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Determination method for chromium content in cotton-seed meal

A technology of element content and determination method, applied in measuring devices, material analysis through optical means, instruments, etc., can solve the problems of long analysis time, consumption, cumbersome sample preparation, etc., and achieve the goal of promoting processing and utilization and high measurement accuracy Effect

Inactive Publication Date: 2015-11-25
ZHEJIANG UNIV
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Problems solved by technology

[0004] At present, conventional chemical methods are mainly used for the determination of chromium in cottonseed, such as flame atomic absorption method and inductively coupled plasma mass spectrometry. High cost, large consumption of nitric acid, sulfuric acid and other highly corrosive and dangerous reagents

Method used

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  • Determination method for chromium content in cotton-seed meal
  • Determination method for chromium content in cotton-seed meal
  • Determination method for chromium content in cotton-seed meal

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specific Embodiment

[0028] (1) Cottonseeds are pretreated: dry the cottonseeds after velvet removal, grind the seeds into powder with a milling machine, pass through a 60-mesh sieve, and obtain cottonseed powder samples; take cottonseeds from different ecological regions and varieties in the country as samples, and press After freeze-drying in the above steps, pulverize with a sample mill to obtain the dry powder sample.

[0029] Cottonseed samples were collected from 11 regions across the country, including different ecological planting areas such as Hangzhou in Zhejiang Province, Wuhu in Anhui Province, Yancheng in Jiangsu Province, and Lixian County in Hunan Province. A total of 288 cottonseed samples were collected from multiple cotton varieties.

[0030] (2) Spectrum collection of samples

[0031] Put the cottonseed powder into the sample cell, scan each sample four times, the sample spectrum is as follows figure 2 shown.

[0032] Near-infrared spectrum analysis parameters: The model of n...

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Abstract

The invention discloses a determination method for the chromium content in cotton-seed meal. The determination method includes the steps that different kinds of cotton-seed meal samples planted in different regions are prepared, a near-infrared spectrometer is used for collecting spectrums of the cotton-seed meal samples, full cross validation is adopted in a full spectrum range to build a PLS model, and then the PLS model is analyzed by adopting eight preprocessing methods; a processing method corresponding to the maximum prediction correlation coefficient R2 and the minimum root-mean-square error RMSE is used as the optimal preprocessing method, and a near-infrared spectrum correction model is set up through the optimal preprocessing method; the near-infrared spectrum correction model built in the step mentioned above is used for detecting the cotton-seed meal to be detected to obtain the chromium content of the cotton-seed meal. The FOSS5000 near-infrared spectrometer is used for collecting spectrograms of the cotton-seed meal, determination accuracy is high, and the determination method is fast, convenient and efficient and has great significance in cultivating new cotton species and promoting processing and utilization of cotton by-products.

Description

technical field [0001] The invention relates to a method for determining content, in particular to a method for determining the content of chromium in cottonseed powder. Background technique [0002] Near Infrared Spectroscopy (Near Infrared Reflectance Spectroscopy, NIRS) analysis technology is through the hydrogen-containing groups in the analyzed substances such as OH, CH, NH, SH, etc., which have characteristic absorption peaks in the near-infrared region. The scanned sample spectral information is subjected to a series of analysis and processing, and finally the quantitative analysis of the relevant components of the sample is completed. Near-infrared spectrometers can collect characteristic absorption signals of almost all organic substances, but there are no absorption peaks for metal elements, but metal elements in plants do not exist alone, and are often combined or chelated with many active enzymes and other organic substances, enriched in plant tissues , thus bei...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/359
Inventor 祝水金余恩陈进红何秋伶李诚赵茹冰
Owner ZHEJIANG UNIV
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