Calibration method of measurement temperature of concentration measurement apparatus, and concentration measurement apparatus

A calibration method of a measurement temperature of a concentration measurement apparatus performing, based on measurement of a temperature and a transmittance or an absorbance, concentration measurement on a sample having a correlation between a temperature, a transmittance or an absorbance, and a concentration, the calibration method comprising:

• acquiring first correlation information between a temperature and a transmittance or an absorbance based on a sample having a known concentration;
• measuring, over time, values related to the temperature, the transmittance or the absorbance, and an environmental temperature of the sample having the known concentration by the concentration measurement apparatus, the concentration measurement apparatus including a sample temperature sensor, an optical sensor, and an environmental temperature sensor;
• acquiring second correlation information between first difference information and second difference information, the first difference information being information between a measurement value of the environmental temperature and a measurement value of the temperature of the sample, the second difference information being information between a theoretical temperature based on the first correlation information with respect to a measurement value of the transmittance or the absorbance and the measurement value of the temperature of the sample having the known concentration;
• in temperature measurement of a sample having an unknown concentration in concentration measurement of the sample, acquiring difference information between a measurement value of a temperature of the sample measured by the sample temperature sensor and a measurement value of an environmental temperature measured by the environmental temperature sensor, and acquiring calibration temperature information based on the second correlation information with respect to the difference information;
• and
• calibrating the measurement value of the temperature of the sample by using the calibration temperature information.