title: 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.
authors.affiliation: Faculty of Bioresource Sciences, Akita Prefectural University, Akita, 010-0195 Japan. jychen@akita-pu.ac.jp
authors.forename: Jie Yu
authors.initials: JY
authors.lastname: Chen
authors.forename: Ryuji
authors.initials: R
authors.lastname: Matsunaga
authors.forename: Kyoko
authors.initials: K
authors.lastname: Ishikawa
authors.forename: Han
authors.initials: H
authors.lastname: Zhang
mesh_terms: D000465:Algorithms; D007287:Inorganic Chemicals / Q000032:analysis* / Q000737:chemistry*; D007564:Japan; D025341:Principal Component Analysis; D012623:Seawater / Q000032:analysis* / Q000737:chemistry*; D012680:Sensitivity and Specificity; D013055:Spectrophotometry, Infrared / Q000379:methods*
chemical_list: D007287:Inorganic Chemicals