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Optica Publishing Group
  • Applied Spectroscopy
  • Vol. 57,
  • Issue 11,
  • pp. 1399-1406
  • (2003)

Main Inorganic Component Measurement of Seawater Using Near-Infrared Spectroscopy

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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<sup>-</sup>, Na<sup>+</sup>, K<sup>+</sup>, SO<sub>4</sub><sup>2-</sup>, and Ca<sup>2+</sup>) could be predicted with good accuracy using NIR spectra and their second derivatives. For Cl<sup>-</sup> ion and K<sup>+</sup> ion concentrations, the accuracy was high.

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