Parathion-methyl extraction and detection method based on N-octylpyridinium hexafluorophosphate electrode

A technology of octylpyridine hexafluorophosphate and methyl parathion, which is applied in the field of electrochemical sensing, can solve the problems of complicated modification steps and fragile membrane layers, and achieves simplified operation, stable structure, and simplified sample pretreatment process. Effect

Inactive Publication Date: 2014-05-14
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the modified electrode can improve the sensitivity, the modification steps are cumbersome, and the coated film layer is relatively fragile

Method used

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  • Parathion-methyl extraction and detection method based on N-octylpyridinium hexafluorophosphate electrode
  • Parathion-methyl extraction and detection method based on N-octylpyridinium hexafluorophosphate electrode
  • Parathion-methyl extraction and detection method based on N-octylpyridinium hexafluorophosphate electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Weigh 0.9 g of N-octylpyridine hexafluorophosphate and 0.1 g of carbon nanotubes and mix them uniformly to prepare an electrode. Immerse the prepared electrode in the solution to be tested, stir with a magnetic stirrer, and enrich for 1 minute to achieve extraction. Then the stirring was stopped, and the detection was carried out by cyclic voltammetry, the initial potential was 0.2V, and the scanning range was 0.2 to -0.8V. The result is as image 3 As shown, the dotted line is the blank control, and the solid line is the methyl parathion containing 1 μg / mL. In the scan of the first lap, peak a appears first, which is the reduction peak of methyl parathion, and the resulting product has reversible redox properties, so peak b appears, and then peak c appears in the second lap scan . The above results show that the electrode prepared by N-octylpyridinium hexafluorophosphate and carbon nanotubes has a good response to methyl parathion.

[0027] Figure 4 For the elect...

Embodiment 2

[0030] 0.6 g of N-octylpyridine hexafluorophosphate and 0.4 g of graphite powder were weighed and mixed uniformly to prepare an electrode. All the other are the same as implementation example 1, can realize the detection of methyl parathion, its detection effect is similar to embodiment 1.

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Abstract

The invention discloses a parathion-methyl extraction and detection method based on an N-octylpyridinium hexafluorophosphate electrode. The method comprises the following steps: immersing the N-octylpyridinium hexafluorophosphate electrode into a sample solution, and directly extracting and enriching parathion-methyl; after the extraction and enrichment are finished, with the N-octylpyridinium hexafluorophosphate electrode as a working electrode, a saturated Ag / AgCl electrode as a reference electrode and a platinum filament as an auxiliary electrode, detecting the parathion-methyl through an electrochemical cyclic voltammetry or a linear scanning method. According to the method, the sample pretreatment is greatly simplified, and the pesticide is directly extracted, concentrated and detected on the electrode. Furthermore, the whole electrode is formed by a uniform mixture, the structure is firm, and film falling problem is avoided. In addition, a new surface can be obtained by slightly polishing the electrode with weighting paper, so that measurement can be performed.

Description

technical field [0001] The invention relates to the technical field of electrochemical sensing, in particular to an electrode based on N-octylpyridine hexafluorophosphate for extraction, enrichment and detection of methyl parathion. technical background [0002] Methyl parathion is an organophosphorus pesticide, the main use is to control agricultural pests. Pesticides play an important role in agricultural production, but the problem of pesticide residues has become increasingly prominent due to their extensive use. Pesticides not only exist in crops, but also enter soil and water bodies, causing a series of problems in food and environment. [0003] Pesticide residue analysis mainly includes two parts: sample pretreatment and detection, of which the sample pretreatment time accounts for about 60% of the entire analysis method. Sample pretreatment includes a series of operational steps, such as homogenization, extraction, filtration or centrifugation, column chromatograph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/26G01N27/30G01N1/40
Inventor 唐文志吴坚
Owner ZHEJIANG UNIV
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