An important indicator of water pollution degree analysis is to determine the ammonium ion content in the aqueous solution. High ammonium ion content means high pollution. The ammonia-sensitive electrode introduced by Metrohm can measure the concentration of ammonium ions in the aqueous solution, and has an ammonia-sensitive electrode replacement component or a replaceable ammonia-sensitive membrane, which makes sample analysis more economical and effectively saves experimental costs.

The principle of ammonia-sensitive electrode measurement: the ammonium ions in the sample are converted into ammonia gas under alkaline conditions after adding NaOH solution. Ammonia gas diffuses through the gas-permeable membrane, and the compound pH glass acid-base electrode detects the concentration of ammonia gas. Depending on the application, Metrohm offers two types of ammonia-sensitive electrodes.

For the determination of low-content ammonium ion concentration in aqueous solution (for example: drinking water, boiler water, etc.), you can choose NH3-ISE (low-content) ammonia-sensitive electrode, which is detachable, independently tested, and attached with a certificate Replacement components for ammonia-sensitive electrodes. The gas-sensitive membrane of this electrode is more sensitive, has a fast response time and low detection limit.

Highly polluted water samples (for example: wastewater, water samples containing residual oil) often contain relatively high levels of ammonium ion concentration. For such samples, Metrohm offers NH3-ISE (high content) ammonia-sensitive electrodes. This type of electrode only requires regular replacement of the ammonia gas sensor membrane, without the need to replace the entire set of ammonia sensor replacement components. The ammonia-sensitive membrane used in the electrode is characterized by short regeneration time and stable response signal for the measurement of high-content ammonium ion concentration solutions.

About Metrohm:

         In 1950, Metrohm invented a composite pH electrode.

         In 1954, Metrohm designed a practical automatic polarograph for trace analysis.

         In 1956, Metrohm developed the piston-type burette.

         In 1968, the world's digital titrator, digital electronic burette, was born in Metrohm.

         ...

         In 2007, Metrohm developed an intelligent ion chromatograph.

         In 2010, Metrohm developed the World Ultraviolet Ion Chromatography.

         Metrohm-Metrohm, is an international analytical instrument company covering all kinds of different ion analysis technologies in the world today.