Hanna Instruments HI 4014 User Manual
Instruction Manual
HI 4114
POTASSIUM
COMBINATION
HI
4000-50
SENSOR HANDLE
HI 4014HI 4014
HI 4014
HI 4014HI 4014
HI 4114HI 4114
HI 4114
HI 4114HI 4114
Potassium Ion
Selective Electrode
Half-cell
Combination
1
HI 4014 PHI 4014 P
HI 4014 P
HI 4014 PHI 4014 P
HI 4114 PHI 4114 P
HI 4114 P
HI 4114 PHI 4114 P
I.I.
I.
I.I.
The Hanna HI 4014 and HI4114 are ion selective elec-
otassium half-cellotassium half-cell
otassium half-cell
otassium half-cellotassium half-cell
otassium combination electrodeotassium combination electrode
otassium combination electrode
otassium combination electrodeotassium combination electrode
IntroductionIntroduction
Introduction
IntroductionIntroduction
trodes designed for the measurement of potassium ions in
aqueous solutions. They utilize a replaceable sensing module that contains an organic polymer membrane that is
sensitive to potassium. HI 4014 is a half-cell electrode that
requires a separate reference.
HI 4114 is a combination ion selective electrode.
IIII
SpecificationsSpecifications
II.
Specifications
IIII
SpecificationsSpecifications
Type: PVC membrane with
organic ion exchanger
Ion measured: Potassium (K+)
Measurement range: 1M to 1X 10-6M
39100 to 0.039ppm
Interference:
Organic solvents andcationic detergents must be absent.
Ratio of interfering ion to K+ must be below
10 for NH
300 for Li
2000 for Na
2000 for Ca
+
4
+
+
2+
Operating Temperature: 0-40°C
III.III.
Theory of Operation:Theory of Operation:
III.
Theory of Operation:
III.III.
Theory of Operation:Theory of Operation:
The HI 4014 and HI 4114 potassium electrodes are potentiometric devices used for the rapid determination of free
potassium ions in water, soft drinks, wine, and soils. The
electrode functions as a sensor or ionic conductor. HI 4014
requires a separate reference electrode to complete its electrolytic circuit. HI 4114 is a combination electrode with a
reference electrode incorporated in its design. The PVC membrane used on the sensor is impregnated with the organic
ion exchanger valinomycin. This carrier ionophore encloses
the ion like a cage. The outside of the ionophore molecule
is uncharged and it can freely diffuse through the lipid
layers of the membrane producing a charge imbalance
between the test solution and internal cell of the sensor.
This produces a voltage that changes in response to the
sample’s ion activity. When the ionic strength of the sample
is fixed, the voltage is proportional to the concentration of
potassium ions in solution. The sensor follows the Nernst
Equation:
E = E
+ 2.3 RT/nF log A
a
ion
E = observed potential
Ea = Reference and fixed internal voltages
R = gas constant (8.314 J/K Mol)
n= Charge on ion (equivalents/mol) (1+)
Operating pH: 1.5 to 12.0 pH
Dimensions: 12 mm (OD)(0.47”) X
120 mm (4.72”)
(insertion)
Connection: BNC
2
A
= ion activity in sample
ion
T = absolute temperature in K
F = Faraday constant (9.648 x 104 C/equivalent)
3
IV. IV.
Design elements of the HI 4014 and HI 4114Design elements of the HI 4014 and HI 4114
IV.
Design elements of the HI 4014 and HI 4114
IV. IV.
Design elements of the HI 4014 and HI 4114Design elements of the HI 4014 and HI 4114
electrodeselectrodes
electrodes
electrodeselectrodes
Cap
HI
4000-50
HANDLE
R
SENSO
Sensor
Handle
O-Ring
V. V.
Equipment Required:Equipment Required:
V.
Equipment Required:
V. V.
Equipment Required:Equipment Required:
• HI 4014 requires the Hanna HI 5315 Double Junction
reference electrode with HI 7076 as external electrolyte.
• 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
magnetic stirring bars (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.
Sensing
module
Upper Cap
Upper
Threads
O-Ring
Ceramic Junction
on Inner Stem
Liquid junction
Spring
Fill Hole
O-Ring and
Plug
Outer Sleeve
Sensing Module
VI. VI.
Solutions Required for PSolutions Required for P
VI.
Solutions Required for P
VI. VI.
Solutions Required for PSolutions Required for P
mentsments
ments
mentsments
0.1 M potassium standard, 500 mL
Ionic Strength Adjuster, 500 mL
otassium Measure-otassium Measure-
otassium Measure-
otassium Measure-otassium Measure-
HI 4014-01HI 4014-01
HI 4014-01
HI 4014-01HI 4014-01
HI 4014-00HI 4014-00
HI 4014-00
HI 4014-00HI 4014-00
Using volumetric pipettes and glassware make dilutions to
bracket the concentration of the samples. Standards with
concentrations <10
-3
M should be prepared daily.
Store standards in plastic bottles. Add 2 mL of Hanna ISA
HI 4014-00 to 100 mL sample or standard.
4
5
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