The purpose of the present invention is to provide a measurement method and measurement device that make it possible to accurately measure the concentrations of various metals included in a liquid to be measured that includes a plurality of additives and metals. This X-ray fluorescence analysis measurement method employs measured X-ray fluorescence intensity values to measure the metal concentration of each metal to be measured included in a liquid to be measured that includes one or more types of additives and metals. This X-ray fluorescence analysis measurement method comprises: a calibration-curve-polynomial determination step S11 for determining polynomial approximations of calibration curves for the metals to be measured, a liquid-type-correction-polynomial determination step S12 for determining polynomial approximations for correcting error in the measured X-ray fluorescence intensity values for the metals to be measured resulting from additive inclusion, a specific-gravity-correction-polynomial determination step S13 for determining polynomial approximations for correcting error in the measured X-ray fluorescence intensity values for the metals to be measured resulting from differences in specific gravity of the liquid to be measured, and a metal concentration measurement step S14 for using the polynomial approximations determined in the calibration-curve-polynomial determination step, liquid-type-correction-polynomial determination step, and specific-gravity-correction-polynomial determination step to measure the metal concentrations of the metals to be measured.
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