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

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...

AI Technical Summary

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.

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