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Blade-heavy-metal-content detection method with moisture content corrected based on Ca element ratio

A detection method and ratio correction technology, applied in the field of laser spectroscopy, can solve the problems of rapid detection of laser-induced breakdown spectrum, increase of detection and analysis time, etc., to overcome long detection time, fast detection, and solve LIBS spectral line drift Effect

Active Publication Date: 2017-04-26
ZHEJIANG UNIV
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Problems solved by technology

However, such preprocessing methods will increase the detection and analysis time, and cannot reflect the advantages of rapid detection of laser-induced breakdown spectroscopy.

Method used

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  • Blade-heavy-metal-content detection method with moisture content corrected based on Ca element ratio
  • Blade-heavy-metal-content detection method with moisture content corrected based on Ca element ratio
  • Blade-heavy-metal-content detection method with moisture content corrected based on Ca element ratio

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Embodiment Construction

[0038] The present invention will be described in detail below in conjunction with specific embodiment and accompanying drawing, and the concrete steps of detecting Cr element content in rice are as follows:

[0039] 1. The experimental rice variety is Chunyou 84, which is a single-season indica-japonica hybrid rice widely planted in Zhejiang Province. After the rice seeds were sterilized by NaClO solution for 30 min, they were washed several times with tap water and distilled water respectively, soaked in the dark at 25°C for 2 days, and then placed at 35°C for 1 day to accelerate germination. The germinated rice seeds were sown in containers containing perlite and cultured in an artificial climate growth chamber. The hydroponic conditions of rice were: photoperiod, 14h / 10h; temperature, 30°C / 22°C; light intensity, 225μmol m -2 the s -1 ; Relative humidity 85%. After the rice was cultured in distilled water for 15 days, it was cultured in nutrient solution. Five Cr levels...

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Abstract

The invention discloses a blade-heavy-metal-content detection method with the moisture content corrected based on the Ca element ratio. The blade-heavy-metal-content detection method includes the steps that 1) blade samples with the different heavy-metal contents are obtained, and the samples are pretreated; 2) the heavy-metal contents in the samples are detected with the standard method; 3) LIBS spectral lines of the samples at different positions are collected; 4) obtained spectral signals are pretreated; 5) the peak strength of the LIBS spectral lines corresponding to detected heavy-metal elements and the peak strength of the LIBS spectral line corresponding to a Ca element are extracted; 6) the detected heavy-metal content serves as an output value, the strength ratio of the detected heavy-metal elements to the Ca element serves as an input value, and a calibration model is established; 7) the spectral lines of to-be-detected samples are collected, and the peak strength of the LIBS spectral lines corresponding to the detected heavy-metal elements and the peak strength of the LIBS spectral line corresponding to the Ca element are extracted in the pretreated spectral signals and input into the calibration model, and the content of heavy metal is obtained. According to the blade-heavy-metal-content detection method, the moisture contents in the samples are corrected, the influence of the moisture contents in the samples on heavy metal detection is eliminated, and the detection accuracy is increased.

Description

technical field [0001] The invention relates to laser spectrum technology, in particular to a method for detecting heavy metal content in leaves based on Ca element ratio to correct water content. Background technique [0002] Laser-induced breakdown spectroscopy (LIBS) is an emerging atomic analysis technique, which has the characteristics of fast, simple pretreatment, multi-element analysis and online remote analysis. Its detection objects can include gas, solid and liquid. It detects and analyzes the plasma transition lines produced by laser ablation samples, combined with quantitative analysis methods to detect element content. In theory, laser-induced breakdown spectroscopy can detect all elements on the periodic table. At present, laser-induced breakdown spectroscopy has been used in archaeology, biomedicine, geochemistry, military, industry and other fields, mainly including heavy metal detection, identification of dangerous substances, and analysis of important ele...

Claims

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Application Information

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IPC IPC(8): G01N21/71
CPCG01N21/718
Inventor 苏珍珠刘飞彭继宇申婷婷叶蓝韩孔汶汶何勇
Owner ZHEJIANG UNIV
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