Main Inorganic Component Measurement of Seawater Using Near-Infrared Spectroscopy

Abstract

The potential of near-infrared (NIR) spectroscopy to measure the main inorganic components of seawater as salt-manufacturing materials was investigated. A total of 72 seawater samples collected from six locations was used, and spectra (1100-1800 nm) were acquired by a NIR spectrophotometer with a 1-mm path length. Principal component analysis (PCA), canonical correlation analysis (CCA), and partial least-squares (PLS) regression were performed based on the reference inorganic components. As a result, the principal component analysis and canonical correlation analysis showed that the near-infrared spectra could be related to the inorganic components of seawater. The partial least-squares regression analysis showed that the inorganic components (ion concentration of Cl, Na+, K+, SO4(2-), and Ca2+) could be predicted with good accuracy using NIR spectra and their second derivatives. For Cl ion and K+ ion concentrations, the accuracy was high.

Analysis of Carbonyl Value of Frying Oil by Fourier Transform Infrared Spectroscopy

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“…The first derivative of the raw spectra is simply a measure of the slope of the spectral curve at every point and the second derivative is a measure of the change in the slope of the curve. The slope of the curve is not affected by baseline offsets in the spectrum, and thus using the first and second derivatives are very effective methods for removing baseline offsets 22,23 . This may be why relatively better results were obtained based on the first or second derivative spectra.…”

Prediction of moisture, calorific value, ash and carbon content of two dedicated bioenergy crops using near-infrared spectroscopy

“…The model statistics suggest a poor model only suitable for very rough screening. However previous studies have shown that it is possible to determine inorganic compounds using NIR spectroscopy (Chen et al, 2003). The first three loading in the model (Fig.…”

Determination of the Carbonyl Values for Frying Rapeseed Oil Using Near-Infrared Spectroscopy

“…The first-and secondderivative spectra (Duckworth 2004;Chen et al 2003Chen et al , 2004 were obtained by the Savitsky-Golay method (Madden 1978) with a segment of 20 nm and a gap of 0 nm. The PLS regression and derivative mathematical treatments were carried out using the Unscrambler Ver.7.6 software.…”