Distillation-microcoulometric titration method and instrument for determining ammonia nitrogen in water

The microcoulometric titration method using a small distillation apparatus and photoelectric indicator signals for the determination of ammonia nitrogen in water solves the problems of low sensitivity and high energy consumption of existing methods, achieving efficient and low-energy ammonia nitrogen detection. It is suitable for the analysis of low ammonia nitrogen samples from domestic sewage, surface water, and drinking water.

CN120820672APending Publication Date: 2025-10-21李武祥龙
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Patent Information

Application Number
CN202410443611.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-04-13
Publication Date
2025-10-21

AI Technical Summary

Technical Problem

Existing methods for determining ammonia nitrogen in water, such as distillation-neutralization titration, have low sensitivity, require large sample sizes, consume a lot of energy, and require frequent calibration, which cannot meet the needs of efficient monitoring of ammonia nitrogen content in water.

Method used

A microcoulometric titration method combining a small distillation apparatus with photoelectric indicator signals is adopted. Ammonia gas is generated by electrolysis and reacted with H+, and the ammonia content is determined by photoelectric signal. This method avoids frequent standardization of titration solutions, improves sensitivity and miniaturizes the apparatus.

Benefits of technology

It achieves highly sensitive ammonia nitrogen determination, reduces sampling volume and energy consumption, is suitable for the detection of ammonia nitrogen in domestic sewage, and can be extended to the determination of low ammonia nitrogen samples in surface water and drinking water.

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Abstract

The invention discloses a novel method and an instrument for measuring ammonia nitrogen in water. The method comprises the following steps: injecting 5ml of a to-be-measured sample or blank secondary water and a small amount of sodium hydroxide solution into a small distillation flask, distilling off water and generated ammonia gas, cooling, feeding into a 5ml volumetric flask filled with 1ml of electrolyte, taking down the volumetric flask when the solution just reaches a 5ml scale line, uniformly shaking, accurately measuring a certain amount of solution each time, the sample is injected into a micro-coulometric titration cell with a photoelectric indication signal in normal operation, the ammonia nitrogen content in the sample is automatically measured, and after a blank value is deducted, the instrument automatically displays the ammonia nitrogen content in the sample. Compared with a classical distillation-neutralization titration method, the method disclosed by the invention has the advantages of simple distillation device, less required sample amount, low energy consumption and no need of calibration solution. The method is especially suitable for measuring ammonia nitrogen in domestic sewage and industrial wastewater treatment plants.
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