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Hach 27553-25 AquaChek ammonia nitrogen test strips

$54.85

Hach Aquachek ammonia / ammonium nitrogen test strips. Tests for NH3-N (ammonia nitrogen component) between 0 - 6 mg/l. Gradation 0, 0.25, 0.5, 1. 3, 6. This is approx. 0, 0.3, 0.6, 1.2, 3.65 and 7.3 ppm as NH3. Pack of 25. Ammonia can build up in water when there is excessive decomposition of nitrogenous organic matter. In aquaria high ammonia can be harmful to fish. These strips test for combined ammonia and ammonium nitrogen. In acidic (less than pH 7) solutions less harmful ammonium dominates but as pH rises harmful ammonia levels increase.

At 20 deg C here is the proportion (%) that harmful ammonia makes up of the total ammonia and ammonium: pH 7, 0.4%; pH 7.5, 0.99%; pH 8, 3.83%. Source Lamotte Smart Colorimeter Manual. So take a pH reading when measuring ammonia-N then multiply by the percentage given (interpolate if necessary) to get harmful ammonia.

Keep in mind that the proportion of harmful ammonia increases with temperature. For example between 10 deg C and 20 deg C the proportion of harmful ammonia approximately doubles at the same pH.


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  • Shipping Weight: 0.1Kg
  • 10 Units in Stock


This product was added to our catalog on Tuesday 30 November, 1999.

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