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A kind of sample preparation and calibration method for on-line monitoring of water sample laser-induced breakdown spectroscopy

A technology of laser-induced breakdown and spectroscopy, which is applied in laser spectrum analysis and electromechanical fields, can solve problems such as difficult calibration, unfavorable on-site online monitoring, and unstable signals, and achieves simplified experimental operations, solved calibration problems, and a compact structure Effect

Active Publication Date: 2022-07-08
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

However, there are two problems when using LIBS to directly analyze elements in water bodies: 1) It is difficult to obtain highly sensitive and stable signals due to strong absorption, sputtering, and signal instability in water bodies; 2) Calibration is difficult due to the influence of sample matrix
The application of these methods has promoted the development of LIBS analysis technology, but they are all limited to the stage of laboratory analysis and research, and some methods are complicated in process, which is not conducive to the realization of on-site online monitoring

Method used

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  • A kind of sample preparation and calibration method for on-line monitoring of water sample laser-induced breakdown spectroscopy
  • A kind of sample preparation and calibration method for on-line monitoring of water sample laser-induced breakdown spectroscopy
  • A kind of sample preparation and calibration method for on-line monitoring of water sample laser-induced breakdown spectroscopy

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Embodiment Construction

[0032] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0033] like figure 1 Schematic diagram of the structure of the graphite sheet. The graphite flakes used for enrichment are high-purity graphite flakes with almost no impurities, a diameter of 30mm, a thickness of 2.5mm, and an annular groove with an outer diameter of 18mm, an inner diameter of 12mm, and a depth of about 1mm in the center. As shown in the figure, a layer of iron metal ring is inlaid on the periphery of the graphite sheet. The inner diameter of the outer ring is 21mm, the outer diameter is 27mm, and the thickness is 2mm. It is used to be adsorbed by the electromagnet when the sample is removed. The iron metal ring can be recycled and reused. . The sample is enriched into the annular groove, which can greatly reduce the problem of uneven enrichment caused by the coffee ring effect, and the enrichment amount is about 60uL.

[0034] like ...

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Abstract

The invention discloses a method for preparing and calibrating a sample for on-line monitoring of a laser-induced breakdown spectrum of a water sample, and belongs to the technical field of electromechanical and laser spectrum analysis. It combines external standard method, standard addition method and laser-induced breakdown spectroscopy technology, and realizes automation, which greatly improves the efficiency of experimental operation and reduces the influence of matrix effect on quantitative analysis of different water quality. The whole device has a compact structure, is flexible and convenient to use, and is suitable for the analysis of elements in the solution medium by LIBS technology. It can be used in various indoor and outdoor working environments, and is especially suitable for on-site element detection.

Description

technical field [0001] The invention relates to a method for preparing and calibrating a sample for on-line monitoring of a laser-induced breakdown spectrum of a water sample, belonging to the field of electromechanical technology and the technical field of laser spectrum analysis. Background technique [0002] Laser-Induced Breakdown Spectroscopy (LIBS) is a technique for rapid analysis of material elements. It uses a short-pulse laser focused by a lens to ablate the surface of the detected material to generate a miniature plasma. These plasmas emit spectral signals and their intensities to determine the elements present and their concentrations. This analysis technology has many outstanding advantages: no sample preparation, rapid real-time, in-situ on-site, simultaneous detection of multiple elements, and diverse forms of detected objects, etc., and has wide application prospects. However, there are two problems when using LIBS to directly analyze elements in water: 1) I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/71G01N35/00G01N35/10
CPCG01N21/71G01N35/00G01N35/10G01N35/1016G01N2035/00346G01N2035/1037Y02A90/30
Inventor 方丽赵南京马明俊黄行九孟德硕殷高方江敏刘建国刘文清
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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