YSI Ammonia and Ammonium

Ammonium (NH₄⁺) — or its uncharged form ammonia (NH₃) — is a form of nitrogen which aquatic plants can absorb and incorporate into proteins, amino acids, and other molecules. High concentrations of ammonium can enhance the growth of algae and aquatic plants. Bacteria can also convert high ammonium to nitrate (NO₃^-) in the process of nitrification, which lowers dissolved oxygen.

A van der Waals' surface coloured according to charge, superimposed on a ball-and-stick model of the ammonia molecule, NH<sub>3</sub>. Public domain.

YSI 6883 Ammonia - Ammonium ISE Sensor for 6-Series Sondes

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The YSI ammonium sensor consists of a silver/silver chloride wire electrode in a custom filling solution. The internal solution is separated from the sample medium by a nonactin membrane, which selectively interacts with ammonium ions.

Ammonia in water is either un-ionized ammonia or the ammonium ion. Typically, the value reported is the sum of both forms and is reported as total ammonia or simply - ammonia. The relative proportion of the two forms present in water is highly affected by pH.

Un-ionized ammonia is the toxic form and predominates when pH is high. Ammonium ion is relatively non-toxic and predominates when pH is low. In general, less than 10% of ammonia is in the toxic form when pH is less than 8.0 pH units. This proportion increases dramatically as pH increases.

The equilibrium between NH₃andNH₄⁺ is also affected by temperature. At any pH, more toxic ammonia is present in warmer water than in cooler water.

		6600V2 Make the most of your environmental monitoring. The 6600 V2 sonde is the most comprehensive water quality monitoring equipment available with simultaneous measurement of conductivity (salinity), temperature, depth or level, pH/ORP.

		6920 V2 Compact Sonde for Unattended Monitoring The YSI 6920 V2 sonde is an economical logging system, ideal for long-term in situ monitoring and profiling. Two versions: 6920 V2-1 has one optical port, conductivity/temperature port, Rapid Pulse Dissolved Oxygen port, pH/ORP port, and 3 ISE ports 6920 V2-2 has 2 optical ports, conductivity/temperature port, pH port, and one ISE port.

		6820 V2 Compact Sonde for Field Sampling The YSI 6820 V2 is a cost-effective sonde for profiling and spot-checking in rivers, lakes, wetlands, wells, estuaries, and coastal waters. Two versions are available: 6820 V2-1 has one optical port, conductivity/temperature port, Rapid Pulse DO port, pH/ORP port, and 3 ISE ports 6820 V2-2 has 2 optical ports, conductivity/temperature port, pH port, and one ISE port.

		Professional Plus Handheld Multiparameter Instrument The YSI Professional Plus handheld multiparameter meter provides extreme flexibility for the measurement of a variety of combinations for dissolved oxygen, conductivity, specific conductance, salinity, resistivity, total dissolved solids (TDS), pH, ORP, pH/ORP combination, ammonium (ammonia), nitrate, chloride and temperature. Also a very powerful lab instrument for BODs, pH and ORP.

		6882, 6883, 6884 Nutrient Ion-Selective-Electrode Sensors (6-Series) Measure Nutrient Data with Nitrate, Ammonium, and Chloride with Ion Selective Electrodes

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6600V2

6920 V2

6820 V2

Professional Plus

6882, 6883, 6884 Nutrient Ion-Selective-Electrode Sensors (6-Series)