56
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Ion-selective electrodes, ISE’s
With glass membrane
Built similarly to a pH electrode, but using glass which is
sensitive to a certain ion.
In practice, only electrodes for sodium ions are
manufactured.
It is an indicator electrode which must always be used
with a reference electrode. See page 43.
With solid-state membrane
The sensitive membrane is a mixture of salts or a crystal
in the case of the F- ISE.
The membrane and the internal electrolyte can be
replaced.
They are indicator electrodes, and should always be
used with a reference electrode. See page 43.
96 50, Sodium Na+.
Measuring range: 0.02 ppm... 20 g/l
Linear measuring range: From 1 ppm
Working conditions: pH 8 ... 11, 0 ... 80°C
Interferences: Ag+, NH4+, K+, Li+, H+
Electrolyte for the reference electrode: NH4Cl 0.1M
Applications: Foodstuffs, biological solutions, the
environment, water, etc.
96 51, Bromide Br-.
Measuring range: 0.4 ppm ... 80 g/l
Linear measuring range: From 5 ppm
Working conditions: pH 2 ... 12, 0 ... 80°C
Interferences: S2-, CN-, OH-, I-, Cl-, S2O32-.
Electrolyte for the reference electrode: KNO3 1M
Applications: photographic emulsions
96 52, Chloride Cl-.
Measuring range: 0.4 ppm ... 35 g/l
Linear measuring range: From 5 ppm
Working conditions: pH 2 ... 11, 0 ... 80°C
Interferences: S2-, Br-, I-, CN-.
Electrolyte for the reference electrode: KNO3 1M
Applications: foodstuffs, waters, etc.
96 53, Cyanide CN-.
Measuring range: 0.03 ppm ... 2.6 g/l
Linear measuring range: From 0.5 ppm
Working conditions: pH 11 ... 13, 0 ... 50ºC
Interferences: Cl-,I-, Br-, S2O32-, CO32-, CrO42-.
Electrolyte for the reference electrode: KNO3 1M
Applications: waters, galvanizing baths.
96 54, Ag Sulphide//Ag2S.
Measuring range:
0.01 ppm ... 108 g/l as silver, 0.3...32 g/l as sulphide
Linear measuring range: From 0.1 ppm Ag+, 0.5 ppm S2Working conditions: Ag+, pH 1...9, S2-, pH 2...14, 0...50ºC.
Interferences: There should be no Hg2+ and proteins.
Electrolyte for the reference electrode: KNO3 1M
Applications: waters
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96 55, Fluoride F-.
Measuring range: 0.02 ppm ... 20 g/l
Linear measuring range: From 0.1 ppm
Working conditions: pH 5 ... 8, 0 ... 80ºC
Interferences: OH-, high concentrations of Lanthanum complexers
Electrolyte for the reference electrode: KCl 3M
Applications: potable waters, toothpastes, milk, etc.
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96 56, Iodide I-.
Measuring range: 0.01 ppm ... 127 g/l
Linear measuring range: From 0.5 ppm
Working conditions: pH 0 ... 12, 0 ... 50ºC
Interferences: There should be no Hg2+, Cl-, Br-, S2-,
S2O32-, CN-, CO32-, CrO42-.
Electrolyte for the reference electrode: KNO3 1M
Applications: Plants, milk, waters.
Laboratory Catalogue 2004
1st Edition
Ion-selective electrodes, ISE’s
96 60, Calcium Ca2+.
Measuring range: 0.04 ppm ... 40 g/l
Linear measuring range: From 10 ppm
Working conditions: pH 3 ... 12, 0 ... 50°C
Interferences: Cation detergents, Sr2+, Ba2+, Zn2+, Mg2+,
Li+, Cs+, Na+, K+, Rb+ and NH4+.
Electrolyte for the reference electrode: KCl 3M
Applications: milks, serums, soils, waters.
96 61, Potassium K+.
Measuring range: 0.04 ppm ... 39 g/l
Linear measuring range: From 5 ppm
Working conditions: pH 2 ... 12, 0 ... 50°C
Interferences: Cation detergents, Rb+, Na+, H+, NH4+, Cs+,
Mg2+, Ca2+, Ba2+, Sr2+.
Electrolyte for the reference electrode: Al2(SO4)3 0.9M
Applications: potable waters, toothpaste, milk, etc.
96 62, Nitrate NO3-.
Measuring range: 0.6 ppm ... 60 g/l
Linear measuring range: From 10 ppm
Working conditions: pH 3 ... 12, 0 ... 50°C
Interferences: Anion detergents, I-, Br-, F-, Cl-, SCN-,
MnO4-, HCO3-, NO2-, ClO4-, SO42-.
Electrolyte for the reference electrode: : Al2(SO4)3 0.9M
Applications: fertilizers, waters, meats, vegetables.
96 63, Ammonium NH4+.
