Double-pulse laser induced breakdown spectroscopy-based method applied to detection of heavy metals and microelements in crops

A laser-induced breakdown and trace element technology, applied in material excitation analysis and other directions, can solve the problems of high cost, complicated operation, and cannot reflect the distribution of elements, and achieve the effect of low cost, simple operation, and optimization of detection parameters.

Active Publication Date: 2015-02-25
ZHEJIANG UNIV
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Problems solved by technology

However, these methods are complicated to operate, high in cost, and cannot reflect the distribution of elements ...

Method used

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  • Double-pulse laser induced breakdown spectroscopy-based method applied to detection of heavy metals and microelements in crops
  • Double-pulse laser induced breakdown spectroscopy-based method applied to detection of heavy metals and microelements in crops
  • Double-pulse laser induced breakdown spectroscopy-based method applied to detection of heavy metals and microelements in crops

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Embodiment Construction

[0032] like figure 1 As shown, the crop heavy metal and trace element detection device among the present invention includes: double-pulse solid-state laser 1, delay generator 2, energy attenuator 3, laser energy real-time monitoring system 4, optical path climbing system 5, detector 6, A spectrometer 7 , a second focusing lens 8 , a sample stage 9 , a first focusing lens 10 , an optical fiber collection system 11 and a sample surface imaging system 12 .

[0033] The working mode of the system is selected according to whether the crop sample is pressed or not. When the sample is a compressed tablet, a collinear structure is used. The delay generator 2 controls the trigger time of the Q-switching switch of the double-pulse solid generator 1 and the start-up trigger time of the xenon lamp. Under the control of the delay generator 2, the double-pulse solid-state laser 1 generates a coaxial 532nm (1064nm) double-pulse laser. The laser light passes through the energy attenuator 3...

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Abstract

The invention discloses a double-pulse laser induced breakdown spectroscopy-based method applied to detection of heavy metals and microelements in crops. The method comprises the following steps: sequentially sending two paths of lasers with different axes by a double-pulse solid laser under the control of a delay generator, enabling one path of laser to climb along a light path and to vertically impact the surface of a sample so as to stimulate generation of plasma, and enabling the other path of laser to directly impact the plasma; collecting characteristic spectral lines; choosing four spectral lines free of self absorption, self inversion and with highest strength from the characteristic spectral lines according to to-be-detected heavy metals and microelements; building a plurality of multi-element regression models by taking a sample reference value as output and taking the strength of the spectral lines as input, choosing four optimal models, and building a comprehensive model by taking prediction results of the four models as input and taking the sample reference value as output; and inputting the obtained strength of the four spectral lines into the comprehensive model on account of to-be-detected fresh plant leaves, and calculating the content of the heavy metals and the microelements.

Description

technical field [0001] The invention relates to crop heavy metal and trace element detection technology, in particular to a crop heavy metal and trace element rapid detection method based on double-pulse laser-induced breakdown spectroscopy. Background technique [0002] Heavy metals (cadmium, chromium, lead, copper, etc.) and trace elements (silicon, iron, boron, etc.) have an important impact on crop life activities. Under heavy metal stress, the content of proline in crops increases, photosynthesis and respiration are inhibited to varying degrees, and crop yields decrease or even fail. The trace elements are closely related to the growth status and yield of crops. For example, Si can improve the disease resistance of crops and promote growth; Fe is a component of various enzymes in plants, and Fe deficiency can lead to chlorosis. Obtaining the information of heavy metals and trace elements of crops is conducive to understanding the growth status of crops, estimating the...

Claims

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Application Information

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IPC IPC(8): G01N21/63
CPCG01N21/718
Inventor 刘飞彭继宇何勇张初周菲孔汶汶冯雷
Owner ZHEJIANG UNIV
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