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Method for rapidly detecting iron elements based on carbon quantum dot fluorescence method

A technology for carbon quantum dots and iron elements, which is applied in the field of rapid detection of trace elements by fluorescence method, can solve problems such as complex synthesis process, and achieve the effects of simple pretreatment, simple process and wide applicability

Active Publication Date: 2018-06-12
JIANGNAN UNIV
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Problems solved by technology

However, so far, the carbon quantum dot method mainly focuses on the detection of ferric iron, and the synthesis process is complicated, requiring surface modification and purification in multiple stages

Method used

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  • Method for rapidly detecting iron elements based on carbon quantum dot fluorescence method
  • Method for rapidly detecting iron elements based on carbon quantum dot fluorescence method
  • Method for rapidly detecting iron elements based on carbon quantum dot fluorescence method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The detection of iron in the iron supplement oral liquid of embodiment 1

[0037] (1) Synthesis of carbon quantum dots

[0038] Weigh 1 g of L-ascorbic acid and dissolve it in 25 mL of ultrapure water, then add 25 mL of absolute ethanol, stir evenly, and transfer the solution to a 100 mL polytetrafluoroethylene-lined hydrothermal reaction kettle. It was placed in an oven and heated at 180°C for 4 hours, then taken out, and naturally cooled to room temperature. The obtained carbon quantum dot solution was diluted 100 times with 0.2M phosphate buffer solution (pH=7), and the concentration at this time was 0.2 mg / mL.

[0039] (2) Drawing of standard curve for iron detection by carbon quantum dots

[0040] Take 800 μL of phosphate buffer (pH=7), add 100 μL of diluted carbon quantum dot solution, and then add 100 μL of ferrous ion solutions of various concentrations to prepare ferrous iron containing 20 μM, 40 μM, 60 μM, 80 μM, There are seven kinds of reaction solution w...

Embodiment 2 3

[0054] The detection of embodiment 2 ferric iron

[0055] (1) Synthesis of carbon quantum dots

[0056] With embodiment 1.

[0057] (2) Drawing of standard curve for iron detection by carbon quantum dots

[0058] Take 800 μL of phosphate buffer (pH=7), add 100 μL of diluted carbon quantum dot solution, and then add 100 μL of ferric ion solutions of various concentrations to prepare ferric iron 20 μM, 40 μM, 60 μM, 80 μM, There are seven kinds of reaction solution with 100μM, 200μM and 400μM concentrations.

[0059] The parameters of the fluorescence photometer used in this experiment are:

[0060]

[0061] Take 400 μL of the reaction solution and put it into a fluorescence cuvette, and detect it in a fluorescence photometer. Each sample gets the intensity under its peak value (that is, the emission wavelength is the intensity under 380nm) as the data of the linear curve, which is drawn as figure 2 Standard curve shown in black circle.

[0062] (3) Sample testing

[00...

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Abstract

The invention discloses a method for rapidly detecting iron elements based on a carbon quantum dot fluorescence method, and belongs to the technical field of rapid detection of trace elements by meansof a fluorescence method. Carbon quantum dots are prepared through L-ascorbic acid and ethyl alcohol, no further purification or surface modification is needed, and the method is suitable for detecting the iron elements including ferrous iron and ferric iron. The method has the advantages that the carbon quantum dot preparing process is simple, cost is low, and applied materials are green and free of toxin and have no toxic or side effects on the environment; the linear range of iron detection is wide from 0 micron to 400 micron, and the detection limit is as low as 2.52 micron; sample preprocessing is simple, and no strong acid digestion is needed; ferrous iron and ferric iron can be detected at the same time, and the application range is wide.

Description

technical field [0001] The invention relates to a method for rapidly detecting iron elements based on a carbon quantum dot fluorescence method, and belongs to the technical field of rapidly detecting trace elements by fluorescence methods. Background technique [0002] Iron is one of the essential trace elements in the human body. It is one of the main components of hemoglobin and heme. It is the cause of iron deficiency anemia. It is also a component of many enzymes and an activator of redox enzymes. It has extremely important biological functions. learning function. Therefore, the market is full of various iron supplements or iron-fortified health foods to meet people's iron supplement needs. The iron element in these health products and the iron element required by hemoglobin in the human body are all in the form of divalent iron. [0003] At the same time, the water used in printing and dyeing, textile, papermaking and other industries has high requirements for iron co...

Claims

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Application Information

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IPC IPC(8): G01N21/64
CPCG01N21/643G01N2021/6439
Inventor 席金忠谢云飞郭亚辉成玉梁于航钱和姚卫蓉
Owner JIANGNAN UNIV
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