Water quality analysis system, sensor module, calibration machine, and method for calibrating water quality analysis system

A water quality analysis system that measures a concentration of a component contained in a liquid sample by a fluorescence spectroscopy, comprising

• a light irradiation section that irradiates the liquid sample with a light having an excitation wavelength of the component,
• a light detection section that detects fluorescence of the component-to be measured emitted from the liquid sample,
• a sensor head that houses the light irradiation section and the light detection section, and that is immersed in the liquid sample,
• a calculation unit that calculates a concentration of the component by using a fluorescence intensity obtained by the light detection section, and
• a fluorescence reference member that is arranged on an optical path between the light irradiation section and the light detection section during calibration of the water quality analysis system, wherein
• the fluorescence reference member is detachably mounted on the sensor head,
• the fluorescence reference member emits fluorescence upon excitation by the light irradiation section, and
• the fluorescence reference member is solid, non-toxic, and not subject to photodegradation.