Method for detecting copper content in rice based on single-pulse laser-induced breakdown spectrum technology

A laser-induced breakdown and detection method technology, applied in thermal excitation analysis, material excitation analysis, etc., can solve the problems of long single detection time, expensive equipment, secondary pollution, etc., and achieve simple sample pretreatment and simple instrument operation , the effect of mass detection

Inactive Publication Date: 2017-03-15
ZHEJIANG UNIV
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Problems solved by technology

Although these traditional detection methods have the advantages of high detection accuracy and good stability, there are some obvious defects-the need for complex chemical pretreatm

Method used

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  • Method for detecting copper content in rice based on single-pulse laser-induced breakdown spectrum technology
  • Method for detecting copper content in rice based on single-pulse laser-induced breakdown spectrum technology

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Embodiment Construction

[0036] In the present embodiment, the detection method of copper element content in finished rice, concrete steps are as follows:

[0037] (1) Preparation of test samples, with 3 varieties of commercially available rice (ordinary rice, Jiangsu rice and Simiao rice) with different copper content, after grinding, sieving and pressing into tablets, as the test object, the mass of each sample is 0.5 g;

[0038] Prepare copper solutions with 9 concentration gradients, numbered 1, 2, 3, ..., 9 according to the copper content from 0 to 1000ppm. At 4°C, soak the rice samples for 48 hours, rinse them with ultrapure water three times, dry them at room temperature, grind them, sieve them (200 mesh), weigh 0.5 g, and press them into tablets with a tablet machine as samples. . For each concentration, 5 tablets were pressed in parallel, and 3 varieties of rice were pressed, and a total of 135 samples were obtained;

[0039] (2) collect the LIBS spectrum (X) of each test sample;

[0040]...

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Abstract

The invention discloses a method for detecting the copper content in rice based on the single-pulse laser-induced breakdown spectrum technology. The method includes the steps that 1, the rice is soaked with a copper solution, after the rice is dried at room temperature, grinding and sieving are carried out, and the rice is pressed into tablets through a tablet press; 2, laser-induced breakdown spectrum data X of various test samples is acquired; 3, flame-atomic absorption spectroscopy is selected to measure the real content Y of copper in the samples with various concentrations; 4, according to the corresponding relation between wavelengths and elements, original LIBS spectrum data is searched for wave crest intensities X1 corresponding to Cu I 324.754 nm and Cu I 327.396 nm; 5, after abnormal samples are removed, data X2 is obtained; 6, the data X2 is preprocessed, and a data set X3 is obtained; 7, by means of linear fitting, X3 serves as input, Y serves as output, and a linear regression model is established; 8, the linear regression model is used for carrying out quantitative analysis on the copper content in a certain number of samples, and the accuracy of the model is verified.

Description

technical field [0001] The invention relates to a technology for detecting heavy metal content in agricultural products, in particular to a method for detecting copper content in rice based on single-pulse laser-induced breakdown spectroscopy technology. Background technique [0002] Rice is one of the important ways for the human body to obtain energy and mineral elements, especially for Chinese people, it is one of the indispensable and important foods in daily life. Copper (Cu) is a trace mineral element in rice, and it is also an essential trace element for the human body. However, due to the metal pollution in the environment, Cu content in rice accumulates, which is potentially toxic to human health. Studies have shown that long-term consumption of foods with excessive Cu content may increase the incidence of cancer. Therefore, how to quickly and accurately detect the copper content in rice is of great significance to the detection of heavy metals in agricultural pro...

Claims

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Application Information

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IPC IPC(8): G01N21/71
CPCG01N21/71G01N21/718
Inventor 刘飞叶蓝韩宋坤林彭继宇冯雷何勇
Owner ZHEJIANG UNIV
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