Ammonia / 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.
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 NH3 and NH4+ is also affected by temperature. At any pH, more toxic ammonia is present in warmer water than in cooler water.

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ysi-prodss

YSI ProDSS - Digital Sampling System

The YSI ProDSS - Digital Sampling System - is the ultimate water quality field instrument for sampling and profiling. With the ProDSS, we have answered our customer's demands to produce a truly rugged, reliable and smart multiparameter handheld instrument.

wtw-lab-photoflex

WTW Portable colorimeter pHotoFlex® STD

The portable pHotoFlex® STD with energy-efficient LED optics is equipped with 6 wavelengths and a foldable adapter for various applications with 16 mm and 28 mm cuvettes, for even the smallest concentrations.

YSI EXO2 multiparamter water quality instrument

YSI EXO2 Multiparameter Sonde

The EXO advanced water quality monitoring platform includes the versatile multiparameter EXO2 sonde for oceanographic, estuarine, or surface water applications. Collect data to 250m with the advanced EXO2 sonde – contains six replaceable 'smart' sensors and a central wiper to clean biofouling.

exo1

YSI EXO1 Multiparameter Sonde

Capturing accurate data in fresh water, ground water and marine aquatic environments is easy with . The versatile multiparameter EXO1 sonde is ideal for estuarine, surface water, or ground water applications.

Instrument Only. Cables, probes/sensors, and accessories sold separately - please see the "Accessories" tab for details.

600OMS

YSI 600OMS V2 Sonde

Measure optical dissolved oxygen, chlorophyll, blue-green algae, rhodamine, or turbidity in combination with temperature, conductivity and depth. Designed for use in fresh, sea or polluted waters, the 600OMS V2 data sonde utilizes the field-proven YSI sensors and incorporates innovations in water quality sensor modules that fits into the sonde body.

EXO 3 multiparameter sonde

YSI EXO3 Multiparameter Sonde

Offering the greatest value of any sonde available in the market, EXO3 combines the maneuverability of EXO1 with the powerful antifouling wiper of the EXO2. EXO3 is a purpose-built sonde for monitoring major water quality parameters, including: pH, conductivity, temperature, turbidity and dissolved oxygen.

Alt: WTW photoLab® 7600 UV-VIS

WTW photoLab® 7000 Series Spectrophotometer

The photoLab® 7000 series of spectrophotometers combine latest optical technology with digital processing to provide users with an efficient and effective means of gathering spectrophotometric data in chemical, pharmaceutical, food, beverage and especially environmental applications.   Special software features include up to 200 industry standard scales/methods and the unique OptRF feature for determining nitrate and nitrate without the need for reagents. Additionally, photoLab Data software expands its capability by displaying results in industry standard color scales including CIE, EBC, ASTM, ICUMSA and so on.

WTW inoLab® Multi 9430 IDS

WTW inoLab® Laboratory Multi-parameter Benchtop Meters

Application oriented benchtop sets for multiple parameter monitoring: pH, mV, ISE, saturation, concentration, partial pressure, conductivity, special resistance, salinity, TDS, temperature

Cutting edge technology from WTW for demanding laboratory applications. Two digital inoLab® multi-parameter instruments for IDS sensors for parallel measuring of one identical or varying parameters. Up to three sensors (inoLab® Multi 9430 IDS) can be connected. A large glass shield protects the graphic display and supports the presentation of the measuring values and recognition of important information. The innovative and antibacterial keypad helps to protect against microbiological contamination. The solid zinc die-casting lower case gives the meters a safe standing and also protection from the environment. As a special feature, both models can be upgraded with an additional module for conventional pH measurement.

wtw-lab-photoflex

WTW Portable colorimeter pHotoFlex® STD

The portable pHotoFlex® STD with energy-efficient LED optics is equipped with 6 wavelengths and a foldable adapter for various applications with 16 mm and 28 mm cuvettes, for even the smallest concentrations.

Multiparameter water quality verticle profiler

YSI 6951 Pontoon - Vertical Profiling System

The YSI 6951 Pontoon Vertical Profiling System offers user-programmable sample intervals, redundant error recovery logic that detects unexpected activity and recovers automatically, and is compatible with all YSI EXO and 6-Series sondes equipped with depth.

2020 3G family

WTW IQ SensorNet 2020 3G Controller

With an easily scalable solution, the 2020 3G allows for the connection of up to 20 sensors. This modular plug-and-play system allows you to monitor the water quality in your wastewater system continuously and accurately.

2950D Biochemistry Analyzer

YSI 2950D Biochemistry Analyzer

YSI has earned a reputation as the Gold Standard in bio-analytical instruments with highly accurate sensors and rapid results. The key to generating analyte-specific results in 60 seconds or less is YSI's innovative biosensor technology.

Buoy - Vertical Profiling System

YSI 6952 Buoy - Vertical Profiling System

The YSI 6952 Buoy - Vertical Profiling System offers user-programmable sample intervals, redundant error recovery logic that detects unexpected activity and recovers automatically, and is compatible with all YSI EXO and 6-Series sondes equipped with depth.

YSI HYCAT

Autonomous Surface Vehicle - offering remote water quality, side scan sonar, bathymetry, water velocity and depth measurement