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Sample preparation method for quantitative analysis of water elements based on laser induced breakdown spectrum

A technology of laser-induced breakdown and quantitative analysis, which is applied in the field of atomic emission spectroscopy detection, can solve the problems of uneven sample preparation and uncontrollable droplet diffusion range, and achieve the effect of low cost, easy control, and enrichment

Active Publication Date: 2016-09-21
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention provides a sample preparation method for quantitative analysis of water body elements based on laser-induced breakdown spectroscopy. Control and other problems, to achieve accurate analysis of liquid heavy metal elements

Method used

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  • Sample preparation method for quantitative analysis of water elements based on laser induced breakdown spectrum
  • Sample preparation method for quantitative analysis of water elements based on laser induced breakdown spectrum
  • Sample preparation method for quantitative analysis of water elements based on laser induced breakdown spectrum

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specific Embodiment 1

[0067] Taking the heavy metal element cadmium (Cd) as an example, the metal substrate 1 selected for surface-enhanced LIBS detection in the experiment is pure metal zinc. The aqueous solution 5 to be tested is a heavy metal cadmium solution, which is prepared by first configuring the chemical reagent CdCl2·2.5H2O and distilled water into a 500 μg / mL mother solution, and then diluting the mother solution into the standard solution required for the experiment. The concentrations of the standard solutions after configuration are respectively 10, 20, 30, 40, 50 and 60 μg / mL. The standard solution prepared according to figure 1 and figure 2 The schematic diagram and flow chart of the sample preparation method are shown to prepare samples respectively.

[0068] image 3 (a) and (b) are samples prepared by titration method and filter paper method, respectively. The cadmium chloride solution of each concentration was prepared three times respectively. The samples prepared by the...

specific Embodiment 2

[0072] Select the sample preparation parameters in the specific implementation case 1: the sampling volume is 45mL, the heating temperature is 70°C, and the preparation time is about 3 minutes. then use figure 2 The common LIBS detection device shown carries out spectral collection on the prepared sample, wherein the laser 8 adopts the Brilliant B-type Nd:YAG pulsed laser (wavelength 532nm, pulse width 5ns) of Quantel Company, the laser repetition frequency is set to 10Hz, and the pulsed laser is sequentially Pass through the diaphragm 9, the dichroic mirror 10 and the plano-convex focusing lens 11 (f=100mm), and finally focus vertically on the dry droplet 6 on the metal surface. To prevent air breakdown, the selective focus was placed 4 mm below the sample surface. The plasma radiated light generated by the laser breakdown of the sample to be tested is transmitted to the spectrometer 14 (Andor Technology, ME5000) through the optical collector 12 through the optical fiber 13...

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Abstract

The invention discloses a sample preparation method for quantitative analysis of water elements based on a laser induced breakdown spectrum. The method includes the steps that S1, a metal substrate not containing to-be-detected elements is acquired, the surfaces of the metal substrate are polished, and the upper surface and the lower surface of the metal substrate are made parallel; 2, filter paper is cut, wherein the area of the cut filter paper is smaller than that of the surfaces of the metal substrate; S3, the cut filter paper is placed on the polished surfaces of the metal substrate, to-be-detected liquid drops drip on the filter paper on the surfaces of the metal substrate, and the filter paper is heated; S4, after heating is completed, the filter paper is removed, and a heavy metal containing dry sample which is evenly distributed and consistent in diffusion range is acquired on the surfaces of the metal substrate. The filter paper serves as an intermediate conversion layer of the liquid drops and the metal substrate, even diffusion of the liquid sample is achieved through the even hole diameter of the filter paper, the diffusion range of liquid is limited through the fixed size of the filter paper, and sample preparation is easy to control and good in repeatability.

Description

technical field [0001] The invention belongs to the technical field of atomic emission spectroscopy detection, and specifically relates to a sample preparation method for quantitative analysis of water body elements based on laser-induced breakdown spectroscopy, which is mainly applied to the detection and analysis of heavy metal elements in water. Background technique [0002] Heavy metals have the characteristics of high toxicity, easy to be enriched by organisms, and difficult to metabolize, which seriously threaten human health. Among them, excessive heavy metal elements in water will affect the stability of the entire ecosystem, so it is very important to quickly and sensitively detect heavy metal elements. Laser Induced Breakdown Spectroscopy (LIBS) can be applied to the rapid detection of heavy metal elements in water due to its advantages of real-time, rapid, in-situ, and multi-element detection. [0003] However, the direct detection of water using LIBS technology ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/71
CPCG01N21/718
Inventor 李祥友杨新艳曾晓雁郭连波陆永枫李阔湖李嘉铭喻惠武易荣兴
Owner HUAZHONG UNIV OF SCI & TECH
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