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Method for detecting content of trace elements in milk powder on basis of laser-induced breakdown spectroscopy

A technology of laser-induced breakdown and medium and trace elements, which is applied in the directions of measuring devices, thermal excitation analysis, material excitation analysis, etc., can solve the problems of long detection time, complicated detection process, cumbersome pretreatment process, etc., and achieve simple operation and improved The effect of accuracy

Inactive Publication Date: 2018-07-27
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two methods have the disadvantages of cumbersome pretreatment process, complicated detection process, long detection time, and high requirements for laboratories and experimenters.
However, the current large demand for infant milk powder poses challenges to the detection efficiency of traditional methods

Method used

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  • Method for detecting content of trace elements in milk powder on basis of laser-induced breakdown spectroscopy
  • Method for detecting content of trace elements in milk powder on basis of laser-induced breakdown spectroscopy
  • Method for detecting content of trace elements in milk powder on basis of laser-induced breakdown spectroscopy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The embodiment of the present invention provides a method for quantitative detection of trace elements in milk powder, see figure 1 and figure 2 , the method is based on laser-induced breakdown spectroscopy and includes the following steps:

[0035] 101: Make samples to be tested:

[0036] Take 4g of the milk powder sample to be tested, and use a hydraulic tablet press to press the milk powder into a circular tablet with a thickness of 10mm and a diameter of 20mm under a pressure of 300Mpa.

[0037] 102: Establishment of sample spectrum;

[0038] Utilize the laser-induced breakdown spectroscopy system (this spectroscopy system is well known to those skilled in the art, and the embodiment of the present invention will not repeat it) to collect the spectral data of the milk powder compression tablet, wherein the laser wavelength of the laser is 1064nm, and the laser energy It is 100-150mJ; the wavelength response range of the fiber optic spectrometer is 200-880nm, and...

Embodiment 2

[0057] The scheme in embodiment 1 is further introduced below in conjunction with specific examples, see the following description for details:

[0058] 201: Sampling the milk powder sample to be tested, pressing the sample to prepare a sample, and obtaining the milk powder flake sample to be tested;

[0059] Specifically, the milk powder samples to be tested were obtained, and the samples to be tested came from different domestic and foreign famous brands of infant formula milk powder available on the market, a total of 90 samples. Take 4g of each sample to be tested, and use a hydraulic tablet press to press the milk powder into a circular tablet with a thickness of 10mm and a diameter of 20mm under a pressure of 300Mpa. 90 milk powder samples were obtained for tableting.

[0060] 202: Collect LIBS spectral information data of the milk powder sample to be tested;

[0061] Specifically, the spectral information data of the milk powder sample to be tested is collected based ...

Embodiment 3

[0082] figure 2 It is a flow chart of the method for detecting the content of trace elements in milk powder based on laser-induced breakdown spectroscopy in an embodiment of the present invention. The main steps include: sample preparation, LIBS spectrum collection, interception of relevant element bands, spectral preprocessing using algorithms, and establishment of calibration A model to determine the trace element content of samples with unknown content. The LIBS system mainly includes: lasers, fiber optic spectrometers, optical fibers, and computers.

[0083] image 3 It is a typical spectrogram of milk powder obtained by using laser-induced breakdown spectroscopy in the embodiment of the present invention, including: spectral information from 200nm to 880nm.

[0084] Figure 4 It is the spectrum diagram of potassium element in the specific embodiment of the present invention, and it is the relevant band of potassium element intercepted according to the ASD database.

...

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Abstract

The invention discloses a method for detecting the content of trace elements in milk powder on the basis of laser-induced breakdown spectroscopy. The method comprises the following steps of making a sample to be tested; building original spectrum data of the sample; testing the content of the trace elements of the sample; amplifying the original spectrum data into a wavelet coefficient carrying more time domain or frequency domain information through high density wavelet transform; performing variable screening by using an improved random leapfrog algorithm; thus screening out variables closely relevant to the tested elements to complete the spectrum pretreatment; combing the correction set spectrum data after the treatment with the measured trace element content; building a correction model by using a partial least squares regression method; obtaining the optimum prediction model of the trace element content in the milk powder. The method has the advantages that the defects of requirement of a great number of samples, long detection pretreatment time, complicated experiments and the like of the exiting method in trace element detection can be avoided. The goal of detecting the content of the trace elements in the milk powder in modes of high speed, great quantity and simple operation is achieved.

Description

technical field [0001] The invention relates to the technical field of dairy product detection, in particular to a method for detecting trace element content in milk powder based on laser-induced breakdown spectroscopy. Background technique [0002] As a substitute for breast milk, infant formula milk powder is the only source of nutrition for many infants and young children, so there are strict national standards to control its nutritional composition and content. Trace elements in milk powder, such as potassium, calcium, magnesium, etc., play a vital role in the healthy growth of infants and young children. Therefore, in order to meet the quality and safety supervision requirements of dairy products and ensure the safe use of infant milk powder, the core issue is to accurately detect the types and contents of various nutrients, especially trace elements. The current standard detection methods mainly include flame atomic absorption spectrophotometry (AAS) and inductively c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/71
CPCG01N21/718
Inventor 宗婧陈达黄志轩李奇峰
Owner TIANJIN UNIV
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