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Laser-induced breakdown spectroscopy-based method for quickly detecting copper element in tobacco

A technology of laser-induced breakdown and detection method, applied in thermal excitation analysis, material excitation analysis, etc., can solve problems such as the influence of LIBS signal, improve applicability and stability, avoid sample unevenness, and optimize instrument parameters.

Inactive Publication Date: 2017-05-31
ZHEJIANG UNIV
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Problems solved by technology

However, because the LIBS signal is easily affected by the matrix, in order to ensure the stability of the collected signal and improve the detection accuracy, it is necessary to optimize the instrument parameters of the collected signal

Method used

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  • Laser-induced breakdown spectroscopy-based method for quickly detecting copper element in tobacco
  • Laser-induced breakdown spectroscopy-based method for quickly detecting copper element in tobacco
  • Laser-induced breakdown spectroscopy-based method for quickly detecting copper element in tobacco

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Embodiment Construction

[0045] The method for rapid detection of copper in tobacco leaves based on laser-induced breakdown spectroscopy of the present invention will be further described in detail below in conjunction with the accompanying drawings, and the specific steps include:

[0046] (1) Prepare test samples, divide 60 tobacco plants into 6 groups on average, set 5 groups of experimental groups and a group of control groups, and the experimental groups use concentrations of 25mg / L, 50mg / L, 75mg / L, 100mg / L respectively , 125mg / L of CuSO solution stress, the control group added an equal amount of water, heavy metal stress for one month, and picked a leaf at the same leaf position on each tobacco plant, a total of 60. The fresh leaves are cleaned, dried, ground, and mixed evenly, and 0.15g of powder is weighed from each sample, pressed into a square sheet, and the sample preparation is completed.

[0047](2) Select several samples of the same concentration for parameter optimization:

[0048] The...

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Abstract

The invention discloses a laser-induced breakdown spectroscopy-based method for quickly detecting a copper element in tobacco. The method comprises the steps of firstly optimizing instrument parameters of collected LIBS spectral data, collecting a specific spectral line emitted from plasma after high-energy laser ablation of a tobacco tablet sample by using the optimized parameters of laser energy, delay and integral time; after pretreatment, selecting a signal which is 32.8nm from a characteristic band of the copper element as an input value and the copper element content in the sample as an output value; building a regression model of a characteristic band signal and the copper element content by using a unitary exponential regression method, wherein the determination coefficient R2 of the built model reaches 0.9213; and inputting prediction set data into the regression model, detecting the copper content of the prediction set sample, and predicting that the determination coefficient R2 reaches 0.9527. Fast detection of the copper element in the tobacco is achieved, and the method has the characteristics of being simple in operation and low in cost; and meanwhile, through parameter optimization, the detection accuracy, the stability and the applicability of the method are improved.

Description

technical field [0001] The invention relates to tobacco heavy metal element detection technology, in particular to a rapid detection method for tobacco leaf copper element based on laser-induced breakdown spectroscopy. Background technique [0002] During mining, smelting, and processing, heavy metals enter the atmosphere, water, and soil to cause environmental pollution, and then enter plants. Therefore, detection of plant heavy metal content has become an important method to judge the degree of environmental heavy metal pollution. At present, the detection methods of heavy metal elements in plants mainly include high performance liquid chromatography, spectrophotometry, atomic spectroscopy, inductively coupled plasma mass spectrometry and so on. However, these methods are complex in operation and high in cost, and cannot meet the requirements of quickly obtaining the content of heavy metals in plants. [0003] With the increasing global anti-smoking campaign and the impl...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/71
CPCG01N21/71G01N21/718
Inventor 刘飞宋坤林刘小丹彭继宇孔汶汶叶蓝韩何勇
Owner ZHEJIANG UNIV
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