Hanna Instruments-4101 Ammonia Combination ISE Electrode
The Hanna Instruments-4101 is an Ammonia combination Ion Selective Electrode ideal for the detection of ammonium and checking for Ammonia in wine, beer, water, waste water and soil/agriculture.
The Hanna Instruments-4101 is a gas sensing, combination ion selective electrode (ISE) for the determination of ammonia (NH3) in solution. Its PTFE membrane allows for ammonia gas diffusion into a thin layer of internal electrolyte. The internal sensing elements are within a durable Delrin® body.
- Replaceable PTFE membranes
- Durable Delrin® body
- Detection from 0.02 to 17,000 mg/L NH3
The Hanna Instruments-4101 ammonia ion selective electrode is a complete potentiometric cell that contains both a silver/silver chloride (Ag/AgCl) reference and a pH measurement element. These elements are housed within a plastic body with a chloride ion-containing electrolyte, and are isolated from the sample by a gas permeable membrane made of polytetrafluoroethylene (PTFE).
Ammonia can exist in two different forms: ammonia as a gas (NH3) and ammonium as the ionised form (NH4+). The concentration of each form in a solution is dependent on the solution’s pH. The pKa is the pH value at which ammonia and ammonium are in equilibrium. The pKa of the ammonia/ammonium relationship is 9.24; thus, at a pH of 9.24 there will be an equal concentration of ammonia and ammonium. As pH decreases, becoming more acidic, the concentration of ammonium increases and ammonia decreases. The opposite occurs as the pH increases. The actual concentration for either species can be determined by knowing the concentration of ammonia and the pH of the sample.
For the Hanna Instruments-4101 to measure ammonia accurately, it is important that the pH of the calibration standards and sample be raised with the ammonia ionic strength adjuster (ISA) solution. The ammonia ISA raises the pH of the solution to pH 11. Any ammonium present in the calibration standards and sample will be converted to ammonia, ensuring an accurate measurement. The Hanna Instruments-4101 ammonia gas sensing ISE can measure from 1µM (0.02 mg/L) to 1M (17,000 mg/L).
Frequently Asked Questions
Clear answers to help you choose the right water testing solution with confidence
Which brands of water testing kits do you supply?
Do you provide kits for both home and professional use?
Yes — whether you’re a pool or spa owner, aquarium keeper, utility company, or a university laboratory, we have the right solution for your needs.
Can I arrange servicing or calibration for my photometer?
Absolutely. We also provide servicing and calibration to keep your photometers accurate and reliable.
How quickly do you dispatch orders?
Orders placed before 2:30 pm (Monday–Friday) are dispatched the same day. We also ship on Saturdays for your convenience.
Which couriers do you use for delivery?
We deliver through UPS, DPD, and Royal Mail. You can also choose to upgrade to next-day delivery at checkout.
What is your return policy?
We accept returns within 14 days of delivery provided the items are unused, in their original packaging, and in resalable condition. Please contact our team before returning any items.
Can I place bulk or business orders?
Yes, we welcome bulk, trade, and institutional orders. For tailored pricing or large quantities, please get in touch with us directly.
How can I get help if I’m unsure which kit to buy?
You can call us at 📞 +44 (0)115888 2726 and our team will guide you in choosing the most suitable kit for your needs.