Measuring range: 0.02 ... 18 g/l
Linear measuring range: From 5 ppm
Working conditions: pH 4 ... 7, 0 ... 50°C
Interferences: Cation detergents, K+, Na+, Li+, H+, Rb+,
Cs+, Mg2+, Ca2+, Ba2+, Sr2+.
Electrolyte for the reference electrode: Al2(SO4)3 0.9M
Applications: foodstuffs, fertilizers, boiler waters.
Description
Electrodes
Specify code and name of the ion to be measured
IMPORTANT: Solid-state and polymer-membrane selective electrodes are
supplied with an electrolyte solution.
Spare membranes
96 70
Bromide (Br-), 1 membrane
96 71
Chloride (Cl-), 1 membrane
96 72
Cyanide (CN-). 1 membrane
96 73
Ag Sulphide (Ag2S), 1 membrane
96 74
Fluoride (F-), 1 membrane
96 75
Iodide (I-), 1 membrane
96 76
Copper (Cu2+), 1 membrane
96 80
Calcium (Ca2+), 1 membrane
96 81
Potassium (K+), 1 membrane
96 82
Nitrate (NO3-), 1 membrane
96 83
Ammonium (NH4+), 1 membrane
Spare electrolytic solutions
96 87
Bromide (Br-), 10 ml flask, 2 units
96 88
Chloride (Cl-), 10 ml flask, 2 units
96 89
Cyanide (CN-), 10 ml flask, 2 units
96 90
Ag Sulphide (Ag2S), 10 ml flask, 2 units
96 91
Fluoride (F-), 10 ml flask, 2 units
96 92
Iodide (I-), 10 ml flask, 2 units
96 93
Copper (Cu2+), 10 ml flask, 2 units
96 94
Calcium (Ca2+), 10 ml flask, 2 units
96 95
Potassium (K+), 10 ml flask, 2 units
96 96
Nitrate (NO3-), 10 ml flask, 2 units
96 97
Ammonium (NH4+), 10 ml flask, 2 units
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With polymer membrane
The polymer membrane is made up of several ion-selective
substances, depending on the ion to be measured.
The membrane and the internal electrolyte can be replaced.
Used together with a reference electrode.
Ordering information
Code
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96 57, Copper Cu2+-.
Measuring range: 0.1 ppm ... 6 g/l
Linear measuring range: From 1 ppm
Working conditions: pH 1 ... 6.5, 0 ... 50°C
Interferences: Pb2+ and Cd2+.
Electrolyte for the reference electrode: KNO3 1M
Applications: galvanising baths.
57
Ionic Strength Adjusters (ISA’s)
Aluminium Sulphate Al2(SO4)3 0.9M.
This is the ionic strength adjuster and the reference
electrolyte for potassium-, nitrate- and ammoniumselective electrodes
TISAB III
This is the ionic strength adjuster for the fluoride
selective electrode.
Laboratory Catalogue 2004
1st Edition
Ionic strength adjusters, ISA
99 00
TISAB III, for F- electrode, 250 ml flask
99 02
Aluminium sulphate, for K+,NO3-,NH4+, 250 ml flask
58
Ion-selective electrodes, ISE’s
(continued)
No reference electrode is required.
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Etc, …
DIN
96 65, Ammonia NH3
Measuring range: 0.1 ppm... 17 g/l
Linear measuring range: From 1 ppm
Working conditions: pH 4...13, 0... 50ºC
Interferences: volatile amines. At pH < 11, CO2, SO2,
Cl2, H2S.
Applications: waste waters, Kjeldahl.
96 66, Carbon dioxide CO2
Measuring range: 2.6 ppm ... 0.9 g/l
Linear measuring range: From 5 ppm
Working conditions: pH 1...5, 0 ... 50ºC
Interferences: volatile acids
Applications: mineral waters, wines, bacteriological
cultures.
Spare parts
USA
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Note: These electrodes are
manufactured with fixed
cable and BNC connector.
They can also be supplied,
under demand, with
another connector.
See page 60.
Price does not vary.
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With membrane for gases
These are combined electrodes integrating a pH
electrode. This pH electrode is immersed in an electrolyte
and separated from the solution to be measured by a
gas-permeable membrane.
The membrane and the internal electrolyte can be
replaced. That is why they are supplied in boxes of 20
membranes and a flask of 50 ml of electrolyte.
The membrane for these electrodes is PTFE and is
common for both NH3 and CO2.
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Ordering information
Code
Description
Electrodes
96 65
Combined electrode (NH3), BNC connector
96 66
Combined electrode (CO2), BNC connector
IMPORTANT: Selective electrodes with membranes for gas are supplied
with 20 membranes and 1 electrolyte solution.
Spare membranes (common for both electrodes)
96 85
Set of 20 membranes for NH3 or CO2 electrodes
Spare electrolytic solutions
96 65 NH3
96 66 CO2
96 98
Ammonia (NH3), 50 ml flask
96 99
Carbon dioxide (CO2), 50 ml flask
Laboratory Catalogue 2004
1st Edition