| 摘要 |
PROBLEM TO BE SOLVED: To enable quantitative determination of a metal ion by measuring absorbance at a wavelength in an absorption spectral band width of a coloring matter or a water soluble dye and substituting a specific equation with the measured absorbance. SOLUTION: The coloring matter or water soluble dye is either one which forms a complex at a ratio with a metal ion in a solution which is a target to be quantitatively measured and the metal ion is a free ion, which is not bonded with a different material co-existent in the solution. An absorbance Ea at wavelength (a) in the absorption spectral band width of the coloring matter or the water soluble dye is measured and an equation is substituted with the measured absorbance Ea to obtain P as a quantitative value of the metal ion, whereεa1 is a molar absorption coefficient of a coloring matter,εa2 is a molar absorption coefficient of the coloring matter which has formed a complex with a metal to be measured andεa is a molar absorption coefficient of a sample solution containing the coloring matter at a wavelength (a).
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