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
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[0043] Example 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: 120 different rice samples were randomly selected, and the cadmium content in 120 rice samples was determined by graphite furnace atomic absorption method, and the measured cadmium content was compared with GB-2762-2012 Food The requirements of the cadmium content limit in rice in the “Limit of Contaminants in Foods”, determine whether each rice sample exceeds the standard, and meet the requirements of the cadmium content limit in rice in the “GB-2762-2012 Limits of Contaminants in Foods” standard (ie, cadmium Rice with qualified content, 49 rice with qualified cadmium content in 120 rice samples), the judgment value is set to -1, and rice with cadmium content exceeding the limit of cadmium content in rice (120 rice samples with excessive c...
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[0062] Example 2
[0063] A method for identifying whether the cadmium content in rice exceeds the standard by using the MIR spectral analysis model of Example 1, specifically includes the following steps:
[0064] a. Collect the spectrum data of the rice to be tested: Using the MIR spectrometer as the sampling device, collect the standard spectra of 20 commercially available rice samples to be tested (the rice samples to be tested were purchased from Beishan Town, Changsha County, variety: Xiangwanxian No. 12) data.
[0065] The steps of MIR spectrometer to collect standard spectrum are: mid-infrared spectrum scanning wave number is 4000cm -1 ~500cm -1 , Take 2g sample and grind it in an agate mortar, add an appropriate amount of dried and ground potassium bromide powder, the mass ratio of sample to potassium bromide is about 1:100, fully mix and grind; mix the ground mixture Put the mold evenly between the top mold and the bottom mold, then put the mold into the press, and treat i...
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