A low-concentration ammonia nitrogen detection method and device for concentrated ammonia nitrogen

Abstract

The invention discloses a low concentration ammonia nitrogen detection method and a device of concentrated ammonia nitrogen, and belongs to the field of water quality detecting. The device comprises an intermediate bulkhead and the intermediate bulkhead divides a box body into an upper tier and a lower tier, wherein the upper tier comprises an injection pump, a multi-way solenoid valve, a signal processing and controlling unit and a U-shape tube, a U-shape opening of the U-shape tube faces upwards, a forward permeable membrane is arranged in the middle position of the bottom of the pipeline of the U-shape tube, a spectral confocal displacement sensor is fixedly arranged above a left tube opening of the U-shape tube, a black box is fixed on the intermediate bulkhead and is arranged below the U-shape tube, an LED illuminant and a silicon photocell are arranged the left side wall and the left side wall of the black box in a face-to-face mode; the lower tier is provided with seven reagent bottles including a reagent bottle for water sampling ready to be detected, a reagent bottle for a masking agent, a reagent bottle for a nessler reagent, a reagent bottle for driving liquid, a reagent bottle for cleanser, a reagent bottle for liquid waste, a reagent bottle for a recycled driving liquid. The method comprises the steps of firstly adopting a forward permeable method to conduct concentration on a low concentration ammonia nitrogen water sample ready to be detected, then adopting a spectrophotometric method through the nessler reagent to conduct detection on the sample, so that low concentration ammonia nitrogen value can be precisely detected.

Description

technical field [0001] The invention relates to the field of forward osmosis and water quality detection, in particular to a low-concentration ammonia nitrogen detection technology for concentrated ammonia nitrogen, which can effectively concentrate the ammonia nitrogen in the water sample to be tested, and realize fast and accurate detection of low-concentration ammonia nitrogen with a concentration below 3.00 mg / L. ground detection. Background technique [0002] The ammonia nitrogen content of water refers to the free NH 3 and ammonium ion NH 4 + Nitrogen in the form of nitrogen is an important indicator reflecting the quality of water bodies. Free ammonia nitrogen will cause greater harm to a certain extent. Like COD, ammonia nitrogen is also the main oxygen-consuming pollutant in water. The oxidation and decomposition of ammonia nitrogen consumes dissolved oxygen in water, making the water black and smelly. The non-ionic ammonia in ammonia nitrogen is the main factor...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a low-concentration ammonia-nitrogen detection method and device for concentrated ammonia-nitrogen in order to solve the problem of low-concentration ammonia-nitrogen water sample detection accuracy and precision below 3.00 mg / L. Measure water samples to increase the concentration of ammonia nitrogen and improve the accuracy of low concentration ammonia nitrogen detection

Images