Rapid tobacco root cadmium content detection method based on laser induced breakdown spectroscopy technology

Abstract

The invention discloses a rapid tobacco root cadmium content detection method based on a laser induced breakdown spectroscopy technology. According to the method, the parameters of an instrument for collecting LIBS spectral data are optimized, the specific tobacco root sample spectral line emitted by plasma after high-energy laser ablation is collected by using the optimized target parameters, thesignal at the cadmium element characteristic wavelength of 361.05 nm is selected as an input value, the cadmium content in the sample is used as an output value, the regression model of the signal atthe characteristic wavelength and the cadmium content is established by using a unary linear regression method, the determination coefficient R2 of the established model is 0.96, prediction set datais input into the regression model, the cadmium contents of the prediction set samples are detected, and the prediction determination coefficient R2 is 0.92. According to the present invention, the cadmium element in the tobacco root can be rapidly detected, the method has characteristics of simple operation, low cost and the like, and by optimizing the parameters, 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 cadmium content in tobacco roots based on laser-induced breakdown spectroscopy technology. 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 campa...

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Problems solved by technology

However, because the LIBS signal is easily affected by the matrix, and the detection parameters required for different objects are different, 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

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