Ammonium Ion-Selective Electrode
The Ammonium Ion-Selective Electrode (ISE) can be used to measure the concentration of Ammonium (NH4+) in aqueous samples.
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
Electrode Support (ESUP)
Ammonium Replacement Module (NH4-MOD)
Electrode Storage Bottles (BTL-ES)
Standard NH4 ISE Solution ()