Ammonia

What is it? Ammonia is a nitrogen-based compound that exists in water as either un-ionized ammonia (NH₃) or the ammonium ion (NH₄⁺), depending on pH and temperature.

Why is it important? Ammonia is a key nutrient in aquatic systems but can be toxic to aquatic life at elevated levels. It is a byproduct of the breakdown of organic matter and waste, and is commonly found in sewage, agricultural runoff, and industrial discharges. Because of its potential to harm fish and invertebrates, ammonia is closely monitored in many freshwater and marine environments.

What does it mean? While nitrogen is essential for life, excess ammonia in water can signal pollution and lead to water quality concerns. High concentrations can be harmful to fish and other aquatic organisms, particularly in warm, high-pH conditions where the more toxic un-ionized form is dominant. Monitoring ammonia levels helps identify sources of contamination and manage impacts on aquatic ecosystems.