Nitrate + Nitrite (NO3)

Nitrate (NO3) is a key parameter of interest for both wastewater treatment operations and for environmental monitoring of drinking water sources. In addition, water systems utilizing chloramines to maintain a disinfection residual need to monitor for nitrification in their distribution systems.

While nitrate is important in water and wastewater treatment, the lab methods for analyzing nitrate are notoriously tricky. As a result, nitrate information is usually gathered in periodic grab samples with a low frequency, and the opportunity for active management of nitrate issues is limited. To meet this need, a new generation of optical UV-nitrate sensors is emerging. These instruments detect nitrate by measuring the absorption of UV light by the nitrogen-oxygen bonds of the nitrate and nitrite molecules. They also collect other spectral readings, to provide correction factors for absorption at the nitrate/nitrite UV frequency by dissolved organics or solid particles.

The LiquID Station utilizes UV-nitrate detection capability, but with additional advancements for added reliability and sensitivity. LiquID collects a range of measurements on a cycle, about every two minutes, across the light spectrum, including at the frequency for nitrate and nitrite detection. Compared to other instruments, LiquID operates far deeper in the UV range, utilizing more high energy light frequencies and getting a better resolution of interference. The result is an instrument with high sensitivity as well as reliability of matrix correction, with combined nitrate+nitrite detection sensitivity below 0.05 parts per million.

  • Parameter Detection Range/Sensitivity Accuracy
    Nitrate+Nitrite (NO3) 0.03 to 50 mg-N/L ±9%

  • To learn more about the optical approach used by the LiquID to measure Nitrate+Nitrite please read the How It Works – Nitrate+Nitrite located in the Library and Resources section of our website.
  • Please Contact Us if you have additional questions about measuring Nitrate+Nitrite or general inquires into the LiquID Station.