Hanna Instruments HI 4114 Instruction Manual
1
Instruction Manual
SENSOR HANDLE
HI
4000-50
HI 4114
POTASSIUM
COMBINATION
HI 4014HI 4014
HI 4014HI 4014
HI 4014
HI 4114HI 4114
HI 4114HI 4114
HI 4114
Potassium Ion
Selective Electrode
Half-cell
Combination
2
3
III.III.
III.III.
III.
Theory of Operation:Theory of Operation:
Theory of Operation: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
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 (equivalents/mol) (1+)
A
ion
= ion activity in sample
T = absolute temperature in K
F = Faraday constant (9.648 x 104 C/equivalent)
HI 4014 PHI 4014 P
HI 4014 PHI 4014 P
HI 4014 P
otassium half-cellotassium half-cell
otassium half-cellotassium half-cell
otassium half-cell
HI 4114 PHI 4114 P
HI 4114 PHI 4114 P
HI 4114 P
otassium combination electrodeotassium combination electrode
otassium combination electrodeotassium combination electrode
otassium combination electrode
I.I.
I.I.
I.
IntroductionIntroduction
IntroductionIntroduction
Introduction
The Hanna HI 4014 and HI4114 are ion selective elec-
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
IIII
II.
SpecificationsSpecifications
SpecificationsSpecifications
Specifications
Type: PVC membrane with
organic ion exchanger
Ion measured: Potassium (K+)
Measurement range: 1M to 1X 10-6M
39100 to 0.039ppm
Operating Temperature: 0-40°C
Operating pH: 1.5 to 12.0 pH
Dimensions: 12 mm (OD)(0.47”) X
120 mm (4.72”)
(insertion)
Connection: BNC
Interference:
Organic solvents andcationic detergents must be absent.
Ratio of interfering ion to K+ must be below
10 for NH
4
+
300 for Li
+
2000 for Na
+
2000 for Ca
2+
4
5
V. V.
V. V.
V.
Equipment Required:Equipment Required:
Equipment Required: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.
VI. VI.
VI. VI.
VI.
Solutions Required for PSolutions Required for P
Solutions Required for PSolutions Required for P
Solutions Required for P
otassium Measure-otassium Measure-
otassium Measure-otassium Measure-
otassium Measure-
mentsments
mentsments
ments
0.1 M potassium standard, 500 mL
HI 4014-01HI 4014-01
HI 4014-01HI 4014-01
HI 4014-01
Ionic Strength Adjuster, 500 mL
HI 4014-00HI 4014-00
HI 4014-00HI 4014-00
HI 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.
IV. IV.
IV. IV.
IV.
Design elements of the HI 4014 and HI 4114Design elements of the HI 4014 and HI 4114
Design elements of the HI 4014 and HI 4114Design elements of the HI 4014 and HI 4114
Design elements of the HI 4014 and HI 4114
electrodeselectrodes
electrodeselectrodes
electrodes
SENSO
R
HANDLE
HI
4000-50
Cap
Sensing
module
Sensor
Handle
O-Ring
Upper Cap
Spring
O-Ring
Ceramic Junction
on Inner Stem
Fill Hole
O-Ring and
Plug
Sensing Module
Outer Sleeve
Upper
Threads
Liquid junction
Loading...