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A preparation method of an electrochemical sensor for detecting heavy metal residues

An electrochemical and sensor technology, which is applied in the field of preparation of modified carbon paste electrodes based on Schiff base-coated ferric oxide nanoparticles, and achieves the effects of high electrical conductivity, fast response, and good chemical and thermal stability.

Active Publication Date: 2016-09-28
广西合天宝龙食品有限公司
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Problems solved by technology

[0005] However, among the electrochemical sensors based on different electrodes used for the trace detection of heavy metal ions in the prior art, there is no cheap, time-saving, high detection sensitivity, high heavy metal selectivity, and can simultaneously detect cadmium, copper and Electrochemical sensors for mercury

Method used

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Embodiment Construction

[0018] In order to deepen the understanding of the present invention, the present invention will be further described below in conjunction with implementation.

[0019] A preparation method of an electrochemical sensor for simultaneously detecting cadmium, copper and mercury heavy metal ions in water and food, the steps are as follows:

[0020] (1) Synthesis of Schiff base complex: 1mmol (0.186g) piperazine is dissolved in 200mL methanol to form a solution, and then added dropwise under stirring Base benzaldehyde in hot 100mL methanol solution, the mixed solution was stirred and heated to reflux for 4h, the yellow precipitate was filtered off, washed with cold methanol, and then vacuum-dried to obtain the Schiff base complex.

[0021] (2) Preparation and coating of ferroferric oxide nanoparticles: iron ferric oxide nanoparticles with Fe 2+ and Fe 3+ Prepared by solution co-precipitation method, 0.2g Schiff base complex was dissolved in 25mL methanol, then mixed with 0.2g fer...

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Abstract

The invention relates to a preparation method of an electrochemical sensor for detecting heavy metal residues. The present invention embeds the synthesized Fe3O4 nanoparticles coated with Schiff base complexes on the carbon paste electrode, thereby preparing a new type of modified electrode, and the electrochemical sensor constructed with the electrode is used for Trace detection of heavy metals such as cadmium, copper and mercury. Ferroferric oxide nanoparticles have characteristics such as good chemical thermodynamic stability, electrocatalytic activity, large specific surface area and high conductivity, and the macrocyclic Schiff base has excellent detection selectivity, so that the two are sensitive to the electrochemical reaction involved in the present invention. The sensor produces a significant modification effect. The electrochemical sensor involved in the invention provides a simple, fast, sensitive and highly selective method for the simultaneous detection of cadmium, copper and mercury in water and food.

Description

technical field [0001] The invention relates to a preparation method of an electrochemical sensor, in particular to a modified carbon paste based on Schiff's base coating ferric oxide nanoparticles which can be used to simultaneously detect heavy metal ions such as cadmium, copper and mercury in water and food Electrode preparation method. Background technique [0002] Inorganic ion pollutants have an important impact on human health and the natural environment, and heavy metal ions have toxic effects on flora and fauna in the food chain, including humans. In recent years, people pay more and more attention to food quality and safety, so the detection of toxic elements in food is more important. There are many methods for detecting heavy metal ions in samples. The methods usually used to detect heavy metal ions at different concentrations include atomic absorption spectroscopy (AAS), ion-coupled optical emission spectroscopy (ICP-OES), ion-coupled mass spectrometry (ICP-MS)...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/30
Inventor 孙京华潘正海
Owner 广西合天宝龙食品有限公司
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