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Method for detecting potassium dichromate and ascorbic acid by using graphene quantum dot probe

A technology of graphene quantum dots and potassium dichromate, applied in the field of chemical detection, to achieve good biocompatibility, high fluorescence intensity, and sensitive detection effects

Inactive Publication Date: 2015-01-07
GUANGXI TEACHERS EDUCATION UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But so far, there are no relevant reports on the simultaneous detection of potassium dichromate and ascorbic acid using graphene quantum dot fluorescent probes

Method used

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  • Method for detecting potassium dichromate and ascorbic acid by using graphene quantum dot probe
  • Method for detecting potassium dichromate and ascorbic acid by using graphene quantum dot probe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Prepare four standard aqueous solutions, wherein the concentration of graphene quantum dots is 0.1mg / mL, and add potassium dichromate solution to the graphene quantum dot solution so that the final concentrations of potassium dichromate are 0, 5×10 -6 mol / L, 5×10 -5 mol / L and 5×10 -4 mol / L, let stand for 1min, and detect the fluorescence spectrum at 370-650nm at an excitation wavelength of 345nm, and obtain the fluorescence spectrum diagrams a, b, c and d in sequence.

[0028] Can know that the fluorescence intensity of graphene quantum dot probe weakens with the concentration of potassium dichromate solution from fluorescence spectrogram, and the reduction value of fluorescence intensity has good linear relationship with concentration of potassium dichromate solution, R 2 = 0.994.

[0029] The present invention utilizes the graphene quantum dot probe as a fluorescent probe to carry out highly sensitive detection of potassium dichromate, and there is a good linear rel...

Embodiment 2

[0031] Prepare four standard aqueous solutions, in which the concentration of graphene quantum dots is 0.1 mg / mL, and the concentration of potassium dichromate is 1×10 -3 mol / L, add ascorbic acid solution to the mixed solution of graphene quantum dots and potassium dichromate, so that the final concentration of ascorbic acid is 0, 5×10 -6 mol / L, 5×10 -5 mol / L and 5×10 -4 mol / L, let stand for 1min, and detect the fluorescence spectrum at 370-650nm at an excitation wavelength of 345nm, and obtain the fluorescence spectrum diagrams a, b, c and d in sequence.

[0032] a: The fluorescence spectrum when the concentration of graphene quantum dots is 0.1 mg / mL;

[0033] b: The concentration of graphene quantum dots is 0.1mg / mL, and the concentration of potassium dichromate is 1×10 -3 Fluorescence spectrum at mol / L;

[0034] c: The concentration of graphene quantum dots is 0.1mg / mL, and the concentration of potassium dichromate is 1×10 -3 mol / L, the final concentration of ascorbic...

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Abstract

The invention discloses a method for detecting potassium dichromate and ascorbic acid by using a graphene quantum dot probe. The method is characterized in that the graphene quantum dot probe is used as a fluorescence probe and by virtue of the characteristics that the fluorescence intensity of the graphene quantum dot probe weakens with the increasing of the concentration of a potassium dichromate solution and increases with the increasing of the concentration of an ascorbic acid solution, high-sensitivity detection is performed and the change value of the fluorescence intensity of the graphene quantum dot probe forms a good linear relationship with both the concentration of the potassium dichromate and the concentration of the ascorbic acid, with the correlation coefficients of 0.994 and 0.996 respectively. The method is easy and convenient to operate, rapid in detection, high in sensitivity and good in selectivity, and can perform online in-situ rapid and sensitive detection on the potassium dichromate and the ascorbic acid in a mixed sample.

Description

technical field [0001] The invention belongs to the technical field of chemical detection, and in particular relates to a method for detecting potassium dichromate and ascorbic acid by using a graphene quantum dot fluorescent probe. Background technique [0002] As we all know, potassium dichromate is a poisonous and carcinogenic strong oxidant, and it is widely used in chemical industry, match industry, enamel industry, glass industry, printing and dyeing industry and spice industry. The positive hexavalent chromium element in potassium dichromate is highly toxic, and the chromium that enters the human body is accumulated in human tissues, and the metabolism and removal speed are slow. Therefore, potassium dichromate is classified as a first-class carcinogen by the International Agency for Research on Cancer. Due to the inappropriate application of potassium dichromate, there are considerable residual potassium dichromate in the environment. Therefore, the analysis and de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64
Inventor 肖琦黄珊丘杭娜王鲁敏盛家荣苏炜朱发伟
Owner GUANGXI TEACHERS EDUCATION UNIV
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