Electrochemical method for sensitively detecting glyphosate

A sensitive detection and glyphosate technology, applied in the field of electrochemistry, can solve the problems of low molecular weight and easy complexation, insolubility in organic solvents, difficult detection of glyphosate, etc., and achieves high sensitivity, few operation steps, and detection limit. low effect

Inactive Publication Date: 2017-09-01
UNIV OF JINAN
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Problems solved by technology

However, since its effects have no specific target organisms, the full environmental impact has not been fully studied, and its widespread use for environmental safety should be taken seriously
Due to the ionic properties, stability, high water solubility, insolubility in organic solvents, low molecular weight and easy complexation tendency of glyphosate, it is difficult to detect glyphosate at a concentration below 1 μg / L

Method used

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  • Electrochemical method for sensitively detecting glyphosate
  • Electrochemical method for sensitively detecting glyphosate

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Embodiment 1

[0026] 1 Polyacrylamide membrane (PAM) is used to modify the glassy carbon electrode and use the constant potential deposition polypyrrole method to fix the modified material. The specific steps are:

[0027] (1) Glassy carbon electrode (d = 4 mm) through 0.05 μm A1 2 o 3 After powder polishing, rinse with ultrapure water, then ultrasonically wash with ethanol and ultrapure water for 2 min respectively, place the cleaned electrode at room temperature to dry, and add 10 μL of 0.0568 g / mL acrylamide dropwise on the bare glassy carbon electrode , and put it under an infrared lamp to dry and form a polyacrylamide film on the electrode surface to obtain a polyacrylamide glassy carbon electrode (PAM / GCE)

[0028] (2) Add 5 mL of pure water and 6.9 μL of pyrrole to 5 mL of 0.5 mol / L sulfuric acid solution, stir magnetically for 10 min, and pass nitrogen gas through the solution for 10 min; use PAM / GCE as the working electrode and Ag / AgCl electrode as the reference electrode, The pl...

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Abstract

The invention relates to the technical field of glyphosate analytic determination, in particular to an electrochemical method for sensitively detecting glyphosate. According to the method, PAM (polyacrylamide) is used for modifying a glassy carbon electrode; a modification material is fixed by a constant potential deposition polypyrrole method; according to the adsorption effect of the PAM on the glyphosate, potassium ferricyanide is used as an electrochemical signal for detecting the glyphosate. The modification electrode has high stability, good repeatability and high selectivity; the preparation procedure is simple; the cost is lower; the environment pollution is low.

Description

technical field [0001] The invention relates to the technical field of glyphosate analysis and determination, in particular to a polyacrylamide-modified glassy carbon electrode and a constant potential deposition polypyrrole method to fix the modified material. According to the adsorption of polyacrylamide to glyphosate, ferricyanide An electrochemical method for the detection of glyphosate using potassium chloride as a signal probe. Background technique [0002] Glyphosate is an important herbicide and is a broad-spectrum, non-selective herbicide used to control long grass and broadleaf weeds. It affects the formation of amino acids and other chemicals in plants. Glyphosate has three functional groups, namely amino group, carboxyl group and phosphoric acid group. These groups will form stable complexes with metal ions, especially transition metal ions, and will attract each other with corresponding functional groups, such as carboxyl group and hydroxyl group. . Due to it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/48
CPCG01N27/48
Inventor 乔雪莹周长利陈月
Owner UNIV OF JINAN
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