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a kind of EU 3+ Selective quantitative detection method for

A quantitative detection method and selective technology, applied in the field of electrochemical analysis, can solve the problems of high detection limit and low sensitivity of carbon paste electrodes, and achieve the effects of improving selectivity and sensitivity, fast response, and enhancing response sensitivity

Active Publication Date: 2020-03-31
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the detection limit of carbon paste electrodes is usually higher and the sensitivity is lower

Method used

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  • a kind of EU <sup>3+</sup> Selective quantitative detection method for
  • a kind of EU <sup>3+</sup> Selective quantitative detection method for
  • a kind of EU <sup>3+</sup> Selective quantitative detection method for

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1 (preparation of PDA / IIPs-CP electrode)

[0032] The specific process and steps in this embodiment are as follows:

[0033] (1) Eu 3+ Imprinted polymer (Eu 3+ -Preparation of IIPs): The preparation of europium ion imprinted polymer is based on magnetic Fe 3 o 4 As a carrier, it is prepared by surface imprinting polymerization. The specific steps are as follows: add 0.1mmolEuCl to a 50mL round bottom flask 3 , 0.4mmol functional monomer acrylamide, 50mg magnetic nano-iron oxide and 15mL porogen methanol, placed in a constant temperature oscillator at 25°C at 120r·min -1 Oscillating at a high speed for 3 hours to fully pre-polymerize the monomer and the template. Then add 4 mmol of cross-linking agent EGDMA and 10 mg of initiator AIBN to the pre-polymerization solution, ultrasonically dissolve AIBN, deoxygenate with nitrogen gas for 5-8 minutes, cover the lid and connect a syringe with a nitrogen-filled balloon to prevent explosion, and then put the circ...

Embodiment 2

[0039] Embodiment 2 (selectivity, reproducibility and stability test of PDA / IIPs-CP electrode)

[0040] In order to verify the selectivity of the PDA / IIPs-CP electrode, this example detects Eu in the presence of some common metal ions 3+ The DPV peak height is shown for a concentration of 3.0×10 -5 mol L -1 Eu 3+ , 200 times of alkali metals and alkaline earth metals, 30 times of Fe 3+ 、Cu 2+ 、Co 3+ , Zn 2+ and Ni 2+ , 10 times the interference of other rare earth ions on europium ions is within 5%, indicating that the electrode prepared by the method of the present invention has good selectivity and anti-interference ability. The experiment further studied the reproducibility and stability of the PDA / IIPs-CP electrode. -5 mol L -1 Eu 3+ Parallel measurement was performed 5 times, and its relative standard deviation (RSD) was within 4.6%; 5 PDA / IIPs-CP electrodes were prepared using the same method and 3.0×10 -5 mol L -1 Eu 3+ Detected, its RSD≤5%; the PDA / IIPs-CP...

Embodiment 3

[0041] Embodiment 3 (PDA / IIPs-CP electrode detects to actual sample)

[0042] In this embodiment, the PDA / IIPs-CP sensor of the present invention is used for local lake water and tap water detection, and the test results show that: Cuihu water, Panlong River water, and tap water do not contain Eu 3+ , or where Eu 3+ The content is lower than the detection limit of the sensor (4.0×10 -7 mol L -1 ). When testing Cuihu water, Panlongjiang water and tap water, add 2 μmol L by standard addition method -1 Eu 3+ After that, the standard addition recovery rate was between 93.5% and 102.5%, and the relative standard deviation was ≤4.6%. It shows that the sensor prepared by the method of the present invention has certain practicability.

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Abstract

The invention discloses a selective quantitative detection method for Eu<3+>. According to the selective quantitative detection method, a linear relation graph of different Eu<3+> concentrations is drawn by measured peak current through a differential pulse voltammetry (DPV), and a standard working curve is obtained; a linear equation obtained by the standard curve is logI(muA)=1.0515*logC(mumol.L<-1>)-0.8898 (r=0.9901) and the detection limit is 4.0*10<-7>mol.L<-1>; a modified carbon paste electrode prepared by the invention is used for determining the peak current of a solution and the Eu<3+> can be quantitatively analyzed and determined. The selective quantitative detection method has the characteristics that polydopamine is modified on the surface of the carbon paste electrode filled with Eu<3+> imprinted polymers through electric polymerization and dopamine is used as a sensitivity enhancement material, so that the selectivity and sensitivity of the carbon paste electrode on Eu<3+> detection are improved. Meanwhile, a differential pulse adsorptive stripping voltammetry (DPASV) is used as a detection technology and a method capable of rapidly detecting the Eu<3+> in the presence of interfering ions is established. The modified carbon paste electrode provided by the invention has the advantages of simplicity in preparation, rapid response and good selectivity and repeatability; the surface of the carbon paste electrode is easy to update and the service life is long.

Description

technical field [0001] The invention belongs to the technical field of electrochemical analysis, in particular to a Eu 3+ selective quantitative detection method. Background technique [0002] Europium (Eu) is an important rare earth element with unique optical properties, its melting point is only higher than that of mercury, and it is the rare earth element with the lowest density. Europium is mainly represented by Eu 3+ or Eu 2+ Exist, because europium is the most active metal among rare earth elements, so Eu 2+ easily oxidized to Eu 3+ , the common state in nature is Eu 3+ . In recent years, europium has important applications in many fields such as agriculture, materials science, electronics, and life sciences. With the increasing application of europium, its toxic and side effects are becoming more and more known. Too much europium will not only pollute the environment, but also cause harm to human health through the enrichment of the food chain, even if the co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/48
CPCG01N27/48
Inventor 曹秋娥陈瑾白慧萍
Owner YUNNAN UNIV