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K-element ratio based water content calibrating type heavy metal content detecting method for leaves

A detection method and ratio correction technology, which is 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., and achieve the effect of overcoming long detection time, fast detection and ensuring reliability

Active Publication Date: 2017-06-13
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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  • K-element ratio based water content calibrating type heavy metal content detecting method for leaves
  • K-element ratio based water content calibrating type heavy metal content detecting method for leaves
  • K-element ratio based water content calibrating type heavy metal content detecting method for leaves

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Embodiment Construction

[0039] 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:

[0040] 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 are: photoperiod 14h / 10h; temperature 30℃ / 22℃; 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 were ...

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Abstract

The invention discloses a K-element ratio based water content calibrating type heavy metal content detecting method for leaves. The method comprises the following steps: 1) obtaining leave samples with different heavy metal contents, and preprocessing the samples; 2) detecting the heavy metal contents in the samples through a standard method; 3) acquiring LIBS (Laser-induced Breakdown Spectroscopy) spectrum lines of different positions of the samples; 4) preprocessing the obtained spectrum signals; 5) extracting LIBS spectrum line peak intensity corresponding to the detected heavy metal element and K element; 6) building a calibration mode by treating the tested heavy metal content as the output and the intensity ratio of the detected heavy metal element to the K element as the input; 7) acquiring the spectrum lines of the samples to be detected, extracting the LIBS spectrum line peak intensity of the heavy metal element and the K element from the preprocessed spectrum signal, and inputting into the calibration mode to obtain the heavy metal content. According to the method, the water contents in the samples are calibrated, so that the influence of the water contents in the sample on the heavy metal detection can be removed, and as a result, the detection accuracy is improved.

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 K element ratio correction of 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 e...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/71
Inventor 刘飞彭继宇何勇孔汶汶申婷婷叶蓝韩刘小丹张初岑海燕
Owner ZHEJIANG UNIV
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