Nitrate Measurement in Seawater with a Turbidity Correction Algorithm based on Ultraviolet Spectrophotometry

Turbidity usually has a great impact on the actual measurement of the value of nitrate concentrations in the seawater. In this study, a new turbidity correction approach for nitrate concentrations measurement in the seawater based on ultraviolet absorption spectroscopy is presented. Experiments were...

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Bibliographic Details
Published in:Journal of physics. Conference series 2023-03, Vol.2464 (1), p.12027
Main Authors: Xu, Jian, Zhu, Xingyue, Zhang, Naixin, Yu, Kaixiong, Xu, Lei, Wu, Chi
Format: Article
Language:English
Subjects:
Absorbance
Absorption spectroscopy
Algorithms
Correlation coefficients
Physics
Seawater
Spectrophotometry
Turbidity
Ultraviolet absorption
Ultraviolet spectroscopy
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Summary:Turbidity usually has a great impact on the actual measurement of the value of nitrate concentrations in the seawater. In this study, a new turbidity correction approach for nitrate concentrations measurement in the seawater based on ultraviolet absorption spectroscopy is presented. Experiments were carried out to prove the improvement of the turbidity correction method with ultraviolet spectroscopy. The orthogonal projections to latent structures (O-PLS) algorithm was chosen to correct the additional information in absorbance caused by turbidity. The experimental results show that the influence of turbidity could be excellently removed. Compared with the standard normalized variate (SNV) transformation, the O-PLS algorithm could better reduce the influence of turbidity on the nitrate absorbance and improve the measurement accuracy in turbid seawater. The linear correlation coefficient (R 2 ) of the prediction results in test samples is 0.9999 and RMSEP is 0.1886 μmol/L.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/2464/1/012027