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Method for determining copper ions by selenium film modified electrode

A technology for modifying electrodes and copper ions, applied in the direction of material electrochemical variables, etc., can solve the problems of low sensitivity of anodic dissolution method, affecting analytical performance, application limitations, etc., to improve reproducibility and accuracy, improve sensitivity, detect low limit effect

Active Publication Date: 2010-02-17
SHAOXING MAIBAO TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the toxicity and environmental hazards of mercury and mercury film electrodes, its application is greatly limited. At the same time, copper is easily interfered by organic substances, surfactants, metal mercury and zinc on mercury electrodes, which affects its analytical performance. [Applicationof potentiometric stripping analysis for speciation of copper complexes withadsorbable ligands on the mercury electrode.Analytica Chimica Acta,1995,314(5):241-249;Application of adsorptive cathodic differential pulse stripping methodfor simultaneous determination of copper and molybdenum using pyrogallol red. Analytica Chimica Acta, 2004, 505(10): 201-207]
However, the sensitivity of the anodic dissolution method on carbon paste and gold electrodes is not high, and the reproducibility is poor, which also brings trouble to the analysis [Determination of copper by zeolitemolecular sieve modified electrode. Electrochimica Acta, 1997, 42 (4): 595 -604; Electrochemical behavior of thioglycolic acid modified gold electrode and determination of copper ions. Chemical Research, 2006, 17(2): 80-83]

Method used

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  • Method for determining copper ions by selenium film modified electrode
  • Method for determining copper ions by selenium film modified electrode
  • Method for determining copper ions by selenium film modified electrode

Examples

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Embodiment 1

[0021] This embodiment adopts Potentiostat / Galvanostat BAS-100A chronopotential analyzer and electrochemical three-electrode test system, uses pyrolytic graphite (EPPG) as the electrode substrate, reduces the selenium film formed by co-enrichment as the working electrode, and platinum wire as the counter electrode , Ag / AgCl is the reference electrode, and the copper ion content in the sample is tested by anodic stripping differential chronopotential method. Reduction co-enrichment and anodic stripping conditions are respectively: the enrichment potential is -200mV, the enrichment time is 180s, and the resting time is 20s; during the test, the anodic stripping current is +2.0μA, and the scan rate is 20mV s -1 , the frequency is 20Hz.

[0022] See attached figure 1 , curve 1 in the figure is for 0.01molL by the above method -1 HCl+5.0gL -1 The results obtained from the KCl solution test; Curve 2 is the addition of 20.0 μgL to the solution described in Curve 1 -1 After Cu(II)...

Embodiment 2

[0026] This embodiment adopts Potentiostat / Galvanostat BAS-100A chronopotential analyzer and electrochemical three-electrode test system, uses pyrolytic graphite (EPPG) as the electrode substrate, reduces the selenium film formed by co-enrichment as the working electrode, and platinum wire as the counter electrode , Ag / AgCl as the reference electrode, using anodic stripping differential chronopotentiometry to measure different concentrations of copper ions in simulated water samples; at the same time, 1.0 μg L -1Cu(II) for the anti-interference detection of different ions. Reduction co-enrichment and anodic stripping conditions are respectively: the enrichment potential is -300mV, the enrichment time is 180s, and the resting time is 20s; during the test, the anodic stripping current is +2.0μA, and the scan rate is 20mV s -1 , the frequency is 20Hz.

[0027] See attached figure 2 And attached image 3 , for containing 0.01mol L -1 HCl, 10.0gL -1 KCl, 1.0 mg L -1 Cu(II) o...

Embodiment 3

[0032] This embodiment adopts Potentiostat / Galvanostat BAS-100A chronopotential analyzer and electrochemical three-electrode test system, uses pyrolytic graphite (EPPG) as the electrode substrate, reduces the selenium film formed by co-enrichment as the working electrode, and platinum wire as the counter electrode , Ag / AgCl as the reference electrode, using the anodic stripping differential chronopotential method to determine the copper ion content of simulated water samples, spiked seawater and tap water samples. Reduction co-enrichment and anodic stripping conditions are respectively: the enrichment potential is -300mV, the enrichment time is 180s, and the resting time is 20s; during the test, the anodic stripping current is +2.0μA, and the scan rate is 20mV s -1 , the frequency is 20Hz.

[0033] Simulation sample: adopt the test method of embodiment 1 or 2, be 0.40 μ g L to known Cu (II) concentration -1 The simulated sample 1, the known Cu(II) concentration is 3.0μg L -1...

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Abstract

The invention relates to a method for determining copper ions by a selenium film modified electrode, which adopts an electrochemical three-electrode testing system and an anodic stripping differentialtiming potentiometric method for determination. Thermal cracking graphite is used as an electrode substrate, a selenium film formed by reducing and enriching Na2SeO3 and Cu (II) in an acidizing medium of dilute hydrochloric acid is used as a working electrode, a selenide of copper Cu2Se is reduced and enriched on the working electrode, a differential curve of dT / dE-E is obtained by recording thevariation function of the potential E along with the testing time T on the working electrode and carrying out differential processing, and the content of Cu (II) can be calculated by the height of the characteristic response peak on the differential curve. The method of the invention overcomes the defects of environmental hazards, hypertoxicity and the like of the traditional mercury electrode, has the advantages of high testing sensitivity, strong anti-interference property, good environmental protection, low cost, short processes, convenient operation and high efficiency, and can be used for the analysis and determination of micro or trace amount of copper ions in natural water.

Description

1. Technical field [0001] The invention relates to a method for analyzing and measuring inorganic ions, in particular to an electrochemical analysis method for copper ions, in particular to a method for measuring copper ions with a selenium film modified electrode. 2. Background technology [0002] Copper is an important natural metal element that is widely distributed and exists in the natural environment. It is widely used in the metallurgical industry, textile pigments, composite material production, ceramics, semiconductors, batteries, cables, etc., and even in industrial fields such as medicine[Removal of copper(II)ions from aqueous solution by biosorption onto agricultural waste sugar beet pulp. Process Biochemistry, 2005, 40(2): 3031-3044; medical application of copper ions. Chinese Journal of Medical Research, 2006, 6(4): 382- 383]. Due to rock weathering, soil erosion, etc. in nature and human production activities, especially chemical industry, printing and dyeing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/42G01N27/30
Inventor 许云辉刘新
Owner SHAOXING MAIBAO TECH CO LTD
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