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Method for analyzing trace elements by combining surface enhancement and discharge-assisted LIBS (laser-induced breakdown spectroscopy)

A surface enhancement, trace element technology, applied in thermal excitation analysis, material excitation analysis, etc., can solve the problems of large background radiation, only one sample can be obtained, the stability of discharge, the influence of surface roughness of samples, etc.

Pending Publication Date: 2022-07-26
JILIN UNIV
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Problems solved by technology

However, SIBS technology also has its inherent disadvantages: the background radiation generated by high-voltage and high-current spark discharge is large and harmful to the human body; the stability of the discharge is affected by the roughness of the sample surface
Although the above method can reduce the LoD of Pb element, it also has certain disadvantages, such as: each electrodeposition operation requires a lot of solution to be tested, and only one sample can be obtained each time

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  • Method for analyzing trace elements by combining surface enhancement and discharge-assisted LIBS (laser-induced breakdown spectroscopy)
  • Method for analyzing trace elements by combining surface enhancement and discharge-assisted LIBS (laser-induced breakdown spectroscopy)
  • Method for analyzing trace elements by combining surface enhancement and discharge-assisted LIBS (laser-induced breakdown spectroscopy)

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[0031] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0032] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0033] An embodiment of the present invention provides a method for analyzing trace elements in combination with surface enhancement and discharge-assisted LIBS, comprising the following steps:

[0034] Step S1: use an electronic balance to weigh a certain amount of CrCl 3 ·6H 2 O, CuSO 4 ·5H 2 O and Pb (NO 3 ) 2 powder, and then use deionized water to make 10 μg / mL stock solution and dilute it to obtain standard solutions of different concentrations...

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Abstract

The invention is suitable for the technical field of heavy metal element analysis, provides a method for analyzing trace elements by combining surface enhancement and discharge-assisted LIBS (Laser-induced Breakdown Spectroscopy), and overcomes the problems of low sensitivity and accuracy when LIBS is used for directly detecting a liquid sample. Compared with the surface-enhanced LIBS without discharge assistance, the surface-enhanced LIBS with discharge assistance can obviously improve the spectral line intensity of Cr (I), Cu (I) and Pb (I); compared with a surface-enhanced LIBS (laser-induced breakdown spectroscopy) technology without discharge assistance, the surface-enhanced LIBS technology with discharge assistance has the advantage that the LoD (Load Downlink) of the surface-enhanced LIBS with discharge assistance is respectively reduced from 3.33 ng / mL, 5.55 ng / mL and 10.07 ng / mL to 1.19 ng / mL, 2.64 ng / mL and 3.86 ng / mL. Therefore, the trace heavy metal Cr, Cu and Pb elements in the aqueous solution can be subjected to high-sensitivity analysis through the combination of surface enhancement and discharge-assisted LIBS (Laser-induced Breakdown Spectroscopy).

Description

technical field [0001] The invention belongs to the technical field of heavy metal element analysis, and particularly relates to a method for combining surface enhancement and discharge-assisted LIBS to analyze trace elements. Background technique [0002] In recent years, the pollution and damage of heavy metal elements to the environment has become increasingly serious, which seriously affects the health and survival of human beings. High-sensitivity detection of harmful heavy metal elements in water has always been the focus of attention. Therefore, it is necessary to develop a heavy metal pollution monitoring technology with high detection sensitivity and a wide range of detection elements. Currently, many techniques (electrochemical analysis, atomic absorption spectrometry, inductively coupled plasma mass spectrometry, and inductively coupled plasma atomic emission spectrometry, etc.) have been developed for the detection of heavy metal elements. [0003] Laser-induce...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/71
CPCG01N21/71
Inventor 陈安民王秋云姜远飞李苏宇金明星
Owner JILIN UNIV
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