Membrane electrode and preparation method thereof, sensor comprising membrane electrode, electrochemical workstation and application thereof

Abstract

The invention provides a membrane electrode and a preparation method thereof, a sensor by employing a membrane electrode, an electrochemical workstation and application thereof. The membrane electrodecomprises an electrode and a modified membrane on the surface of the electrode, the modified membrane is a mixture of chitosan and alizarin red S; the modified membrane of the chitosan and the alizarin red S is deposited at the surface of the electrode to allow the obtained membrane electrode to have high sensitivity, high sensing effect and have responsiveness to the current change; the preparation method of the membrane electrode is simple, easy to obtain raw materials, low in cost and easy to implement and can be suitable for industrial large-scale production application; and the sensor comprising the membrane electrode is high in detection sensitivity and good in accuracy; the electrochemical workstation comprising the sensor can achieve the qualitative and quantitative detection of aluminum ions, and is high in sensitivity, small in relative standard deviation and high in accuracy.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and relates to a membrane electrode, a preparation method thereof, a sensor using the membrane electrode, an electrochemical workstation and applications thereof. Background technique [0002] Aluminum is a non-essential metal element that can be ingested and accumulated in the human body through food. Higher concentrations of aluminum have greater harm to various tissues, organs, nervous system and bones of the human body. There are two main sources of aluminum in the food production process: 1. The leavening agents used in the production of traditional fried dough sticks or pasta, such as ammonium alum (ammonium aluminum sulfate) and potassium alum (potassium aluminum sulfate); 2. aquatic products (such as jellyfish) dehydrating agent used in dehydration treatment, such as potassium alum (potassium aluminum sulfate). Although the limit requirements for aluminum in food are not very strict, uns...

AI Technical Summary

Problems solved by technology

The detection results of the above methods are accurate, but they all require a sufficient amount of samples, resulting in a long time for sample digestion and high reagent consumption, which is not suitable for the needs of rapid detection.

On the other hand, although the simple colorimetric method can be used for rapid detection of aluminum, it can only be used for qualitative analysis, and it is difficult to quickly determine the content of aluminum.

[0004] CN103424456A discloses an ampere-type three-electrode electrochemical sensor for detecting toxic gas ammonia or amines in gas; the invention provides a three-electrode electrochemical sensor comprising a working electrode, a reference electrode and a For the counter electrode, all three electrodes are in contact with the liquid-phase electrolyte and form ion conduction through the electrolyte. The working electrode is composed of a porous electronic conductor layer, and the electronic conductor layer contains active materials. The active material A combination of one or more selected from manganese compounds, cobalt compounds or chromium compounds; the sensor described in this invention has high activity and service life, but it is not mentioned that it can be used for the detection of aluminum ions

[0005] CN108982638A discloses a method for quickly measuring trace aluminum in water, which relates to the technical field of element detection; a method for rapidly measuring trace aluminum in water, which includes: using an electrochemical method to measure Al 3+ concentration, wherein the working electrode is a carbon paste electrode, and the buffer solution includes at least one of phosphoric acid, acetic acid and boric acid; and chrome black T is used as the electrochemical probe for measurement; the method has high sensitivity and is less disturbed. but does not mention its accuracy

[0006] CN104020123A discloses a nitrous oxide-acetylene flame atomic absorption detection method for aluminum in jellyfish, comprising the following steps: (1) selecting a jellyfish sample to be tested, and using a digestion solution to digest the jellyfish sample solution to be tested; (2) preparing aluminum Element standard solution; (3) adopt the flame atomic absorption instrument that has nitrous oxide-acetylene combustion head to analyze the jellyfish sample solution to be measured in step (1) and the aluminum element standard solution in step (2), with The aluminum element standard solution makes a standard curve, quantifies the aluminum element in the jellyfish sample solution to be tested, and obtains the content of aluminum element in the jellyfish sample solution to be tested; this method can detect the high content of aluminum element in jellyfish, with small error and accuracy High precision, but need to use expensive equipment, the cost is higher

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