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Electrochemical sensor for determining concentration of heavy metal ions in water sample

A heavy metal ion, electrochemical technology, applied in the field of sensors, can solve problems such as application limitations, achieve high selectivity measurement, improve stability, and avoid interference effects

Active Publication Date: 2010-05-12
YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although they have good selectivity for specific ions, their use in voltammetric analysis is limited due to the fact that ionophores themselves are mostly non-conductive organic molecules

Method used

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  • Electrochemical sensor for determining concentration of heavy metal ions in water sample
  • Electrochemical sensor for determining concentration of heavy metal ions in water sample
  • Electrochemical sensor for determining concentration of heavy metal ions in water sample

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Such as figure 1 with 2 The sensor shown: the working electrode 1, the reference electrode 3 and the auxiliary electrode 2 are respectively connected to the control potentiometer 4 by wire traction; the working electrode 1 is composed of a polytetrafluoroethylene tube 7 and a carbon electrode 5 sandwiched therein, and the carbon electrode The bottom end of 5 is led out by the lead wire 6, and the top end is decorated with a sensitive film 8; the platinum plate electrode is used as an auxiliary electrode, and the saturated calomel electrode is used as a reference electrode, and the current response value is determined by controlling the potentiometer.

[0020] The preparation of the sensitive membrane is as follows: adding 1 mmol of nano-hydroxyapatite, 0.5% cation exchanger Nafion (US sigma-aldrich company) and 0.5 mmol of lead ionophore in every liter of N, N dimethylformamide solution 4-tert-butylcalix[4]arene-tetrakis(N,N-dimethylethanesulfonamide) (Fluka, USA), and...

Embodiment 2

[0024] The difference from Example 1 is:

[0025] The preparation of the sensitive membrane is as follows: adding 1 mmol of nano-hydroxyapatite, 0.5% cation exchange polymer Nafion (US sigma-aldrich company) and 0.5 mmol of lead ion in every liter of N, N dimethylformamide solution Carrier 4-tert-butylcalix[4]arene-tetrakis(N,N-dimethylethanesulfonamide) (Fluka, USA), and then ultrasonically dispersed until a uniform dispersion was obtained, and 1 μL of the dispersion was uniformly coated on On the surface of the carbon electrode, the solvent was evaporated at 10°C for 10 minutes to obtain a sensitive film.

[0026] Adopt the electrode of the present invention to measure the lead ion concentration in the water sample in the presence of the interfering ions of each liter of lead ion 0.5 μ mol solution and per liter of the mixed solution of each 0.5 μ mol concentration of lead ions, copper ions, cadmium ions and mercury ions (see Figure 4 ). In the figure on the right, it can...

Embodiment 3

[0028] Sensitive film is to add 20mmol nanometer functional adsorption material, 5% Nafion by mass ratio and 10mmol copper ionophore to every liter of tetrahydrofuran solution and mix well, then take 30μL and evenly coat on the surface of carbon electrode. When preparing the sensitive film, the nano-functional adsorption material, Nafion and lead-containing ion carrier are uniformly dispersed by ultrasonic; and evaporated at 50° C. for 60 minutes after being coated on the surface of the carbon electrode. The ionophore is N, N, N', N'-tetracyclohexane-2,2'-thiodiacetylamine (Fluka, USA); the nano-functional adsorption material is nano-titanium dioxide.

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Abstract

The invention relates to a sensor, in particular to an electrochemical sensor for determining the concentration of heavy metal ions in a water sample. The electrochemical sensor specifically comprises a working electrode, a reference electrode and an auxiliary electrode, and the working electrode, the reference electrode and the auxiliary electrode are respectively connected to a control potential meter through conducting wires; the working electrode consists of a polytetrafluoroethylene pipe and a carbon electrode clamped therein, the bottom end of the carbon electrode is connected with a lead wire for leading out, and a sensitive membrane is arranged at the top end of the carbon electrode; and the sensitive membrane consists of a nano-functional absorbing material, a heavy metal ion carrier and an ion exchange agent, 1-20mmol of nano-functional absorbing material, 0.5%-5% by weight of the ion exchange agent and the 0.5-10mmol of the ion carrier are added in each liter of dispersant and evenly mixed, and then 1mu L-30mu L of the mixture is taken and evenly coated on the surface of the carbon electrode. The electrochemical sensor has low cost, simple technology, high selectivity and sensitivity and good stability, and can be extensively applied in the detection of the heavy metal ions in waste water, fresh water, sea water, daily necessities and body fluid.

Description

technical field [0001] The invention relates to a sensor, in particular to an electrochemical sensor for measuring the concentration of heavy metal ions in water samples. Background technique [0002] With the rapid development of modern industry and transportation, environmental heavy metal pollution is becoming more and more serious, which has become an important social problem affecting human health and public safety. Heavy metal elements can accumulate in the human body, which can cause anemia, neurological dysfunction or kidney damage and other hazards. As people become more and more aware of the hazards of heavy metals, all countries have adopted various measures to reduce the pollution of heavy metals. Accurate, rapid and effective determination of heavy metal content has become an important content in the research of analytical methods in recent years. [0003] At present, the main methods for determining the content of heavy metals in water samples are atomic absor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/416
Inventor 潘大为秦伟王元娥娄婷婷
Owner YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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