Recently, near-IR spectroscopic measurements of electrolytes in aqueous solutions have been explored. The basis for this technique is the perturbations of electrolytes on the near-IR water bands. Both measurements of a single electrolyte and simultaneous measurements of several electrolytes have been investigated. Determination of seawater salinity is also possible. Most of these measurements were made in the near-IR region from 1100 to 2500 nm. In contrast, the short-wavelength near-IR region from 700 to 1200 nm has received much less attention.

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