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Method for quickly measuring content of five rare earth elements in edible packing material

A technology of packaging materials and rare earth elements, which is applied in the field of determination of edible packaging materials, can solve the problems of affecting human health, high test background, and large amount of reagents, so as to simplify the pre-processing and testing process, overcome low sensitivity, and save testing. cost effect

Inactive Publication Date: 2016-05-25
新疆出入境检验检疫局检验检疫技术中心
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AI Technical Summary

Problems solved by technology

Through the technical means of pretreatment—HNO 3 The high-pressure sealed microwave digestion of the system overcomes the disadvantages of cumbersome procedures, large amount of reagents, long digestion time, environmental pollution, and impact on human health, and also overcomes the low sensitivity, high detection limit, and inaccurate analysis of alkaline soil caused by other detection techniques. Due to the technical defects of metal element content, high test background, strong spectral interference, and inability to simultaneously measure the content of multiple elements, etc., a method for the rapid determination of five rare earth elements, La, Ce, Pr, Sm and Nd in edible packaging materials, was established. system to achieve fast, convenient and accurate detection results, and realize sensitive, efficient, fast, simultaneous and accurate detection of the contents of five rare earth elements La, Ce, Pr, Sm and Nd in edible packaging materials

Method used

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  • Method for quickly measuring content of five rare earth elements in edible packing material
  • Method for quickly measuring content of five rare earth elements in edible packing material
  • Method for quickly measuring content of five rare earth elements in edible packing material

Examples

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Effect test

Embodiment 1

[0039] Embodiment one: the mensuration of five kinds of rare earth element contents of La, Ce, Pr, Sm and Nd in edible packaging material

[0040] The method for measuring the content of five rare earth elements La, Ce, Pr, Sm and Nd in edible packaging materials, the specific steps of the method adopted are as follows:

[0041] (1) Accurately weigh 0.5000 g of the uniformly prepared gelatin capsule shell, place it in a polytetrafluoroethylene digestion tank cleaned by acid boiling, add 8 mL of nitric acid, and conduct microwave digestion procedure for heating and digestion.

[0042] The microwave digestion program is as follows: power 1200W, heat up for the first time, raise the temperature to 80°C within 4min, and stay at 80°C for 3min; 100°C, and stay at 100°C for 2 minutes; carry out the third heating, from 100°C to 120°C within 1 minute, and stay at 120°C for 2 minutes; carry out the fourth heating , from 120°C to 180°C within 2 minutes, and stay at 180°C for 15 minutes....

Embodiment 2

[0048] Embodiment two: the preparation of standard solution

[0049] 1. Experimental process

[0050] (1) The standard working solution is obtained by diluting the national standard mother solution of La, Ce, Pr, Nd, Sm elements (National Standard Material Research Center) 1000mg / L step by step, according to the content of La, Ce, Pr, Nd, Sm in the sample, the preparation is different Concentration of the standard working solution, the preparation of La, Ce, Pr, Nd, Sm mixed standard working solution concentration: 1.00, 10.00, 20.00, 50.00μg / L.

[0051] Use ICP-MS to measure and draw a standard curve, and the correlation coefficient of the measurement results must be above 0.999.

[0052] (2) Drawing of standard working curves of La, Ce, Pr, Nd, Sm elements

[0053] Draw the curve with the concentration of the standard solution of each element (in μg / L) as the abscissa and the corresponding absorbance as the ordinate.

[0054] 2. Experimental results

[0055] For the stan...

Embodiment 3

[0058] Embodiment 3: Elimination of Interference

[0059]The incomplete dissociation of the matrix during the sample measurement or the recombination of dissociated elements in the plasma tail flame will form refractory oxide ions or hydroxide ions, which will interfere with the determination, while the interference of oxides and hydroxides of rare earth elements more serious. By tuning the instrument parameters so that the ratio of CeO / Ce is 0.72%, the oxide interference can be basically eliminated. In addition, the matrix effect and interface effect are eliminated by adding an internal standard online. The selected internal standard element is not interfered by isobaric overlapping or polyatomic ions, or interferes with the isotope of the measured element. The content is very little or even none, and the selected internal standard should be close to the mass number of the element to be measured. In is used as the internal standard element to correct the signal drift of the...

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Abstract

The invention discloses a method for quickly measuring content of five rare earth elements in an edible packing material. The method comprises the following steps: performing preliminary heating using power of 1200 W through a high-pressure closed microwave digestion method for an HNO3 system, heating to 80 DEG C within 4 min, and stewing for 3 min; performing secondary heating for 1 min to raise the temperature from 80 DEG C to 100 DEG C, and stewing for 2 min; performing third heating to raise the temperature from 100 DEG C to 120 DEG C within 1 min, and stewing for 2 min; performing fourth heating to raise the temperature from 120 DEG C to 180 DEG C within 2 min, and stewing for 15 min. The shortcomings of complicated program, more reagents, long digestion time, pollution to the environment and influence on the health of a human body are overcome; the technical defects of low sensitivity, high detection limit, high spectral interference and incapability of simultaneously measuring the content of various elements are overcome; therefore, the content of the five rare earth elements can be sensitively, efficiently, quickly, synchronously and accurately detected, and the method has great application value.

Description

field of invention [0001] The invention relates to the technical field of component determination of edible packaging materials, in particular, the invention relates to the technical field of rapid determination of five rare earth element contents of La, Ce, Pr, Sm and Nd in edible packaging materials. Background technique [0002] With the development of packaging technology, edible food packaging materials have been widely used as a green packaging material. Edible food packaging materials refer to packaging that meets the functional requirements of protecting the integrity of food appearance, hygiene, and safety, and is non-polluting to the environment and food. The characteristics of edible packaging materials are light weight, hygienic, non-toxic and tasteless, can be directly attached to food packaging, high quality, fresh and edible. [0003] Rare earth elements are non-essential chemical elements. In modern industry, rare earth elements have become the raw material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/44G01N27/62
CPCG01N1/44G01N27/62
Inventor 刘俊杨忠陈婷婷李刚
Owner 新疆出入境检验检疫局检验检疫技术中心
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