Method for fluorescent detection of trace uranyl ions

Abstract

The invention relates to a method for fluorescent detection of trace uranyl ions. The method comprises the following steps: (a) adding aesculin and a mesoporous molecular sieve into an aqueous solution containing uranyl ions and carrying out fluorescent detection to obtain the fluorescence intensity of the aqueous solution; (b) preparing a solution not containing uranyl ions and measuring the fluorescence intensity F<0> of the solution; (c) preparing a solution containing uranyl ions with a different concentration and measuring the fluorescence intensity F<n> of the solution; (d) drafting a curve with F<0> / F<n-1> as a vertical coordinate and the concentration of uranyl ions as a horizontal coordinate; (e) carrying out diluting according to the proportion of the aqueous solution obtained inthe step (a) until the concentration corresponding to the measured fluorescence intensity of the aqueous solution is in a range of 0.001 to 0.05 [mu]mol / L according to the curve drawn in the step (d), and multiplying the concentration by a multiple of the dilution. The method can accurately determine the concentration of uranyl ions in aqueous solutions and has a detection limit of as low as 6 nM.

Description

technical field

[0001] The invention relates to the field of radioactive substance detection, in particular to a method for fluorescence detection of trace uranyl ions. Background technique

[0002] With the depletion of traditional non-renewable energy such as coal and oil, clean energy represented by nuclear energy is becoming more and more popular and used more and more worldwide. One of the main raw materials of nuclear energy is uranium, so the probability of human beings being exposed to the threat of uranium is increasing. The threat of uranium comes from its own radioactive toxicity and chemical toxicity. Once it touches or enters the human body, it will cause serious damage to human organs and bodies. High doses of uranium are also harmful to the environment. Under aerobic or hypoxic conditions, the most stable form of uranium in aqueous solution is the uranyl ion UO 2 2+ , which has a certain solubility in water, so it can migrate freely in the environment. Th...

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