Spectroscopic seawater nitrate concentration detection method

Abstract

The invention discloses a spectroscopic seawater nitrate concentration detection method which comprises the following steps: 1) measuring a seawater spectrum by using an ultraviolet spectrophotometry,and calculating absorbance to obtain an ultraviolet absorption spectrum of seawater; 2) carrying out smoothing pretreatment on the seawater ultraviolet absorption spectrum; 3) sequentially carrying out seawater chloride ion, bromide ion and turbidity interference deduction on the absorption spectrum; and 4) establishing a partial least squares model by utilizing the absorption spectrum subjectedto smooth pretreatment and interference deduction, and optimizing selection of a modeling waveband to obtain a seawater nitrate concentration partial least squares method final meter. The spectroscopic seawater nitrate concentration detection method provided by the invention can effectively reduce errors caused by random noise when the seawater nitrate concentration is measured by the spectrography, can reduce interference caused by other substances with absorption to an ultraviolet band in seawater, and can improve the nitrate concentration prediction precision.

Description

technical field [0001] The invention relates to a seawater quality parameter detection technology, in particular to a seawater nitrate concentration detection method by spectroscopic method. Background technique [0002] Nitrate is an important nutrient salt and one of the important indicators of marine pollution monitoring. Excessive nitrate content in seawater will lead to eutrophication of the water body, a large number of algae blooms, harmful toxins and hypoxia in the water body. Fish and shrimp death, causing red tides in severe cases. The nitrate concentration measurement based on the chemical method is complicated to operate and has the problem of secondary pollution, while the nitrate concentration measurement based on the spectroscopic method has a short time and no chemical pollution, which has unique advantages in long-term monitoring. [0003] The traditional measurement of nitrate concentration based on ultraviolet absorption spectroscopy usually cannot deal w...

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Problems solved by technology

[0004] Aiming at the shortcomings of the prior art in the seawater nitrate concentration detection process, such as large influence of interference substances, poor model accuracy, and low performance, the problem to be solved by the present invention is to provide a method that can deduct the influence of interference substances, reduce the complexity of the model and calculate A spectroscopic seawater nitrate concentration detection method that improves the quantity and improves the prediction accuracy of the model at the same time

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