Method for fluorescently detecting pH value through pH test paper

Abstract

The invention relates to a method for fluorescently detecting the pH value through pH test paper and mainly sets forth a pH value detection method, different from a pH test paper color observation manner, based on the pH test paper. The method for fluorescently detecting the pH value through the pH test paper comprises the steps of firstly acquiring a relation function between fluorescence spectrum parameters of the pH test paper and a pH value of liquid as a fluorescence pH sensing equation, dipping the same type of the pH test paper into to-be-tested liquid with an unknown pH value, drying the moistened and developed pH test paper, measuring the fluorescence spectrum parameters of the pH test paper, and substituting the fluorescence spectrum parameters into the relation function between the fluorescence spectrum parameters of the pH test paper and the pH value of the liquid, so as to obtain the pH value of the to-be-tested liquid. The method for fluorescently detecting the pH value through the pH test paper has the advantages that the pH test paper used in the testing process can be preserved for a long time and repeatedly verified; the detection process can be far from a site in which corrosive liquid exists; compared with a manner of judging the colors of the moistened test paper, the pH detection precision of the method is relatively high.

Description

technical field [0001] The invention relates to an optical measurement method of pH value, in particular to a method for detecting pH value through fluorescence of pH test paper. Background technique [0002] The measurement methods of pH value mainly include indicator method, electrochemical method and optical sensor method, etc. The most commonly used, most convenient and cheapest pH test paper measurement belongs to the indicator method. Infiltration, the test paper will show the color corresponding to the pH value of the liquid to be tested, and then compare to find the standard color card of the same color, the standard color card gives the corresponding pH value of different colors. However, the color of the test paper is not obvious in the weak pH liquid, there are errors in the subjective judgment of the same color, the color rendering index of ambient light will affect the judgment of the color, and the standard color chart and test paper may fade. These factors lea...

AI Technical Summary

Problems solved by technology

However, the color of the test paper is not obvious in the weak pH liquid, there are errors in the subjective judgment of the same color, the color rendering index of ambient light will affect the judgment of the color, and the standard color chart and test paper may fade. These factors lead to the pH of the test paper method. The detection accuracy is low

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