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Printed electrode and preparation method thereof, and method for detecting heavy metal ions in water

A technology of heavy metal ions and printed electrodes, which is used in measurement devices, electrochemical variables of materials, material analysis by electromagnetic means, etc., can solve the problems of large differences in measurement results, and it is difficult for reference electrodes to provide stable electrode potential, etc. achieve good repeatability

Inactive Publication Date: 2020-04-21
SHANGHAI YIDIAN SCI INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reference electrode of the printed electrode is a mixed material of silver and silver chloride overprinted on the substrate, while the solid reference electrode is plated with a layer of dense silver chloride on the silver wire, and the screen printing electrode is directly inserted in the substrate to be In the measurement solution, it is difficult for the reference electrode to provide a stable electrode potential, and the measurement results vary greatly between different electrodes.

Method used

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  • Printed electrode and preparation method thereof, and method for detecting heavy metal ions in water
  • Printed electrode and preparation method thereof, and method for detecting heavy metal ions in water
  • Printed electrode and preparation method thereof, and method for detecting heavy metal ions in water

Examples

Experimental program
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Effect test

Embodiment 1

[0023] A preparation method of a reusable gold-plated screen-printed electrode, the specific method comprising the steps of:

[0024] S101, modification of the disposable printed electrode reference electrode. Insert the disposable printed electrode into the electroplating solution containing chloride ions, use the reference electrode of the printed electrode as the anode, and the counter electrode of the printed electrode as the cathode, and apply a positive voltage of 2.2V for 60s;

[0025] S102, pickling the surface of the printed electrode working electrode. Connect the printed electrode processed in step S101 to the measuring device of the portable heavy metal meter, insert it into the nitric acid solution with a pH value of 2.0, and apply a voltage of 1.2v for 300s;

[0026] S103, rinse the printed electrode pickled in step S102 with deionized water, transfer it to a mixed solution of 0.042g / L chloroauric acid and 0.1mol / L hydrochloric acid, and apply a voltage of -0.3v...

Embodiment 2

[0030] A method for the detection of heavy metal copper ions in water using reusable gold-plated screen-printed electrodes. The specific method includes the following steps:

[0031] S201, connect the gold-plated screen-printed electrode prepared in Example 1 directly to the portable heavy metal meter measuring device, and insert 20ml of 10μg / L heavy metal copper ion standard solution, add 2ml of copper electrolyte, apply a voltage for a certain period of time, and stand still for 20s After scanning, stripping, and then applying a certain positive voltage to clean the surface of the working electrode. In this step, the applied enrichment potential is -0.80v; the applied enrichment potential time is 60s; the scanning dissolution range is -0.3v~0.5v; the applied cleaning potential is 0.6v; the applied cleaning potential time is 30s .

[0032] S202, after step S201 is completed, continuously add the standard twice in the same measuring cup, and reuse the electrode in step S201....

Embodiment 3

[0034] A method for detecting heavy metal arsenic ions in water by using a reusable gold-plated screen-printed electrode, the specific method comprising the following steps:

[0035] S301, connect the gold-plated screen printing electrode prepared in Example 1 into the measuring device of the portable heavy metal meter, insert 10ml of 10μg / L heavy metal arsenic ion standard solution, add 10ml of arsenic electrolyte and 0.2ml of reducing agent solution, and apply a certain Time voltage, after resting for 20s, scanning, stripping, and then applying a certain positive voltage to clean the surface of the working electrode. In this step, the applied enrichment potential is -0.5v; the applied enrichment potential time is 60s; the scanning dissolution range is -0.3v~0.3v; the applied cleaning potential is 0.6v; the applied cleaning potential time is 30s.

[0036] S302, after step S301 is finished, continuously add the standard twice in the same measuring cup, and reuse the electrode ...

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Abstract

Provided in the invention is a preparation method of a printed electrode. The method comprises the following steps: S10, inserting a disposable printed electrode into a reference electrode electroplating solution, and applying a first positive voltage for a preset first time length by taking a reference electrode of the printed electrode as an anode and a counter electrode of the printed electrodeas a cathode; S11, connecting the printed electrode into a heavy metal measuring unit, inserting the printed electrode into an acid solution at the same time, and applying a second positive voltage for a preset second duration; S12, washing the printed electrode with deionized water, transferring the printed electrode into a gold plating solution, and applying a third voltage for a preset third time length; and S13, washing the printed electrode with deionized water, drying the washed electrode in air, and placing the processed electrode in a black container to stabilize for a fourth time length.

Description

technical field [0001] The invention belongs to the technical field of detection of heavy metal ions, and in particular relates to a reusable gold-plated screen printing electrode, a preparation method and a method for detecting heavy metal ions in water using the same. Background technique [0002] At present, most of the portable heavy metal analyzers on the market for rapid detection of trace heavy metal ions use electrochemical stripping voltammetry. This type of instrument has the characteristics of small size and easy operation, which meets the needs of on-site testing for portable instruments and easy operation. [0003] This type of instrument detection system is mainly divided into two categories: one is a three-electrode system with a glassy carbon electrode as the working electrode. This system has high detection accuracy, but in actual detection and analysis, it is often Maintenance greatly prolongs the analysis time, and it is difficult to meet the requirements...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/48G01N27/30G01N27/38
CPCG01N27/48G01N27/301G01N27/308G01N27/38
Inventor 迟屹君
Owner SHANGHAI YIDIAN SCI INSTR
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