Nitrate, Ammonium and Chloride Sensors for Freshwater Measurements

EXO Nitrate, Ammonium and Chloride SensorsYSI has released nitrate, ammonium and chloride sensors for the EXO advanced water monitoring platform. The guarded sensors are well-suited for freshwater applications down to 17 meters. Possible uses include spot checks and sampling in streams, rivers, lakes, ponds and ground water. The sensors can also be used in short-term continuous monitoring applications.

Nitrate forms in water as a byproduct of bacterial processes, when bacteria use dissolved oxygen to oxidize ammonium. Nitrate may seep into streams, lakes and estuaries from ground water enriched by animal or human wastes or commercial fertilizers. High concentrations of nitrate can amplify the growth of algae and aquatic plants.

Ammonium is a form of nitrogen that aquatic plants can absorb, and high concentrations of ammonium can accelerate the growth of algae. Bacteria can also convert ammonium to nitrate in the process of nitrification, which lowers dissolved oxygen.

Chloride is a component of salt found naturally in minerals and oceans. High concentrations of chloride in freshwater bodies can negatively impact fish and aquatic communities. Uses of the chloride sensor include road salt and de-icing runoff monitoring.

Bonus: Replaceable reagent modules for the nitrate, ammonium and chloride sensors allow you to reduce the costs associated with these sensors by replacing only the relatively inexpensive reagent tip periodically and not the more costly electronics base.

Part numbers for EXO sensors: Nitrate #599709, Ammonium #599710, Chloride #599711.

8 Responses to “Nitrate, Ammonium and Chloride Sensors for Freshwater Measurements

  • I would like to know if this sensor is able to use in salt water. Thank you

    • Hi Sarunyu,

      Thanks for your question.

      At this time, all of our EXO ISE sensors are for freshwater use only.

      ISE sensors are inherently sensitivity to interference commonly found in salt water, especially Ammonium.

      • Hi Patrick,
        Is there an option compatible with a central wiper?

        • Hi Joe,

          In response to your question about EXO and our ISE’s, “Is there an option compatible with a central wiper?”

          The short answer to your question is – No, the EXO’s ISEs are not compatible with the central wiper. They are intended for spot sampling applications, and the built-in probe guard will interfere with the central wiper.

          The longer and more nuanced answer is – some customers choose to use it with the wiper anyway, and it is possible.
          However, when you do this, you run a few risks:

          • The wiper brush can be damaged by the ISE guard and need replacement much sooner and the ISE probe module will also need to be replaced more frequently

          • The ISE probes will require calibration much more frequently than other types of probes (calibration every 3 days in this application)

          • Typically you will only be able to capture ‘qualitative’ trends and not hard numbers because of the calibration requirement

          I hope this response helps!

    • can we use in swimming pool to detect cl level in pool?

      • Hi Krishna,

        In response to your question, “Can we use an EXO in a swimming pool application to detect Cl levels?”

        Yes, you can use the Chloride sensor for this purpose. However, if you are only looking for just this one parameter, we would suggest you use a colorimeter or photometer – as they will be the more cost effective solution.

        Hope this helps!

  • Thanks for sharing this nice article.I read it completely and get some interesting knowledge from this.I again thankful to you for sharing such a nice blog.

  • Thanks for sharing this nice article. I read it completely and get some interesting knowledge from this.
    I again thankful to you for sharing such a nice blog. I like this blog!

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