Measure NOx- or NO2-
The NOx- sensor is an excellent tool for on-line measurement in experiments where resolution of time and concentrations is important. The sensitivity is high and the sensor can measure concentrations below 0,5 µM. The NOx- sensor has a good stability over days and works at full oceanic salinity.
Compared to conventional NO3-/ NO2- analyzing systems (HPLC and ion chromatography) the Unisense NOx- biosensor is a high quality research tool and a low cost alternative. The NOx- biosensor can measure directly in soil slurries, drinking water, wastewater and water from lakes, streams and seas and it can be applied in a wide variety of research applications including:
- Wastewater research
- Environmental sciences
The biosensor consists of an electrochemical N2O transducer, equipped with a biochamber, which is mounted on the transducer by a simple locking ring. There are two versions of the bio chamber, one for nitrate/nitrite (NOx-) measurements and one for nitrite (NO2-) measurements.
The NOx- or NO2- ions enter the sensor by molecular diffusion through the ion-permeable membrane. The active denitrifying bacteria reduce NOx- or NO2- to N2O, which is detected electrochemically by the N2O transducer. The electron donors for this de-nitrification are contained in a nutrient reservoir within the sensor. The bacteria are therefore continually growing, making the biosensor much more robust than enzyme-based biosensors.
The electrochemical component (N2O transducer) and the biological component of the sensor are separated by a silicone membrane, which only allows gases to penetrate. Therefore, the only interfering substance is external N2O, which is normally present in negligible concentrations in natural environments.
This principle allows the sensor to measure NOx- or only NO2- in chemically and biologically complex environments, e.g. seawater, waste water, liquid manure, mud, and soil extractions, without interference from substances other than N2O.
|Standard Glass Sensor||Outside tip diameter|
|NOx biochamber|| Replaceable bioreaction
chamber for nitrate
|NO2- biochamber|| Replaceable bioreaction
chamber for nitrite
Find a complete list of NOx- macrosensor specifications, including warranty and expected life time, below and possible microsensor customizations and adaptations under Related Products found to the right.