Method for constructing modified carbon paste electrode by hydrotalcite composite material as well as electrochemical determination method of super-trace heavy metal ions and application thereof

A technology of heavy metal ions and carbon paste electrodes, applied in the field of electrochemical analysis and detection, can solve the problems of unsatisfactory speed, precision, sensitivity and anti-interference of heavy metal ions, and inconvenient installation and use of measuring equipment, etc., to achieve simple structure and practicability Strong, easy-to-prepare effects

Inactive Publication Date: 2012-08-15
SHANGHAI UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

The speed, accuracy, sensitivity and anti-interference performance of the existing differential pulse stripping voltammetry for t

Method used

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  • Method for constructing modified carbon paste electrode by hydrotalcite composite material as well as electrochemical determination method of super-trace heavy metal ions and application thereof
  • Method for constructing modified carbon paste electrode by hydrotalcite composite material as well as electrochemical determination method of super-trace heavy metal ions and application thereof
  • Method for constructing modified carbon paste electrode by hydrotalcite composite material as well as electrochemical determination method of super-trace heavy metal ions and application thereof

Examples

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Embodiment 1

[0022] In this embodiment, a method for constructing a modified carbon paste electrode using a hydrotalcite composite intercalated with ethylenediaminetetraacetic acid comprises the following steps:

[0023] a. Modified carbon paste electrode shell preparation: Take a glass tube with an inner diameter of 4.5 mm and a length of 60 mm, smooth both ends on sandpaper, clean it ultrasonically, dry it, and set aside;

[0024] b. Preparation of modified carbon paste electrode materials: put spectroscopically pure graphite powder, hydrotalcite composite material intercalated with disodium edetate, and liquid paraffin in an agate mortar at a mass ratio of 1:0.2:0.5, and fully grind them into carbon paste;

[0025] c. Assembly of the modified carbon paste electrode: then put the carbon paste prepared in step b into the electrode casing obtained in step a, insert a copper rod as an electrical contact conductor, compact the modified carbon paste electrode material in the electrode casi...

Embodiment 2

[0029] A method for electrochemical determination of ultra-trace heavy metal ions utilizing the modified carbon paste electrode of embodiment one:

[0030] In this example, the determination of lead ions was taken as an example. The prepared modified carbon paste electrodes were placed in buffer solutions containing different concentrations of lead ions, and a three-electrode system was used. Differential pulse stripping voltammetry was used to investigate the electrochemical influencing factors. Under the optimized electrochemical conditions, the open circuit voltage was enriched for 5 minutes, the deposition potential of -1.0 V was applied under continuous stirring, and the electrodeposition time was 5 minutes. The stripping current measured by the modified carbon paste electrode was consistent with that of The logarithm of the lead ion concentration has a good linear relationship, and its linear concentration range is 2 ng L -1 ~33 μg L -1 . The linear equation is Ip(A)=3...

Embodiment 3

[0033] As the application of the electrochemical determination method of ultra-trace heavy metal ions in Embodiment 2, the ultra-trace heavy metal ions that can be specifically used for determination are any one or more of zinc ions, cadmium ions, lead ions and copper ions.

[0034] In this example, figure 2 It is the differential pulse stripping voltammogram of the modified carbon paste electrode constructed by using the hydrotalcite composite material intercalated with ethylenediaminetetraacetic acid in the embodiment of the present invention to realize the simultaneous determination of lead ions, copper ions and cadmium ions by controlling different stripping potential pairs. exist figure 2 , the concentration of immobilized copper ions and cadmium ions was 10 ng L -1 , from a to f correspond to lead ion concentrations of 2, 12, 33, 137, 331, 1367 ng L -1 . Experiments have shown that when the concentrations of copper ions and cadmium ions are fixed, figure 2 It refl...

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Abstract

The invention discloses a method for constructing a modified carbon paste electrode by a hydrotalcite composite material as well as an electrochemical determination method of super-trace heavy metal ions and application of the methods. The methods can accurately, rapidly and sensitively determine the super-trace heavy metal ions in a water sample and belong to the technical field of electrochemical analysis and detection. The heavy metal ions are captured and enriched by a complexation effect of ethylene diamine tetraacetic acid to the heavy ions, such as lead ions, copper ions, zinc ions and cadmium ions; the super-trace heavy metal ions in the water sample are detected by a differentiated pulse stripping voltammetry method; and the detection limit of the detected metal ions can be reduced to 2 nanograms/liter. The method disclosed by the invention has the advantages of simple electrode preparation method, high determination sensitivity, low detection limit and strong anti-interference capability, and can realize accurate determination of the heavy metal ions in the water sample.

Description

technical field [0001] The invention relates to a method for constructing a modified carbon paste electrode by using a hydrotalcite composite material and the application of an electrochemical determination method for ultra-trace heavy metal ions, and belongs to the technical field of electrochemical analysis and detection. Background technique [0002] Heavy metal ions widely exist in nature. As metal ions, they are easily enriched in biological tissues and organs in the form of ions, and some cannot be biodegraded, causing permanent damage to the human body and organs, especially to intelligence. Development has a very bad effect, which makes the determination of heavy metal ions particularly necessary. At present, the determination methods of heavy metal ions include inductively coupled plasma atomic emission spectrometry, graphite furnace atomic absorption method, inductively coupled plasma mass spectrometry and other instrument methods, as well as square wave voltammetr...

Claims

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Application Information

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IPC IPC(8): G01N27/30
Inventor 董俊萍房庆华周小娟徐甲强
Owner SHANGHAI UNIV
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