An electrochemical method for sensitive detection of glyphosate

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

Inactive Publication Date: 2019-01-22
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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  • An electrochemical method for sensitive detection of glyphosate
  • An electrochemical method for sensitive detection of glyphosate

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Embodiment 1

[0024] 1 Polyacrylamide membrane (PAM) modifies the glassy carbon electrode and fixes the modified material by the constant potential deposition polypyrrole method. The specific steps are:

[0025] (1) Glassy carbon electrode (d = 4 mm) through 0.05 μm A1 2 O 3 After the powder is polished, rinse it with ultrapure water, and then ultrasonically wash with ethanol and ultrapure water for 2 minutes. The cleaned electrode is dried at room temperature, and 10μL of 0.0568g / mL acrylamide is added dropwise to the bare glassy carbon electrode. , And put it under the infrared lamp to dry it to form a polyacrylamide film on the electrode surface to obtain polyacrylamide glassy carbon electrode (PAM / GCE)

[0026] (2) Take 5 mL of pure water and 6.9 μL of pyrrole into 5 mL of 0.5 mol / L sulfuric acid solution, stir magnetically for 10 minutes, and let the solution flow with nitrogen for 10 minutes; use PAM / GCE as the working electrode and Ag / AgCl electrode as the reference electrode. The platinu...

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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 glassy carbon electrode modified with polyacrylamide and fixed with a constant potential deposition polypyrrole method to fix the modified material. According to the adsorption effect of polyacrylamide on glyphosate, ferricyanide is used Potassium is an electrochemical method for detecting glyphosate as a signal probe. Background technique [0002] Glyphosate is an important herbicide and a broad-spectrum, non-selective herbicide used to control long grasses and broad-leaved weeds. It affects the formation of amino acids and other chemicals in plants. Glyphosate has three functional groups, namely amino, carboxyl and phosphate. These groups will form stable complexes with metal ions, especially transition metal ions, and will also attract each other with corresponding functional groups, such as carboxyl and hydroxyl. . Due to its relatively low toxic...

Claims

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Application Information

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Patent Type & Authority Patents(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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