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Ammonium Ion-Selective Electrode

The Ammonium Ion-Selective Electrode (ISE) can be used to measure the concentration of Ammonium (NH4+) in aqueous samples.

SKU: NH4-BTA Categories: ,


Use the Ammonium ISE to measure levels of ammonium ions introduced from fertilizers. It can also indicate aqueous ammonia levels if sample solutions are acidified to convert NH3 to NH4+.

The Ammonium ISE has a combination-style, non-refillable, gel-filled electrode. Like all other PVC ISE membranes, the membrane on the ISE has a limited life expectancy. However, the replaceable module of ISE allows you to simply discard the used membrane module, and replace it with a new one.

Note: We recommend that you do not purchase ISE replacement modules too far in advance of their expected time of use as degradation occurs while they are stored on the shelf.

Important: Ion-Selective Electrodes require good chemical technique and careful calibration to obtain accurate results; they are not recommended for middle school or elementary students.

Range (concentration): 1 to 18,000 mg/L (or ppm)
Reproducibility (precision): ±10% of full scale (calibrated 1 to 100 mg/L)
Interfering ions: K+
pH range: 4–7.5 (no pH compensation)
Temperature range: 0–40°C (no temperature compensation)
Electrode slope: +56 ±4 mV/decade at 25°C
Electrode resistance: 1–4 MΩ
Immersion: 2.8 cm
Electrode length: 155 mm
Body diameter: 12 mm
Cap diameter: 16 mm
Cable length: 100 cm

Vernier Ammonium Ion-Selective Electrode
30 mL bottle of Ammonium Low Standard (1 mg/L)
30 mL bottle of Ammonium High Standard (100 mg/L)
Short-term ISE soaking bottle
User manual

Electrode Support (ESUP)

Ammonium Replacement Module (NH4-MOD)
Electrode Storage Bottles (BTL-ES)
Standard NH4 ISE Solution ()

User Manual:
Warranty: 5-year limited warranty (1 year on module, none on consumables)