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Detection of heavy metals and trace elements in crops based on double-pulse laser-induced breakdown spectroscopy

A technology of laser-induced breakdown and trace elements, applied in the direction of material excitation analysis, etc., can solve the problems of not reflecting the distribution of elements, high cost, complicated operation, etc., and achieve the effect of low cost, fast detection and simple operation

Active Publication Date: 2016-09-28
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 on the plant surface, satisfying the real-time and rapid acquisition of crop heavy metal and trace element information.

Method used

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  • Detection of heavy metals and trace elements in crops based on double-pulse laser-induced breakdown spectroscopy
  • Detection of heavy metals and trace elements in crops based on double-pulse laser-induced breakdown spectroscopy
  • Detection of heavy metals and trace elements in crops based on double-pulse laser-induced breakdown spectroscopy

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Embodiment Construction

[0032] Such as 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 attenuato...

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Abstract

The invention discloses a method for detecting heavy metals and trace elements in crops based on double-pulse laser-induced breakdown spectroscopy. After the high temperature, hit the surface of the sample vertically to generate plasma; another laser directly hits the plasma; collect the characteristic spectral lines; according to the test and heavy metals and trace elements, select from the characteristic spectral lines that there is no self-absorption and the four spectral lines with self-inversion and the highest intensity; with the sample reference value as the output and the spectral line intensity as the input, a variety of multiple regression models are established, four optimal models are selected, and the prediction results of these four models are used As an input, a comprehensive model is established with the sample reference value as an output; for the fresh plant leaves to be tested, four spectral line intensities are obtained and input into the comprehensive model to calculate the contents of heavy metals and trace elements.

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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Patent Type & Authority Patents(China)
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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