Ion Selective Electrode for Ammonium
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NH4+
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Technical Data Sheet
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Structure of the Electrode
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range*:
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- 10-5 to 1 mole amonium
- 0.18 to 18,000 mg/L ammonium
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The ammonium selective electrode is a matrix membrane electrode with a solid
contact or a liquid contact. The flexible ammonia selective membrane is made from
a special organic ion exchanger which is dissolved in an organic solvent and
embedded into a PVC matrix.
As an organic phase the resulting "liquid membrane" is fixed by the PVC matrix and
renders a stable phase boundary.
An inner electrolyte (only for electrodes with a liquid contactor) (0.1 mole/L
moonium chloride NH4Cl or a solid contactor forms the discharge contact
for the equilibrium voltage which develops at the phase boundary.
Both the shaft and the ion selective membrane are made from PVC. This should be
taken into account when using the electrode.
Ordering Information
| PO No. |
Type |
Description |
| 118 100 |
NH4 |
selective electrode with 1m sealed cable |
| 118 101 |
NH4 |
selective electrode with 1m sealed cable with BNC connector |
| 118 102 |
NH4 |
selective electrode with 1m sealed cable with DIN connector |
| 118 005 |
NH4 |
selective electrode with indutrial threaded head |
| 119 004 |
NH4 |
selective threaded mini electrode with BNC connector |
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slope of characteristic:
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response time in 10-2mole,
180 mg/L ammonia solution:
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drift within 30 minutes:
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drift within 24 hours:
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concentration of interfering ion species:
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- K+: 10 times
- Na+: 103 times
- Mg2+: 104 times
- Ca2+: 104 times
- H+: 102 times
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pH range:
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temperature range:
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resistance:
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sensor material:
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- organic ion exchanger in a special solvent, homogeneously distributed
in PVC
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shaft material:
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dimensions:
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- immersion depth 120mm
- diameter 12 mm
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