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Method and device for detecting low-concentration heavy metal ions

A low-concentration heavy metal and ion technology, applied in measurement devices, material analysis by electromagnetic means, instruments, etc., can solve the problems of difficulty in rapid detection, expensive instruments, time-consuming and labor-intensive, etc., and achieves easy automation, convenient operation, high performance The effect of the Sterling response

Active Publication Date: 2012-01-11
YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the detection methods of heavy metal ions mainly include atomic absorption spectrometry, atomic emission spectrometry, atomic fluorescence spectrometry, mass spectrometry, and ICP-MS, etc., but these methods are expensive, cumbersome, time-consuming and laborious, and it is difficult to achieve rapid detection

Method used

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  • Method and device for detecting low-concentration heavy metal ions
  • Method and device for detecting low-concentration heavy metal ions
  • Method and device for detecting low-concentration heavy metal ions

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Take the electrode test standard lead ion solution of the present invention as an example. The determination steps are as follows:

[0029] a. The working electrode 9, the external reference electrode 5 and the platinum electrode 6 are connected to the electrochemical workstation 7 through wires, and the electrochemical workstation 7 is connected to the computer 8; the working electrode 9 is composed of the internal reference electrode 4 inserted into the ion selective electrode 3; The selective electrode 3 contains the inner filling liquid 2, and the bottom of the ion selective electrode 3 is provided with a polymer sensitive membrane 1; the silver / silver chloride electrode is the internal reference electrode 4, and the platinum electrode 6 is the counter electrode. Activated in 0.1M sodium chloride solution for 12h (see figure 1 ).

[0030] b. Preparation of polymer sensitive membrane: Take 29.7 parts by weight of polyvinyl chloride, 59.3 parts of o-nitrophenyl octyl eth...

Embodiment 2

[0037] Take the determination of lead ions in water samples as an example. The determination steps are as follows:

[0038] a. Predict the lead ion concentration in the sample to be tested at 1 0-8 -10 -9 Within the M range.

[0039] b. According to the applied current value determined by the standard curve, determine the 10 -8 M and 10 -9 M lead ion solution potential value.

[0040] c. Suppose the concentration of the sample solution to be tested is 5×10 -9 M, according to the current value determined by the standard curve, measure the potential value of the sample, the measured potential value is 5×10 -9 The potential value of M is low, indicating that the concentration of the sample solution to be tested is lower than 5×10 -9 M; assume that the concentration of the sample solution to be tested is 2×10 -9 M, according to the current value determined by the standard curve, measure the potential value of the sample, and the measured potential value is 2×10 -9 The potential value of ...

Embodiment 3

[0042] Take the electrode of the present invention to test copper ions in water as an example. The determination steps are as follows:

[0043] a. The working electrode 9, the external reference electrode 5 and the platinum electrode 6 are connected to the electrochemical workstation 7 through wires, and the electrochemical workstation 7 is connected to the computer 8; the working electrode 9 is composed of the internal reference electrode 4 inserted into the ion selective electrode 3; The selective electrode 3 contains the inner filling liquid 2, and the bottom of the ion selective electrode 3 is provided with a polymer sensitive membrane 1; the silver / silver chloride electrode is the internal reference electrode 4, and the platinum electrode 6 is the counter electrode. Activated in 0.1M sodium chloride solution for 12h (see figure 1 ).

[0044] b. Preparation of polymer sensitive film: mix 43.5 parts by weight of polybutyl acrylate, 43.5 parts of dibutyl sebacate, 12 parts of E...

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Abstract

The invention relates to detection of heavy metal ions, in particular to a method and a device for detecting low-concentration heavy metal ions. The method comprises the following steps of: inserting an ion selective electrode into a solution containing ions to be detected at high concentration of 10<-2> to 10<-5>M and applying pulse current of -1*10<-4> to -1*10<2> mu A to ensure that two adjacent kinds of high-concentration solution to be detected can achieve a Nernst response, and adhering a polymer sensitive film to the bottom of the ion selective electrode; measuring the Nernst response of the solution containing the ions to be detected at the concentration of below a reference until the lowest detection limit of the ions is reached, wherein a potential value of the solution containing lower-concentration ions to be detected is used as the reference; drawing a standard curve according to the detected value and current and solution concentration values; and measuring the solution containing the ions to be detected at the unknown concentration by a gradually approaching method, and acquiring the concentration of a solution sample according to the applied current, the acquired potential value and the standard curve. By the method and the device, the detection limit of the ion selective electrode is obviously reduced, and the sensitivity of the electrode is improved.

Description

Technical field [0001] The invention relates to the detection of heavy metal ions, in particular to a method and device for detecting low-concentration heavy metal ions. Background technique [0002] With the rapid development of industry, more and more heavy metal ions are discharged into rivers and eventually flow into the ocean, causing increasingly serious pollution problems. Polluted seawater will not only endanger the microorganisms in the seawater, destroy the ecological environment, but also endanger human health. Therefore, the detection of heavy metal ions in the seawater is very necessary. At present, the detection methods of heavy metal ions mainly include atomic absorption spectrometry, atomic emission spectrometry, atomic fluorescence spectrometry, mass spectrometry, and ICP-MS. However, these methods are expensive, bulky, time-consuming and labor-intensive, and it is difficult to achieve rapid on-site detection. . Summary of the invention [0003] The purpose of t...

Claims

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Application Information

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IPC IPC(8): G01N27/416G01N27/333
Inventor 秦伟付秀丽
Owner YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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