Ammonia (NH3) and Ammonium (NH4+) represent two distinct chemical forms of the same basic Nitrogen compound found in freshwater ecosystems. Often referred to collectively as Total Ammonia Nitrogen (TAN), they exist in a dynamic equilibrium that is heavily dependent on the water’s temperature and pH. While Ammonium (NH4+) is a relatively harmless, ionised nutrient readily absorbed by aquatic plants, un-ionised Ammonia (NH3) is an extremely volatile gas that is highly toxic to fish and aquatic invertebrates, even at microscopic concentrations.
The balance and concentration of Ammonia in rivers and inland water courses fluctuate constantly based on biological decay and direct chemical pollution:
Ammonia is a highly critical environmental indicator because it represents “fresh” pollution. High levels of un-ionised Ammonia damage fish gills, cause respiratory distress, destroy cellular membranes, and induce neurological toxicity.
Monitoring is essential because the chemical dynamic can shift violently along two very different timelines:
Because Ammonia is a highly volatile and immediate threat, tracking its concentration allows environmental teams to execute precise, rapid-response mitigation. Continuous real-time monitoring provides the clear spatial and temporal data required to trace a toxic plume directly back to a specific malfunctioning outfall, agricultural zone, or industrial facility.
With accurate data baselines, catchment managers can deploy effective solutions: triggering automated emergency shut-off valves at industrial outfalls, optimising aeration and treatment protocols at municipal sewage plants, enforcing stricter agricultural waste-containment regulations, or implementing riparian wetlands to naturally filter and oxidise Ammonium before it reaches the main river channel.
To capture volatile, rapid chemical spikes and long-term biological nutrient shifts, water resource managers rely on continuous in-situ instrumentation. Aquaread’s Ammonium Ion Selective Electrodes (ISEs) measure the dissolved Ammonium (NH4+) ion directly in the field. When paired with the Aquaprobe’s integrated pH and temperature sensors, the system automatically calculates the exact concentration of highly toxic un-ionised ammonia (NH3) in real time.
Aquaread’s modular, tool-free Ammonium ISE sensors integrate seamlessly into their multi-parameter Aquaprobe range, transforming standard environmental surveys into advanced toxicological monitoring:
AP-2000 Ammonium Electrode with 2 Auto-Range scales 0-99.9 mg/L (ppm) or 100-8,999 mg/L (ppm). Accuracy ±10% of readings or 2ppm (whichever is greater). Probe will also monitor Ammonia when used in combination with pH and temperature readings on the AP-2000 Aquaprobe sensor
AP-5000 Ammonium Electrode with 2 Auto-Range scales 0-99.9 mg/L (ppm) or 100-8,999 mg/L (ppm). Accuracy ±10% of readings or 2ppm (whichever is greater). Probe will also monitor Ammonia when used in combination with pH and temperature readings on the AP-5000 Aquaprobe sensor
AP-7000 Ammonium Electrode with 2 Auto-Range scales 0-99.9 mg/L (ppm) or 100-8,999 mg/L (ppm). Accuracy ±10% of readings or 2ppm (whichever is greater). Probe will also monitor Ammonia when used in combination with pH and temperature readings on the AP-7000, or AP-6000, Aquaprobe sensor
Nutrient overloading and sewage leaks are complex environmental problems that rarely involve a single compound. Aquaread’s multi-port auxiliary configuration allows you to deploy several Ion Selective Electrodes concurrently to get a comprehensive chemical diagnostic map of the river system.
By tracking Nitrate (NO3) alongside Ammonium, you can instantly determine the age and origin of Nitrogen pollution, revealing whether it stems from fresh sewage/fertiliser (high Ammonium) or older, oxidised agricultural runoff (high Nitrate). Concurrently adding a Chloride (Cl-) sensor allows you to trace urban wastewater plumes or industrial salinity signatures, while integrating Calcium (Ca2+) and Fluoride (F-) sensors lets you isolate agricultural influences from geological and industrial inputs. This multi-electrode approach turns a single Aquaprobe into an all-in-one catchment diagnostic toolkit.
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