Tropic Marin Nitrite/Nitrate Test for Seawater/Freshwater

Nitrite measuring range: 0 - 2.0 mg/l

Nitrate measuring range: 0.5 - 50.0 mg/l

Nitrite solution: 0.02 mg/l

Nitrate solution: 0.5 mg/l


Nitrite ions (NO2–) and nitrate ions (NO3–) are produced from ammonium (NH4+) during the nitrification process. In the first stage of this bacterial process, nitrite is produced, which is highly toxic to freshwater animals. If nitrification is functioning properly, the nitrite is converted to nitrate in the second stage. In marine aquariums, elevated nitrate concentrations disrupt the growth of sensitive corals. A danger of high nitrate levels in all aquariums is the strong promotion of algae growth. In rare cases, nitrate deficiency can also occur. Therefore, the nitrite and nitrate concentrations in aquarium water should be checked regularly.

Nitrite levels in all aquariums should generally be kept below 0.2 mg/l. For nitrate in freshwater aquariums, levels below 50 mg/l are recommended, while in saltwater aquariums, concentrations should not exceed 20 mg/l. When keeping stony corals, nitrate levels below 10 mg/l are desirable. Lower limits for nitrate depend on the overall conditions in the aquarium.


20 ml of reagent A
20 ml of reagent B
10 ml of reagent C
1 glass cuvette 10 ml
1 dosing syringe 5 ml
1 color chart
1. Instructions for use

Safety instructions:

Danger Danger

H315 H319 H226 H225

P102 P305+P351+P338 P210