Automatic nitrite analyzer and detection method thereof

Abstract

The present invention discloses a nitrite detection method. The method comprises the following steps that: 1) a nitrite-containing material requiring detection and a reagent are placed in a reaction tank, the nitrite reacts with the reagent to generate nitrogen gas; 2) the pressure of the nitrogen gas is detected; 3) the concentration of the nitrite in the material requiring detection is calculated according to the pressure of the nitrogen gas. According to the present invention, the reagent is adopted to carry out the reaction with the nitrite to generate the N2; after completing the reaction, the pressure value is detected, and the nitrite content is calculated; the reaction of the reagent and the nitrite is performed in a closed reaction tank, and the N2 pressure is detected; according to the gas state equation, the pressure is proportional to the amount of the N2, and the amount of the N2 is proportional to the concentration of the nitrite, such that the nitrite concentration in the water body can be obtained by detecting the N2 pressure. With the present invention, the wide range detection of the nitrite can be achieved, and both the micro detection and the constant detection can be achieved. The present invention further discloses an automatic nitrite analyzer adopting the detection method.

Description

technical field [0001] The invention relates to the technical field of nitrite detection, in particular to an automatic nitrite analyzer and a detection method. Background technique [0002] Nitrite is a toxic substance that widely exists in natural water, soil and food, and is an important intermediate product of the decomposition of organic nitrogen. After the human body ingests nitrite, it can react with secondary amines, tertiary amines and amino compounds to form strong carcinogen nitrosamine compounds, thereby inducing cancer of the digestive system. Excessive nitrite in the body can also oxidize ferrous ions in the blood to ferric ions, transform normal hemoglobin into methemoglobin, lose oxygen-carrying capacity, cause tissue hypoxia, and cause nitrite poisoning. For this reason, all countries in the world have clear regulations on the maximum residual amount of nitrite in food and drinking water. For example, the American Public Health Association stipulates that ...

AI Technical Summary

Problems solved by technology

This method is mature, reproducible, and accurate, but it is time-consuming and easily interfered by other impurities. The reagents used are highly toxic and carcinogenic, and are likely to cause harm to the environment and analysts, forming secondary pollution, and the lowest detection The concentration of nitrite nitrogen is 0.003mg / L, and the detection limit is 0.20mg / L. It is difficult to realize the wide range detection of nitrite.

[0004] How to avoid the disadvantages of narrow detection range of nitrite and difficult to realize constant analysis has become a technical problem to be solved urgently by those skilled in the art

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