGH SKIN. USE OF A HOOD AND PROTECTIVE CLOTHING IS STRONGLY ADVISED. USE ISA TO ADJUST pH ABOVE 11.

III. III.

Theory of OperationTheory of Operation

III.

Theory of Operation

III. III.

Theory of OperationTheory of Operation

:: The HI 4009 or HI 4109 Cyanide electrodes are potentiometric devices used for the rapid determination of free Cyanide ions in effluent, for electroplating bath analysis and as a detector for titration of cyanide with silver nitrate. The electrode functions as a sensor or ionic conductor. The HI 4009 requires a separate reference electrode to complete its electrolytic circuit. The HI 4109 incorporates a reference electrode. The silver halide 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 Cyanide 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 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.

Design elements of the HI 4009 and HI 4109Design elements of the HI 4009 and HI 4109

IV.

Design elements of the HI 4009 and HI 4109

IV. IV.

Design elements of the HI 4009 and HI 4109Design elements of the HI 4009 and HI 4109

electrodeselectrodes

electrodes

electrodeselectrodes

Cap

HI 4009

Sensor Body

Sensing Membrane

Upper Cap

Upper Threads

O-Ring

CYANIDE

Spring

Fill Hole

Ceramic Junction on Inner Stem

Liquid junction

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 4009.

• 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 Cyanide Measurementsfor Cyanide Measurements

for Cyanide Measurements

for Cyanide Measurementsfor Cyanide Measurements

ISA, 500 mL HI 4001-00 User supplied standards:

Note: These solutions should only be used for making more dilute standards. The sensing surface will be damaged if submersed in this high a concentration.

Molar Stock solution:

0.01M stock solution (1 Liter): To a one liter volumetric flask add approximately 300 mL deionized water and 10mL of HI 4001-00 ionic strength (pH) adjuster. On an analytical balance weigh 0.490g of dry NaCN salt and transfer to the volumetric flask. Swirl contents until dissolved. Add deionized water to bring the flask to its 1 liter calibrated mark. Mix thoroughly and store in tightly capped plastic bottle. ppm stock solution: 1000 ppm stock solution (1 Liter): To a one liter volumetric flask add approximately 300 mL deionized water and 10 mL of HI 4001-00 ionic strength (pH) adjuster. On an analytical balance weigh 1.88g of dry NaCN salt and transfer to the 1-liter volumetric flask. Swirl contents until dissolved. Add deionized water to bring the flask to its 1 liter calibrated marking. Mix thoroughly and store in tightly

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