Online total nitrogen analyzer and detection method thereof

Abstract

The invention relates to an online total nitrogen analyzer and a detection method thereof. The online total nitrogen analyzer comprises a peristaltic pump for providing sampling power, a metering module, a multiport valve, high-temperature and high-pressure valves, a detection module, and a high-temperature decomposition module, which are connected through a pipeline. The peristaltic pump is communicated with the metering module through the pipeline; the upper end of the metering module is communicated with the peristaltic pump, and the lower end is communicated with the multi-way valve; the multiport valve is communicated with a common pipeline of the metering module, the high-temperature decomposition module, the detection module, and a water sample, a measuring scale, a zero scale, liquid waste and at least one reagent pipeline in a reagent bin through different pipelines; the high-temperature and high-pressure valves are arranged at the upper and lower ends of the high-temperature decomposition module respectively, the lower end is communicated with the multiport valve, and the upper end is communicated with air. The online total nitrogen analyzer is small and compact in overall size, and simple in structure; the optical path design can eliminate interference of organic matters, the usage of the water sample and reagents is small, the treatment cost of the liquid waste is low, the expiration date of the reagents is long, the measurement is accurate, and the detection environment is stable.

Description

technical field [0001] The invention relates to an online water quality monitoring instrument in the field of environmental online monitoring, and more particularly, to an online total nitrogen analyzer and a detection method thereof. Background technique [0002] Total nitrogen is the sum of inorganic nitrogen and organic nitrogen such as ammonia nitrogen, nitrate nitrogen, and nitrite nitrogen in water. When there are excessive nitrogen substances in lakes and reservoirs, phytoplankton will flourish and eutrophication will occur; it will promote the accelerated reproduction of organisms and microorganisms, resulting in the reduction of dissolved oxygen in the water and the rapid deterioration of water quality. Certain nitrogenous compounds have toxic effects on humans and other organisms. Total nitrogen is one of the important indicators to measure the degree of water pollution and eutrophication, and it is of great significance to accurately determine the total nitrogen ...

AI Technical Summary

Problems solved by technology

At the same time, in the actual sample determination process, this method has the following disadvantages: long digestion time; there is a certain risk in the operation process; the experimental water, reagents, glassware and surrounding environment are required to be free from ammonia pollution, and the blank value is very strict.

[0006] 1. Use a xenon lamp as the light source, and use a wavelength of 220nm to measure the absorbance of total nitrogen. If the wavelength of 275nm is not used, the interference caused by dissolved organic matter cannot be eliminated.

Compared with the national standard method, the measured value is too large

[0007] 2. The amount of water samples and reagents is large, which leads to a large amount of waste liquid, which increases the workload of operation and maintenance personnel and the cost of waste liquid treatment

[0008] 3. The alkaline potassium persulfate solution used as an oxidant has a short shelf life and needs to be replaced frequently

[0009] 4. Poor accuracy and stability, unable to meet the requirements of measuring low concentration samples

Images