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Method and device for detecting metal ions by adopting liquid dielectric barrier discharge (DBD) emission spectrum

A technology of emission spectroscopy and metal ions, applied in the field of analytical chemical spectroscopy, can solve the problems of large amount and complexity of liquid samples, and achieve the effect of easy implementation, small size and low cost

Inactive Publication Date: 2012-05-09
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These discharge systems have the advantages of small size, simple operation, good selectivity, high sensitivity, low cost, etc., but they still inevitably need to use complicated devices and sampling systems, and the amount of liquid samples is large.

Method used

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  • Method and device for detecting metal ions by adopting liquid dielectric barrier discharge (DBD) emission spectrum
  • Method and device for detecting metal ions by adopting liquid dielectric barrier discharge (DBD) emission spectrum
  • Method and device for detecting metal ions by adopting liquid dielectric barrier discharge (DBD) emission spectrum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1: The structure of the device for detecting metal ions in water by liquid discharge emission spectrum of the present invention is as follows figure 1 As shown, the power supply 1 adopts the AC power supply of the ozone generator, the discharge power is selected to be 1-100W, and the frequency is 50Hz-50MHz; the diameter of the metal electrode wire or rod electrode 2 is 0.1-2mm, and the material can be platinum, tungsten or titanium or an alloy. The metal plate electrode 5 can be aluminum foil paper, tin foil paper or copper sheet; the material of the dielectric plate 6 can be glass sheet, ceramic sheet, mica sheet, and the thickness is 0.2 ~ 2mm; the metal ion sample solution for detection is nitric acid, hydrochloric acid or sulfuric acid The water body and biological sample solution diluted by one or its mixture, the pH is 0-3.

[0030] The discharge is generated between the wire or rod electrode 2 and the metal ion sample solution 4, and the distance betw...

Embodiment 2

[0033] Embodiment 2: Using the device with the same structure as in Embodiment 1 combined with the method of the present invention to conduct a further description of the effect of liquid dielectric barrier discharge emission spectroscopy detection of metal element content analysis on the actual sample to be tested.

[0034] This method detects as follows:

[0035]First prepare a set of liquid discharge emission spectrum detection device for metal ions in water with the same structure as in Example 1: select a tungsten rod with a diameter of 2.0 mm as the electrode 2, select a glass sheet with a thickness of 2 mm as the dielectric plate 6, and select aluminum foil As a metal plate electrode 5;

[0036] Metal ion sample solution 4 selects industrial wastewater as the detection object, dilutes a small amount of industrial wastewater with nitric acid, makes pH=0, and drops it on different positions on the medium plate 6 respectively to measure; the power supply selects the power ...

Embodiment 3

[0037] Embodiment 3: A titanium wire with a diameter of 0.2 mm is selected as an electrode, a mica sheet is selected as a dielectric plate material with a thickness of 1.0 mm, and tin foil is used as another electrode. The power supply power is 30W, and the frequency is 10 kHz. The discharge distance is controlled to be 1.5mm. Select blood as the detection object, dilute the blood with sulfuric acid, pH=1; select the object distance greater than twice the focal length of the lens, and use a spectrometer to measure the content of Ca, Zn, Fe, Pb and other metal elements in the sample solution. The detection method steps are the same as Example 2.

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Abstract

The invention relates to a method and device for detecting metal ions by adopting a liquid dielectric barrier discharge (DBD) emission spectrum. In the device, a metal wire or stick and a metal flat plate are taken as two electrodes respectively; a dielectric slab is inserted into the space between the two electrodes, and is covered on the surface of the metal flat plate electrode; the dielectricslab and the metal flat plate are arranged on an adjustable-position three-dimensional platform; and a lens is arranged between a discharge region and a spectrometer, and is used for introducing spectrum lines emitted by the discharge region into the spectrometer. Discharge is generated between the metal wire or stick and a sample solution, so that metal ions dissolved into the solution enter plasmas and are excited to generate an emission spectrum. In the method, a complex feeding system is eliminated, the advantages of liquid discharge and DBD are combined, and only a small amount of samplesolution is needed for determining. The device has the advantages of simple structure, small size, convenience for installing and low cost. The method is easy to implement, and can be used for realizing real-time online detection of the metal ion content of a water body and a biological sample under the atmospheric pressure.

Description

technical field [0001] The present invention relates to a method and device for detecting metal ions by emission spectrum of liquid dielectric barrier discharge, in particular to a device for detecting metal ions in water bodies and biological samples by emission spectrum of liquid dielectric barrier discharge (DBD) driven by alternating current under atmospheric pressure The invention relates to a method for detecting metal ions by using the device, and belongs to the field of analytical chemical spectral analysis. Background technique [0002] Traditional metal ion detection methods include inductively coupled plasma spectroscopy, mass spectrometry, and flame atomic absorption spectroscopy. In recent years, the method of using liquid electrode discharge spectroscopy to detect metal elements in water has attracted more and more attention. Among them, the potential of electrolyte cathodic atmospheric pressure glow discharge-atomic emission spectroscopy (ELCAD-AES) in practi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/67G01N21/69
CPCG01N21/67G01N21/69
Inventor 朱振利何倩郑洪涛黄瑞敏胡圣虹
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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