Concentration self-adaption detection device and method for total nitrogen/total phosphorus of seawater

Abstract

The invention belongs to the technical field of marine environment monitoring and relates to an online monitoring and in-situ monitoring device and method for total nitrogen/total phosphorus of seawater. The detection device comprises a first flowing channel and a second flowing channel which are connected in sequence; the first flowing channel or the second flowing channel comprises a base, a light splitting assembly, LED light sources, a photodiode and a flowing pond; the light splitting assemblies and the flowing ponds are embedded in the bases; light through holes are formed between the light splitting assemblies and the flowing ponds; the LED light sources are optically connected with the light splitting assemblies; one photodiode is vertical to the LED light sources; the other photodiode is horizontal to the LED light sources; the optical length of the flowing pond of the first flowing channel is greater than that of the flowing pond of the second flowing channel. According to the device and method, the influence of light source fluctuation caused by other factors on the defection result can be eliminated, high sample concentration or low sample concentration can be measuredat a time, and the device and method have the advantages that a high-concentration sample does not need to be diluted, the structure is relatively compact, and the reference light intensity can be adjusted.

Description

technical field [0001] The invention belongs to the technical field of marine environment monitoring, and relates to an on-line monitoring and in-situ monitoring device and method for total nitrogen and total phosphorus in seawater. Background technique [0002] In the 21st century, mankind has entered a period of large-scale development and utilization of the ocean. my country is both a land power and a sea power. The red tides and Enteromorpha outbreaks that occur every year from south to north in my country's coastal areas are a hurdle that hinders the sustainable development of the ocean and the protection of the blue ocean. The main reason for this phenomenon is that the enrichment of nitrogen and phosphorus nutrients leads to water bodies Eutrophication. Therefore, real-time and accurate monitoring of the content of total nitrogen and total phosphorus in seawater can provide an important decision-making basis for protecting the ocean and controlling the deterioration ...

AI Technical Summary

Problems solved by technology

[0004] However, this process cannot guarantee that the intensity of the light source remains unchanged. Due to factors such as environmental fluctuations, temperature changes, signal fluctuations, and unstable power supply voltage of the light source LED, the intensity of the light source will vary from time to time, which will affect the true absorbance of the sample or Nitrogen and phosphorus content, the cost of ensuring almost constant light source intensity is relatively high

However, the flow cell with fixed optical path has too small absorbance when the sample concentration is low and is difficult to measure, and when the concentration is high, the absorbance is too high and it is not easy to measure. The sample needs to be diluted, which increases the detection time and reagent consumption. consumes the service life of the component

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