High-sensitivity soil heavy metal element detection device and detection method

A detection device and high-sensitivity technology, applied in the field of LIBS detection, can solve the problems of low sensitivity of heavy metal elements, continuous background interference, low analysis accuracy, etc., so as to reduce the influence of uneven doping and the influence of ablation instability , the effect of high analysis accuracy

Inactive Publication Date: 2020-12-01
CHANGCHUN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The first object of the present invention is to provide a high-sensitivity soil heavy metal element detection device to solve the problem of low sensitivity and poor repetition rate of heavy metal elements detected by nanosecond LIBS, and low energy and spectral intensity when femtosecond LIBS is used for detection. Low, prone to overlapping interference and continuous background interference, leading to technical problems of low analysis accuracy

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  • High-sensitivity soil heavy metal element detection device and detection method
  • High-sensitivity soil heavy metal element detection device and detection method
  • High-sensitivity soil heavy metal element detection device and detection method

Examples

Experimental program
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Embodiment 1

[0049] Embodiment 1 highly sensitive soil heavy metal element detection device

[0050] Such as figure 1 As shown, the present invention provides a heavy metal element detection device in soil based on double-beam LIBS, including: a femtosecond laser 1, a first energy attenuation system 2, a first focusing lens 3, a nanosecond laser 6, a second energy attenuation system 7, Climbing system, second focusing lens 11, two-dimensional translation stage 5, soil target clamp 4, third focusing lens 12, attenuation sheet 13, fiber optic probe 14, spectrometer 15, time delay system 16 and PC terminal 17;

[0051] Wherein, the femtosecond laser 1 is used to output femtosecond pulsed laser, and the femtosecond pulsed laser output by it is focused by the first energy attenuation system 2 and the first focusing lens 3 to form a section of plasma filament in the air, The plasma filament acts on the surface of the soil target, and the plasma generated by the soil target undergoes expansion a...

Embodiment 2

[0067] Embodiment 2 highly sensitive soil heavy metal element detection method

[0068]Step S1: femtosecond pulse laser 1 outputs femtosecond pulse laser, and femtosecond pulse laser is transmitted in the air, the first energy attenuation system 2 ensures that the ablation energy of femtosecond pulse laser is fixed for each experiment, and then the femtosecond pulse laser is focused by the first focusing lens 3 After that (the distance from the first focusing lens to the surface of the soil target is 400-600mm), a section of plasma filament is formed in the air, and the plasma filament ablates the soil target, and the soil target remains fixed in the direction of filament formation. Utilize the one-dimensional translation stage under the first focusing lens 3 to control the position of the femtosecond focused filament ablation soil target, and obtain the characteristic spectral radiation intensity space of the filament ablation soil target generated by the femtosecond laser in ...

Embodiment 3

[0075] Example 3 Effect of Femtosecond Laser Focusing Lens Position on Spectral Intensity

[0076] In this embodiment, the soil target material containing heavy metal Pb is detected. During the detection, the femtosecond laser energy is 3.0mJ, and the position of the femtosecond laser focusing lens is changed (the first focusing lens 3 is 472-492mm away from the soil target material position), and the femtosecond laser energy is obtained. Spatial evolution of spectral intensity of soil target by laser filamentation ablation in seconds (such as figure 2 shown); due to the femtosecond filamentation intensity clamping effect, the plasma radiation spectral intensity (PbI405.78nm) does not change much within a certain distance; it can be seen that the use of femtosecond laser characteristics can reduce the surface roughness of the sample The influence brought about improves the detection accuracy.

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Abstract

The invention relates to a high-sensitivity soil heavy metal element detection device and detection method, the device includes: a femtosecond laser, a first energy attenuation system, a first focusing lens, a nanosecond laser, a second energy attenuation system, a climbing system, a second Focusing lens, two-dimensional translation stage, third focusing lens, attenuation sheet, fiber optic probe, spectrometer, time delay system; the femtosecond pulsed laser output by the femtosecond laser is focused by the first energy attenuation system and the first focusing lens, and then in the air A section of plasma filament is formed in the middle, and the plasma filament acts on the surface of the soil target, and the plasma generated by the soil target undergoes expansion and cooling of the air environment to form a local soil particle source; the nanosecond pulse laser output by the nanosecond laser After being focused by the second energy attenuation system, the climbing system, and the second focusing lens, the source of soil particles produced by burning plasma filaments is re-ablated. The detection device has high sensitivity and precision.

Description

technical field [0001] The invention belongs to the technical field of LIBS detection, and in particular relates to a highly sensitive soil heavy metal element detection device and detection method. Background technique [0002] According to the national survey of sewage irrigation areas conducted by the Ministry of Agriculture of my country, among the approximately 1.4 million hectares of sewage irrigation areas, the area of ​​land polluted by heavy metals accounts for 64.8% of the area of ​​sewage irrigation areas, of which 46.7% are lightly polluted and 9.7% are moderately polluted. %, serious pollution accounted for 8.4%. What is more dangerous is that heavy metal pollutants have poor mobility in the soil and a long residence time. Most microorganisms cannot degrade them. Most heavy metals can eventually endanger human health through water, plants and other media. [0003] The detection and prevention of heavy metal pollution in soil has become a major issue related to th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/01G01N21/73G01N21/94
CPCG01N21/01G01N21/73G01N21/94
Inventor 高勋赵上勇任佳林景全
Owner CHANGCHUN UNIV OF SCI & TECH
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