Simple correction method of calibration matrix for determining highly concentrated aqueous solution of salt-mixture by attenuated total-reflectance IR spectrometry.

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  • MAKABE Yumi
    Sea Water Science Research Laboratory, The Salt Industry Center of Japan
  • YOSHIKAWA Naohito
    Sea Water Science Research Laboratory, The Salt Industry Center of Japan

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Other Title
  • 全反射赤外減衰法による高濃度塩類混合溶液組成測定法　第２報　　全反射赤外減衰法による高濃度塩類混合溶液組成測定のための検量行列簡易補正法
  • 全反射赤外減衰法による高濃度塩類混合溶液組成測定のための検量行列簡易補正法
  • ゼン ハンシャ セキガイ ゲンスイホウ ニ ヨル コウノウド エンルイ コンゴウ ヨウエキ ソセイ ソクテイ ノ タメ ノ ケンリョウ ギョウレツ カンイ ホセイホウ

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Abstract

To develop an automated system for determining the concentrations of the components (CaCl2, MgCl2, KCl, NaCl) in the mother-liquid and the concentrated brine of the salt-manufacturing process, a procedure for accurately determining the concentration of each component by attenuated total-reflectance IR (ATR-IR) spectrometry and the multiple linear-regression (MLR) method was studied. Many calibration samples are necessary for obtaining significant determined values, because the MLR method requires the number of calibration samples to be more than the number of independent values (the number of pairs of wavenumbers). Therefore, a simple correction method for the calibration matrix of the MLR equation has been investigated. This correction method corrects the absorbance differences of a measured sample by using the absorbance differences of two standard samples. The average values of the mean errors of the determined values after correcting were lower than those in the case of not correcting. Therefore, an automated system for determining the concentrations of the components in the mother-liquid and the concentrated brine of the salt-manufacturing process using the automated calibration system is proposed. This correction method can be applied to other multivariate analyses (PLS method, etc.) and other spectrophotometric analyses (visible, ultraviolet, near infrared, fluorometry, etc.).

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 50 (11), 759-762, 2001

    The Japan Society for Analytical Chemistry

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