Ammonia nitrogen detection method and device based on electrodialysis ion transformation

Abstract

The invention relates to an ammonia nitrogen detection method and an ammonia nitrogen detection device based on electrodialysis ion transformation. Through a polarization principle of electrodialysis, pure water is electrolyzed to generate alkaline electrolytic water so as to replace the effect of a sodium hydroxide solution, thus achieving transformation of ammonium ions in a sample solution. The ammonia nitrogen detection device comprises an anode compartment electrodialysis cell, a cathode compartment electrodialysis cell, an electromagnetic valve, an injection pump and a detection tank, wherein two electrode compartments of the anode compartment electrodialysis cell and the cathode compartment electrodialysis cell are separated by a cation exchange membrane; cation exchange resin and an anode electrode are arranged inside the anode compartment; anion exchange resin and a cathode electrode are arranged inside the cathode compartment. The ammonia nitrogen detection method comprises the following steps: electrolyzing by the electrodialysis device by using an electrolytic cell with the two electrode compartments; after electrolysis, transferring a certain volume of alkaline electrolytic water to the detection tank, mixing the electrolytic water with a water sample to be detected according to a proportion, and ensuring that the pH of the mixed water sample is higher than 11 to meet an alkalization need; detecting by using an ammonia-sensitive electrode to obtain the ammonia nitrogen content value of the water sample to be detected. Chemical reagents are not required, and alkaline electrolytic water can be continuously generated only by using electrical energy and pure water, so that environment pollution and secondary pollution are avoided.

Description

technical field [0001] The invention relates to ammonia nitrogen content detection technology, in particular to an ammonia nitrogen detection method and device based on electrodialysis ion transformation. Background technique [0002] Ammonia nitrogen widely exists in surface water and groundwater. Ammonia nitrogen (NH 3 -N) is based on free ammonia (NH 3 ) or ammonium salt (NH 4 + ) form exists in water bodies. Ammonia nitrogen is an important factor for the eutrophication of water bodies. When the content of ammonia nitrogen in the water is high, the water will be black and smelly, which will cause poison to aquatic plants and even lead to the death of fish and shrimp aquatic organisms. Moreover, ammonia nitrogen can be decomposed into nitrite under the action of microorganisms. When the nitrite content in the water exceeds the standard, drinking this water will make the nitrite combine with the protein in the human body to form a strong carcinogen - nitrosamine. Lon...

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Problems solved by technology

This method always needs to consume sodium hydroxide solution during continuous measurement, so the maintenance frequency is high, the cost is high, and it is easy to cause secondary pollution

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