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Microwave test method for determining content of harmful substances in plastic package material

A technology of plastic packaging and harmful substances, which is applied in the field of microwave testing, can solve the problem of no harmful substances content, etc., and achieve the effect of fast method, high flexibility and rapid determination

Inactive Publication Date: 2012-07-11
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there have been studies on the migration of chemicals in microwave plastic packaging materials to food, there is no report on the application of microwave action to the determination of harmful substances in plastic packaging materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A microwave test method for measuring the UV-P content of an ultraviolet light absorber in a polypropylene film (PP), comprising the following steps:

[0021] (1) Fabrication of test unit

[0022] Customized polypropylene film with a thickness of 50 μm and a UV-P content of 1.5% (w / w). The custom-made polypropylene film was cut into rectangular strip samples with a mass of 0.24 g, soaked in ethanol solution for 30 seconds, washed several times with ultrapure water, and dried in an oven at 40°C. Place the film sample in a borosilicate glass bottle filled with 40mL of 10% ethanol aqueous solution, screw the cap tightly, and seal it, which is the test unit.

[0023] (2) Microwave accelerated extraction test

[0024] Put the above-made test unit into a microwave oven. Considering the boiling temperature of the 10% ethanol aqueous solution, according to the characteristics of the polypropylene film sample and the UV-P characteristics of the ultraviolet light absorber, the...

Embodiment 2

[0037] Microwave test method for determining the content of antioxidant Irganox 1076 in high-density polyethylene film (HDPE), including the following steps:

[0038] (1) Fabrication of test unit

[0039] Customized high-density polyethylene film with a thickness of 50 μm and an antioxidant Irganox 1076 content of 1.25% (w / w). The custom-made high-density polyethylene film was cut into rectangular strip samples with a mass of 0.40 g, soaked in ethanol solution for 30 seconds, washed with ultrapure water several times, and dried in an oven at 40 °C. Place the film sample in a borosilicate glass bottle filled with 40mL of isooctane, tighten the bottle cap, and seal it, which is the test unit.

[0040] (2) Microwave accelerated extraction test

[0041] Put the above-made test unit into a microwave oven. Considering the boiling temperature of isooctane, according to the characteristics of the high-density polyethylene film sample and the characteristics of the antioxidant Irgan...

Embodiment 3

[0054] A microwave test method for determining the content of antioxidant BHT in high-density polyethylene film (HDPE), including the following steps:

[0055] (1) Fabrication of test unit

[0056] Customized high-density polyethylene film with a thickness of 50 μm and an antioxidant BHT content of 1% (w / w). The custom-made high-density polyethylene film was cut into rectangular strip samples with a mass of 0.24 g, soaked in ethanol solution for 30 seconds, washed several times with ultrapure water, and dried in an oven at 40 °C. Place the film sample in a borosilicate glass bottle filled with 40mL of n-hexane (90-120°C), tighten the bottle cap, and seal it, which is the test unit.

[0057] (2) Microwave accelerated extraction test

[0058]Put the above-made test unit into a microwave oven. Considering the boiling temperature of n-hexane (90-120°C), according to the characteristics of the high-density polyethylene film sample and the characteristics of the antioxidant BHT, ...

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Abstract

The invention discloses a microwave test method for determining the content of harmful substances in a plastic package material, which comprises the following steps of cleaning and drying the plastic package material, then jointly placing the plastic package material and extract solvent in a glass bottle, sealing the glass bottle and enabling the glass bottle to serve as a test unit; placing the test unit into a microwave oven, selecting function power and function time of microwave, and then starting a microware function; after a microwave acceleration extracting test is finished, the solvent is concentrated to an appropriate concentration, and determining the content of the harmful substances in the plastic package material through quantifying and nature determination analysis on the harmful substances in extract through a gas chromatograph or a liquid chromatograph. The microwave test method for determining the content of harmful substances in the plastic package material is fast, convenient and short in time duration. After a plastic package material test sample in the test unit is affected by the microwave, the dissolving speed of the harmful substances can be greatly accelerated, and the time duration of the detection can be greatly shortened. The microwave test method for determining the content of harmful substances in the plastic package material is high in flexibility and can fast determine the content of majority types of harmful substances in the plastic package material.

Description

technical field [0001] The invention relates to a microwave test method for measuring the content of harmful substances in plastic packaging materials. Background technique [0002] Food packaging is the pillar industry of my country's packaging industry, accounting for about 70% of the total output value of the entire packaging industry. Plastic film accounts for about 30% of all packaging materials, and if it is included in the semi-rigid packaging materials made of plastic film and paper, it will account for about 70%. Plastic packaging materials contain a large number of small molecule chemical substances, including processing aids, additives, monomers, oligomers, decomposition products, etc. These chemicals will migrate to food when they come into contact with food, which will lead to potential food contamination and damage Consumers pose a food safety threat. Therefore, it is of great significance to carry out the detection of the content of harmful substances in pla...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N30/06
Inventor 王志伟程娟吴宇梅胡长鹰
Owner JINAN UNIVERSITY
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