Electrochemical method for detecting trace trivalent inorganic arsenic by using mercaptoethylamine modified electrode

A mercaptoethylamine and modified electrode technology, applied in the field of electrochemical detection, can solve the problems of complex electrochemical methods, poor anti-interference ability, long detection time, etc., to avoid electrochemical polarization process, strong anti-interference ability, The effect of short detection time

Inactive Publication Date: 2012-07-18
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of complex process, long detection time, poor reproducibility and poor anti-interference ability of the existing electro

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  • Electrochemical method for detecting trace trivalent inorganic arsenic by using mercaptoethylamine modified electrode
  • Electrochemical method for detecting trace trivalent inorganic arsenic by using mercaptoethylamine modified electrode
  • Electrochemical method for detecting trace trivalent inorganic arsenic by using mercaptoethylamine modified electrode

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Experimental program
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Embodiment 1

[0032] Step 1: Using as figure 1 In the three-electrode electrochemical system shown, the gold electrodes were polished to a "mirror surface" with suede with 1.0 μm and 0.3 μm alumina suspensions respectively, and were cleaned by ethanol and secondary water ultrasonically before use;

[0033] Step 2: Put the treated gold electrode obtained in step 1 into 10mM mercaptoethylamine solution, soak for 1 hour, fix mercaptoethylamine on the surface of the gold electrode through the action of Au-S bond, and then wash the electrode with secondary water Rinse to obtain a gold electrode modified with mercaptoethylamine;

[0034] Step 3: Put a magnetic stirrer 2 in the electrochemical detection cell 8, place it on the magnetic stirrer 1, use the gold electrode modified with mercaptoethylamine obtained in step 2 as the working electrode 3, and silver-silver chloride as the reference For the counter electrode 4, platinum is co-inserted for the counter electrode 5 respectively containing 0....

Embodiment 2

[0039] Step 1: Using as figure 1 In the three-electrode electrochemical system shown, the gold electrodes were polished to a "mirror surface" with suede with 1.0 μm and 0.3 μm alumina suspensions respectively, and were cleaned by ethanol and secondary water ultrasonically before use;

[0040] Step 2: Put the treated gold electrode obtained in step 1 into 10mM mercaptoethylamine solution, soak for 1 hour, fix mercaptoethylamine on the surface of the gold electrode through the action of Au-S bond, and then wash the electrode with secondary water Rinse to obtain a gold electrode modified with mercaptoethylamine;

[0041] Step 3: Put a magnetic stirrer 2 in the electrochemical detection cell 8, place it on the magnetic stirrer 1, use the gold electrode modified with mercaptoethylamine obtained in step 2 as the working electrode 3, and silver-silver chloride as the reference Compared to electrode 4, platinum is co-inserted for counter electrode 5 containing 100 μgL -1 In the elec...

Embodiment 3

[0049] Step 1: Using as figure 1 In the three-electrode electrochemical system shown, the gold electrodes were polished to a "mirror surface" with suede with 1.0 μm and 0.3 μm alumina suspensions respectively, and were cleaned by ethanol and secondary water ultrasonically before use;

[0050] Step 2: Put the treated gold electrode obtained in step 1 into 10mM mercaptoethylamine solution, soak for 1 hour, fix mercaptoethylamine on the surface of the gold electrode through the action of Au-S bond, and then wash the electrode with secondary water Rinse to obtain a gold electrode modified with mercaptoethylamine;

[0051] Step 3: Put a magnetic stirrer 2 in the electrochemical detection cell 8, place it on the magnetic stirrer 1, use the gold electrode modified with mercaptoethylamine obtained in step 2 as the working electrode 3, and silver-silver chloride as the reference Add 50 μgL of platinum for the common insertion of the counter electrode 4 and the counter electrode 5 -1 ...

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Abstract

The invention discloses an electrochemical method for detecting trace trivalent inorganic arsenic by using a mercaptoethylamine modified electrode, and relates to the field of electrochemical detection. The method solves the problems of complex process, long detection time, poor reproducibility and poor interference resistance of the conventional electrochemical methods for detecting the trivalent arsenic. According to the method, the mercaptoethylamine modified gold electrode serving as a working electrode, silver-silver chloride serving as a reference electrode and platinum serving as a counter electrode form a three-electrode system; and constant potential deposition is performed by applying a voltage through differential pulse voltammetry, dissolved oxidation reaction of arsenic is performed on the surface of the mercaptoethylamine modified gold electrode, and the trivalent arsenic is detected in a phosphate buffer solution. The electrode preparation method is simple, an electrochemical polarization process under high potential is avoided, the sensitivity and the reproducibility of the sensing detection are improved, and the problem of interference of copper ions is solved; and the detection time is short, the detection limit can reach 0.02mugL<-1>, and the method can be used for detecting the arsenic in a practical sample.

Description

technical field [0001] The invention relates to the field of electrochemical detection, in particular to an electrochemical method for detecting trace amounts of trivalent inorganic arsenic using a mercaptoethylamine-modified electrode. Background technique [0002] Water pollution is one of the main environmental pollution. The heavy metals referred to in environmental pollution mainly refer to mercury, cadmium, lead, chromium, thallium and heavy metal arsenic with significant biological toxicity. Heavy metals in the environment can be enriched in organisms through the food chain. Multiple systems of the body cause damage. The toxicity of elemental arsenic is extremely low, while arsenic compounds are highly toxic. Trivalent arsenic compounds are more toxic than other arsenic compounds. If the intake exceeds the excretion, it will be in the liver Arsenic, kidney, lung, spleen, uterus and other parts accumulate, combine with the enzyme system in the cell, inhibit the biologi...

Claims

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Application Information

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IPC IPC(8): G01N27/48G01N27/30
Inventor 李冬月李敬贾小芳韩彦超夏勇
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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