NIR (Near Infrared Ray) spectral analysis model and method for identifying excessive content of cadmium in rice
A technology of spectral analysis and rice cadmium, which is applied in the field of near-infrared spectral detection, can solve problems that have not been proposed, such as large strong acid reagents, professional operation, etc., to eliminate the influence of spectral scattering and the limitation of dimension and order of magnitude, and improve accuracy and stability, the effect of eliminating random noise
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Embodiment 1
[0048] A NIR spectral analysis model for identifying excessive cadmium content in rice, the NIR spectral analysis model is established by the following method:
[0049] 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
[0067] A kind of identification method adopting the NIR spectrum analysis model of embodiment 1 to whether cadmium content in rice exceeds the standard, specifically comprises the following steps:
[0068] a. Collect the spectral data of the rice to be tested: use the NIR spectrometer as the 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.
[0069] The steps for NIR spectrometer to collect the standard spectrum are as follows: import 3g of the rice sample to be tested into the diffuse reflection sample cup, and then use the sample cover to carefully cover the sample cup to eliminate the influence of sample inhomogeneity on the optical path; then use the built-in The background is used as a reference, and the wavenumber is 10000cm with NIR spectrum scanning -1 ~4000cm -1 The range is 32 times (the number of scan...
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