Method for determining cadmium in water sample based on fluorescein-PAN fluorescence method

Abstract

The invention belongs to the technical field of cadmium determination, and discloses a method for determining cadmium in a water sample based on a fluorescein-PAN fluorescence method. The method is characterized in that an ammonia water-ammonium chloride buffer solution of which the pH is 9.75 is used, and the dosage is 0.70mL; the PAN concentration is 9.68*10<-5>mol.L<-1>; the fluorescein concentration is 1.0*10<-5>mol.L<-1>; the reaction time is 15min. The method is easy to operate, is sensitive, rapid, economical and practical, can be applied to actual detection, and has consistent results with an international graphite furnace atomic method (t-test). In the method, energy transfer can be performed between PAN and FR in a buffer solution medium, thereby causing fluorescence quenching of the FR; after Cd(II) is added into a system, the quenching degree of the FR is strengthened, and a novel method for detecting cadmium in an environmental water sample is established. A certain experimental basis and a technical method are provided for the detection of heavy metals in the environment.

Description

technical field [0001] The invention belongs to the technical field of cadmium determination, and in particular relates to a method for determining cadmium in water samples based on a fluorescein-PAN fluorescence method. Background technique [0002] Cadmium (Cd) is a heavy metal widely used in industrial processes such as metal plating, colorants, and rechargeable NiCd batteries. At the same time, cadmium is a highly toxic substance that can cause serious environmental and health problems. Long-term excessive exposure to cadmium can cause chronic poisoning. It can accumulate in the cells of organisms, such as the lungs, prostate, and cause cancer of the kidneys and Other diseases can have serious effects on both humans and organisms. Cadmium is extremely toxic and can be found in many products such as plastics, fossil fuel combustion, cosmetics, water resources and gas. Severe cadmium poisoning can cause symptoms such as spinal deformity, bone embrittlement, and internal ...

AI Technical Summary

Problems solved by technology

However, the research on Cd(Ⅱ)-fluorescein-PAN as the reaction system has not been reported after reviewing domestic and foreign literature.

[0005] To sum up, the current methods for detecting cadmium have more or less deficiencies, such as relatively low accuracy, relatively low sensitivity, relatively high detection cost, etc.

Images