Input type ammonia nitrogen water quality sensor

Abstract

The invention discloses an input type ammonia nitrogen water quality sensor and an ammonia nitrogen concentration measurement method. The input type ammonia nitrogen water quality sensor comprises a sensor body and further comprises a pH composite electrode and an ammonia nitrogen composite electrode which are arranged at the bottom of the sensor body, wherein the pH composite electrode is put into to-be-measured liquid and is used for obtaining a pH value of the to-be-measured liquid; the ammonia nitrogen composite electrode comprises an ammonium ion induction electrode and an ammonia nitrogen reference electrode, and an ammonium ion induction membrane is arranged at the head part of the ammonium ion induction electrode; a temperature sensor is arranged at the bottom of the sensor body and is used for measuring the current temperature of the to-be-measured liquid. The input type ammonia nitrogen water quality sensor and the ammonia nitrogen concentration measurement method disclosed by the invention have the beneficial effects that the potential difference between the ammonium ion induction electrode and the ammonia nitrogen reference electrode in the to-be-measured liquid is obtained by the ammonia nitrogen composite electrode; the ammonium ion concentration is calculated and obtained based on an Nernst equation. The input type ammonia nitrogen water quality sensor is also provided with the pH composite electrode and the temperature sensor; after the pH value and the water body temperature are measured, a compensation equation is calculated and obtained by curve fitting,so that the measurement is more stable and accurate.

Description

technical field [0001] The invention belongs to the field of water quality detection, in particular to an input type ammonia nitrogen water quality sensor. Background technique [0002] Water quality detection is an important means to protect the water environment. Water quality detection usually includes hydrogen ion detection and ammonium ion detection. pH sensors and ammonia nitrogen sensors are the most commonly used measuring instruments. Due to the influence of the surrounding environment, the signals returned by the sensors will be doped with some interference. Signal, that is, signal drift, the common drift is temperature drift, that is, the temperature change of the water body causes the change of the output, which makes the measurement of the hydrogen ion concentration and the ammonium ion concentration inaccurate. [0003] Ammonia nitrogen in water is mainly in the form of free ammonia (NH 3 ) and ammonium ions (NH 4 + ) form, there is a chemical equilibrium re...

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Problems solved by technology

[0002] Water quality detection is an important means to protect the water environment. Water quality detection usually includes hydrogen ion detection and ammonium ion detection. pH sensors and ammonia nitrogen sensors are the most commonly used measuring instruments. Due to the influence of the surrounding environment, the signals returned by the sensors will be doped with some interference. Signal, that is, signal drift is generated. The common drift is temperature drift, that is, the temperature change of the water body causes the output to change, which makes the measurement of hydrogen ion concentration and ammonium ion concentration inaccurate.

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