Metal element liquid phase cathode discharge plasma spectrum rapid detection system and detection method thereof

A discharge plasma, plasma technology, applied in the direction of electrical excitation analysis, material excitation analysis, etc., to achieve the effect of reducing absorption, avoiding loss, and reducing loss

Inactive Publication Date: 2015-12-02
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Metal element liquid phase cathode discharge plasma spectrum rapid detection system and detection method thereof
  • Metal element liquid phase cathode discharge plasma spectrum rapid detection system and detection method thereof
  • Metal element liquid phase cathode discharge plasma spectrum rapid detection system and detection method thereof

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Embodiment 1

[0034] With the camera head of ICCD camera 21 towards plasma generator 1, camera head is flush with fiber optic probe 12, and camera head and fiber optic probe 12 are on 180 ° direction; Condenser lens 22 is placed on ICCD camera 21 and plasma generator 1; the distance between the graphite carbon rod 5 and the needle-shaped platinum electrode cathode 16 is adjusted to be 1cm by the translation stage 6; the HNO of 150mL pH=1 3 The solution is injected into the plasma generating device 1, so that the lower end of the graphite carbon rod 5 and the needle-shaped platinum wire 23 are all in the liquid to be detected, and the cooling water inlet 19 and the cooling water outlet 10 are respectively communicated with the cooling water supply device; The piezoelectric source 2 and the cooling water supply device, when the voltage rises to 290V, the needle-shaped platinum wire discharges, generating glow plasma, forming a stable discharge area in the liquid to be detected, and generating ...

Embodiment 2

[0037] The nitric acid preparation concentration of pH=1 is respectively the solution of 5mg / L, 10mg / L, 15mg / L, 20mg / L and 30mg / L, measures respectively by the method for embodiment 1, obtains as follows Figure 5 The atomic emission spectrograms of Cd at different concentrations are shown, and the spectral line of Cd is at the wavelength of 228.80nm. Depend on Figure 5 It can be seen that as the concentration of the liquid to be tested increases, the signal intensity of the spectrum increases sequentially. Taking the intensity as the ordinate and the element content as the abscissa, the quantitative relationship between the spectral line intensity and the element content is obtained, and linear fitting is carried out according to this relationship, so that the linear range of the concentration of the measured substance can be determined. The limit of detection (LOD) of metal elements can be calculated by the following formula:

[0038] LOD= kσ / S

[0039] In the formu...

Embodiment 3

[0041] Prepare a mixed standard stock solution of copper and lead ions with a concentration of 1000mg / L with nitric acid at pH=1. During the measurement, it was diluted step by step into a series of solutions with concentrations of 1mg / L, 2mg / L, 3mg / L, 4mg / L, 5mg / L, 6mg / L, 7mg / L, and 8mg / L. The solution of each concentration in the series solution prepared is measured according to the method of embodiment 1 respectively, obtains Figure 6 The liquid-phase cathode glow discharge atomic emission spectrogram of the mixed solution copper ions shown and Figure 7 The shown liquid-phase cathode glow discharge atomic emission spectrogram of lead ions, the wavelength 324.75nm and the wavelength 405.78nm are copper wire and lead wire respectively. Depend on Figure 6 and Figure 7 It can be seen that as the concentration of the solution to be tested increases, the signal intensity of the spectrum increases sequentially. Figure 8 is the typical curve of the copper ion measured by t...

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Abstract

The invention relates to a metal element liquid phase cathode discharge plasma spectrum rapid detection system and a detection method thereof. The system comprises a plasma generation device, a fiber spectrometer and an ICCD camera. A needlelike platinum electrode cathode is arranged in the plasma generation device, the top of the plasma generation device is provided with an anode, the sidewall of the plasma generation device is provided with a fiber probe, and the needlelike platinum electrode cathode is respectively connected with a power supply negative electrode and an oscilloscope through two resistors; a graphite carbon rod is connected with a translation bench, a power supply positive electrode and a third resistor connected with the oscilloscope; and a condensing lens is arranged in front of the ICCD camera, and the fiber spectrometer and the ICCD camera are connected with a computer. In the detection process, voltage and current are increased, the needlelike platinum electrode cathode discharges to generate glow plasma, and the oscilloscope determines the current-voltage waveform; and the computer analyzes an optical signal to complete qualitative or quantitative detection of a metal element. The detection system uses no peristaltic pump, so loss caused by flow introduction of a sample in the determination process is avoided, and analysis detection of a trace quantity of the metal element in an environment sample is convenient.

Description

technical field [0001] The invention belongs to the technical field of atomic emission spectrum analysis in analytical chemistry, and relates to a plasma excitation spectrum detection system composed of a liquid-phase cathode glow discharge generating device, which is used for real-time, on-line and multi-element rapid qualitative and quantitative detection in solution at the same time The metal element; the present invention also relates to a method for rapidly determining the metal element in the solution by using the detection system. Background technique [0002] Water is one of the essential substances for human survival and development. However, due to human activities and the development of industry and agriculture, a large amount of wastewater containing heavy metal ions is produced. Heavy metal ions can be enriched in organisms through the food chain, and endanger human health through the food chain, posing a great threat to humans and the environment. In recent y...

Claims

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Application Information

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IPC IPC(8): G01N21/67
CPCG01N21/67G01N21/69
Inventor 陆泉芳杨恕修俞洁张海涛孙对兄
Owner NORTHWEST NORMAL UNIVERSITY
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