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MIR spectral analysis model and method for identifying excessive cadmium content of rice.

A technology for spectral analysis and cadmium in rice is applied in the field of MIR spectral analysis models for identifying excess cadmium content in rice, which can solve the problems of low model identification rate, complex model, slow calculation speed, etc. high rate effect

Inactive Publication Date: 2015-02-25
湖南省食品测试分析中心
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects of low model identification rate, slow operation speed and complex model in the above-mentioned technology, and provide a method for identification with simple operation, fast detection, safety and environmental protection, simple model operation, fast calculation speed and high detection accuracy. MIR spectral analysis model and identification method of excessive cadmium content in rice

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  • MIR spectral analysis model and method for identifying excessive cadmium content of rice.
  • MIR spectral analysis model and method for identifying excessive cadmium content of rice.
  • MIR spectral analysis model and method for identifying excessive cadmium content of rice.

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Embodiment 1

[0044] A MIR spectral analysis model for identifying excessive cadmium content in rice, the MIR spectral analysis model is established by the following method:

[0045] 1. Sample selection and determination of qualified rice: randomly select 120 different rice samples, use graphite furnace atomic absorption method to measure cadmium content in 120 rice samples respectively, and compare the measured cadmium content with "GB-2762-2012 Food According to the requirements of the cadmium content limit in rice in the "Limits of Pollutants in Food", determine whether each rice sample exceeds the standard, and will meet the requirements of the cadmium content limit in rice in the "GB-2762-2012 Limits of Pollutants in Food" standard (that is, cadmium 120 rice samples with qualified cadmium content, 49 rice samples with qualified cadmium content), the judgment value is set to -1, rice with excessive cadmium content exceeding the limit requirements for rice (120 rice samples with excessive...

Embodiment 2

[0063] A method for discriminating whether the cadmium content in rice exceeds the standard using the MIR spectrum analysis model of embodiment 1, specifically comprises the following steps:

[0064] a. Collect the spectral data of the rice to be tested: use the MIR spectrometer as a sampling device to collect the standard spectra of 20 commercially available rice samples to be tested (the rice samples to be tested were purchased in Beishan Town, Changsha County, variety: Xiangwan Xian 12) data.

[0065] The steps for the MIR spectrometer to collect the standard spectrum are: the mid-infrared spectrum scanning wavenumber is 4000cm -1 ~500cm -1 , take 2g of the sample and grind it finely in an agate mortar, add an appropriate amount of dried and ground potassium bromide powder, the mass ratio of the sample to potassium bromide is about 1:100, mix and grind thoroughly; the ground mixture Evenly put it between the top mold and the bottom mold of the mold, then put the mold into...

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Abstract

The invention discloses an MIR spectral analysis model and an identifying method for excessive cadmium content of rice. The analysis model is established by use of the steps of sample selection and judgment of qualified rice, acquisition of sample spectral data, processing of the sample spectral data, screening of the sample spectral data, establishment of a preliminary analysis model, verification of the preliminary analysis model and the like, and the MIR spectral analysis model for identifying excessive cadmium content of rice is determined. The invention also provides a method for identifying whether the cadmium content of rice is excessive by use of the MIR spectral analysis model. According to the invention, on the basis of identifying whether the cadmium content of samples of a large amount of rice is excessive by use of a chemical method, the MIR spectral analysis model for identifying whether the cadmium content of rice is excessive based on mid-infrared spectroscopy and a chemometrics method is established by acquiring the mid infra-red spectrum of the rice sample in combination with the least square support vector machine classification method, and the accuracy rate is more than 93.1%; the MIR spectral analysis model and the identifying method for excessive cadmium content of rice have the advantages of simplicity in operations, quickness in detection, safety, environmental protection and the like.

Description

technical field [0001] The invention belongs to the technical field of mid-infrared (Mid infrared, MIR) spectral detection, and relates to an MIR spectral analysis model and identification method for identifying excessive cadmium content in rice. Background technique [0002] Rice is the main food crop in my country, and 65% of Chinese people take rice as staple food. The quality of rice is directly related to people's health. Cadmium (Cd) is a heavy metal element that widely exists in nature and has strong toxicity. Rice is considered to be the most cadmium-absorbing bulk cereal crop, and cadmium is easily absorbed and accumulated by rice. Cadmium pollution in rice fields not only leads to a decrease in rice yield, but more seriously, cadmium accumulates in rice plants and is transmitted through the soil-plant-human food chain, which seriously threatens human health and directly affects my country's food security. [0003] Countries around the world have established stric...

Claims

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Application Information

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IPC IPC(8): G01N21/3563G06F19/00
CPCG16C20/20
Inventor 单杨朱向荣李高阳苏东林刘伟张菊华
Owner 湖南省食品测试分析中心
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