The invention discloses a
lanthanide metal europium ion complex probe-based method for detecting a pH value. The detection method mainly comprises the following steps: firstly, carrying out
fluorescence intensity scanning on a to-be-detected sample A including
lanthanide metal europium ion complexes and solutions with different pH values; observing the change of the
fluorescence intensity, and carrying out quantitative detection on the pH values of the solutions, so as to obtain a linear interval between the pH values and the
fluorescence intensity; and detecting the
fluorescence intensity of a to-be-detected sample B including the
lanthanide metal europium ion complexes and a to-be-detected
water body sample, so as to obtain the pH value of the to-be-detected
water body sample. The method disclosed by the invention is capable of achieving the detection effect of a traditional method, and has good selectivity, high response speed, short detection time, simplicity of operation and low price; a time-resolved fluorescence
signal is strong and stable; and the
repeatability of an experimental method and the recognizable degree of the fluorescence
signal in a complicated environment are ensured, so that the ultimate practicability of the detection method is powerfully guaranteed.