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A method for detecting the concentration of benzoic acid by using a modified glassy carbon electrode

A glassy carbon electrode and benzoic acid technology, applied in the field of electroanalytical chemistry, can solve the problems of slow analysis process, expensive equipment, long analysis time, etc., and achieve the effect of simple operation, good reproducibility and fast analysis

Active Publication Date: 2019-11-26
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
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  • Application Information

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Problems solved by technology

However, the instruments used in these methods are expensive, the analysis process is slow, and the analysis time is long

Method used

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  • A method for detecting the concentration of benzoic acid by using a modified glassy carbon electrode
  • A method for detecting the concentration of benzoic acid by using a modified glassy carbon electrode

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Embodiment Construction

[0015] (1) Preparation of o-carboxybenzaldehyde ethylenediamine acetal Schiff base copper complex modified glassy carbon electrode

[0016] a. A glassy carbon electrode with a ø of 2 mm was polished to a mirror surface on suede with nano-alumina powders of 0.03 μm and 0.1 μm, ultrasonicated in distilled water for 20 min, washed with distilled water, and placed in an oven at 50 °C Dry for 5 min to obtain a pretreated bare glassy carbon electrode.

[0017] b. Dissolve the copper complex of o-carboxybenzaldehyde ethylenediamine Schiff base in N,N dimethylformamide (DMF) and make it 0.0075 mol L -1 solution, and then added tetrabutylammonium perchlorate (TBAP) as a supporting electrolyte to obtain an electrolyte.

[0018] c. Using cyclic voltammetry, using a three-electrode system, using the bare glassy carbon electrode pretreated in step (1) step a as the working electrode, the Ag / AgCl electrode as the reference electrode, and the platinum wire electrode as the auxiliary electro...

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Abstract

The invention discloses a method for detecting the concentration of benzoic acid by using a modified glassy carbon electrode. The glassy carbon electrode modified by o-carboxybenzaldehyde ethylenediamine acetal Schiff base copper complex was prepared by electrodeposition, and the concentration of benzoic acid was determined by cyclic voltammetry at 0.001-2 mmol·L ‑1 Oxidation peak current value within the concentration range, the oxidation peak current value and its concentration are 0.001~2 mmol L ‑1 There is a good linear relationship in the concentration range, and the linear regression equation is I p2 (mA)=0.0322C (mmol / L)+0.0098, the linear range is 0.001~2 mmol·L ‑1 , the correlation coefficient R 2 is 0.99644, and the detection limit is 0.27 μmol L ‑1 . The detection method of the invention has the advantages of simple operation, rapid analysis, high sensitivity, stable system and good reproducibility.

Description

technical field [0001] The invention belongs to the field of electroanalytical chemistry, in particular to a method for detecting the concentration of benzoic acid by using a modified glassy carbon electrode. Background technique [0002] Benzoic acid is an important acid-type food preservative, which can inhibit the growth of yeast, bacteria, fungus, mold, etc., and prevent food from spoiling. In the food industry, the dosage of benzoic acid is strictly regulated, the maximum dosage of concentrated fruit and vegetable juice is 2.0g / kg; the maximum dosage of jam (excluding canned food), fruit juice (taste) beverages, soy sauce, and vinegar is 1.0g / kg. g / kg; the maximum usage amount in fudge, wine, and fruit wine is 0.8g / kg; the maximum usage amount in low-salt pickles, sauces, and preserves is 0.5g / kg; the maximum usage amount in carbonated drinks is 0.2g / kg kg. If benzoic acid is used in excess, it will threaten the health of the human body. At present, the literature ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/48G01N27/30
Inventor 刘峥李海莹王浩黄何香
Owner GUILIN UNIVERSITY OF TECHNOLOGY