Hanna Instruments HI 4007 User Manual
CHLORIDE
HI 4007
7
HI 410
CHLORIDE
COMBINATION
Instruction Manual
HI 4007HI 4007
HI 4007
HI 4007HI 4007
HI 4107HI 4107
HI 4107
HI 4107HI 4107
Chloride Ion
Selective Electrode
Half-cell
Combination
1
HI 4007 Chloride Half-cellHI 4007 Chloride Half-cell
HI 4007 Chloride Half-cell
HI 4007 Chloride Half-cellHI 4007 Chloride Half-cell
HI 4107 Chloride Combination ElectrodeHI 4107 Chloride Combination Electrode
HI 4107 Chloride Combination Electrode
HI 4107 Chloride Combination ElectrodeHI 4107 Chloride Combination Electrode
I. I.
Introduction:Introduction:
I.
Introduction:
I. I.
Introduction:Introduction:
The Hanna HI 4007and HI 4107 are ion selective electrodes designed for the measurement of chloride ions in
aqueous solutions. The HI 4007 is a solid state half-cell
sensor that requires a separate reference. The HI 4107 is a
combination ion selective electrode.
IIII
SpecificationsSpecifications
II.
Specifications
IIII
SpecificationsSpecifications
Type: Solid State electrode with
a Silver Chloride pellet.
Ion(s) measured: Chloride (Cl-)
Measurement range: 1.0 M to 5 X 10
-5
M
35,500 to 1.8 ppm
Interfering ions: Cyanide, and Mercury ions
must be absent. Ratio of interfering ion to Cl- must be less
than the ratio indicated below:
for CO
-
2-
3
2-
3
iodide
carbonate
thiosulfate
1.0 for l
3.5 for Br-bromide
1.0 for OH-hydroxide
0.01 for S2O
Operating Temperature: 0-80°C
Operating pH: 2-11 pH
Dimensions: 12 mm (OD) X 120 mm
nominal insertion
(0.47” X 4.72”)
Connection: BNC
2
III. III.
Theory of OperationTheory of Operation
III.
Theory of Operation
III. III.
Theory of OperationTheory of Operation
::
:
::
The HI 4007 or HI 4107 chloride electrodes are potentiometric devices used for the rapid determination of free chloride ions in ground water, boiler water and drinking water.
The electrode functions as a sensor or ionic conductor. The
HI 4007 requires a separate reference electrode to complete
its electrolytic circuit. The HI 4107 has a reference electrode
incorporated in its design. The silver chloride 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 chloride ions in solution and the electrode
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 (-1)
A i=ion activity in sample
T= absolute temperature in K
F= Faraday constant (9.648 x 10
3
4
C/equivalent)
IV. IV.
Design elements of the HI 4007 and HI 4107Design elements of the HI 4007 and HI 4107
IV.
Design elements of the HI 4007 and HI 4107
IV. IV.
Design elements of the HI 4007 and HI 4107Design elements of the HI 4007 and HI 4107
electrodeselectrodes
electrodes
electrodeselectrodes
Cap
HI 4007
RIDE
CHLO
Sensor
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
4
V. Equipment required:V. Equipment required:
V. Equipment required:
V. Equipment required:V. Equipment required:
• Hanna HI 5315 Double Junction Reference Electrode
with HI 7072 Fill Solution for HI 4007.
• 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
Teflon 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 Chloride Measurementsfor Chloride Measurements
for Chloride Measurements
for Chloride Measurementsfor Chloride Measurements
Select appropriate Hanna Instruments standard and ISA
from the list below:
0.1 M Sodium Chloride Standard, 500mL HI 4007-01
100 ppm Chloride standard, 500 mL HI 4007-02
1000 ppm Chloride standard, 500 mL HI 4007-03
ISA, 500 mL HI 4000-00
Using volumetric pipettes and glassware make dilutions to
bracket the concentration of the samples. Standards with
concentrations < 10
-3
M (35.5 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.
A user prepared acetate pH buffer may also be used to
adjust samples to approximately 4 pH. Add 10 mL per 100
mL sample or standard. Prepare 250 mL by dissolving
19.5 g ammonium acetate and 15.0 mL glacial acetic
acid in 200 mL deionized water and diluting to volume.
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