Nitrite nitrogen is the product of the further oxidation of nitrogen-containing organic matter in water and the process of becoming nitrate. The presence of nitrite in water indicates that the decomposition process of organic matter is still continuing. If the content of nitrite is high, the inorganic process of organic matter in water is very strong, which indicates that pollution still exists.
What are the Hazards of Nitrite Nitrogen in Water?
The toxic effects of nitrite nitrogen on fish are also different in different fish, different developmental stages and different experimental conditions. In addition, crustaceans are more sensitive to nitrite toxicity than fish, that is, when the concentration of nitrite nitrogen in the water is just beyond the normal range, crustaceans can feel it and produce corresponding toxic effects.
Toxigenic Mechanism
The lethal concentration of nitrite on fish and the mechanism of toxicity have been studied in a variety of fish at home and abroad. The toxic effect of acid on fish is mainly that the hemoglobin in the blood is oxidized to methemoglobin (Fe3+) from Fe2+, thus inhibiting the oxygen-carrying capacity of the blood, and in severe cases, it will lead to anoxia and asphyxiation of fish.
Given that nitrite is an intermediate product and has instability in the environment, it is difficult to study the toxicity of nitrite to aquatic animals, and there may be some errors in the study under laboratory simulation conditions. Therefore, no matter the study on nitrite toxicity or toxicity mechanism, It is necessary to comprehensively consider the experimental conditions, experimental equipment, and the selection of subject organisms in order to lay a foundation for future research.
NO2N-8000 nitrite nitrogen online analyzer produced by Hangzhou Modi-Tech is a new generation of automatic maintenance-free online analyzer developed based on China’s standard method. The nitrite nitrogen in the water sample reacts with 4-aminobenzenesulfonic acid amine to produce diazo salt under certain acidic conditions, and the diazo salt is coupled with the characteristic chromogenic agent to produce a red solution. The depth of the color of the solution is proportional to the content of nitrite nitrogen in the sample. The instrument can directly determine the content of nitrite nitrogen in the water sample through photoelectric colorimetry.
