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Measuring method for nano titanium dioxide migration quantity in food plastic package product

A technology of nano-titanium dioxide and plastic packaging, which is applied in the direction of measuring devices, analyzing materials, and material analysis through electromagnetic means, which can solve the problems of the measurement of nano-titanium dioxide migration and low migration, and achieve the effect of simple measurement methods

Inactive Publication Date: 2016-09-21
NINGBO ACAD OF SCI & TECH FOR INSPECTION & QUARANTINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, none of the above detection methods are suitable for the detection of nano-titanium dioxide in food, and when nano-titanium dioxide in food plastic packaging products migrates to food, there are still problems such as low migration amount and various particle sizes. Determination of Migration of Nano-TiO2 in Plastic Packaging Products Brings Difficulties

Method used

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  • Measuring method for nano titanium dioxide migration quantity in food plastic package product
  • Measuring method for nano titanium dioxide migration quantity in food plastic package product
  • Measuring method for nano titanium dioxide migration quantity in food plastic package product

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: the assay method of nano-titanium dioxide migration in food plastic packaging products

[0021] 1.1 Samples, reagents and instruments used in the test

[0022] The selected food plastic packaging samples are nano-titanium dioxide PP sheets (purchased from Ningbo Jialian Plastic Products Co., Ltd.). In this embodiment, three different nano-titanium dioxide PP sheets are selected for testing, namely sample a, sample b and sample c; Acidic food simulant liquid selects 4% (volume fraction) acetic acid for use, and wherein glacial acetic acid is superior grade pure (purchased in Sinopharm Group); concentrated sulfuric acid is superior grade pure (purchased in Sinopharm Group); ammonium sulfate is analytically pure (purchased in Sinopharm Group); Sinopharm Group).

[0023] The main instruments used in the experiment are as follows: SEM Quanta TM 250 (FEI, USA); inductively coupled plasma mass spectrometer Agilengt 7500A (Agilent, USA); water bath HH-60 (Changz...

Embodiment 2

[0041] Embodiment 2: the mensuration of detection limit and recovery rate

[0042]2.1 Using the above-mentioned measurement conditions, under the same experimental conditions, the titanium concentration of the blank solution was continuously measured 11 times, and the detection limit of titanium was 3 times of the standard deviation, and the detection limit of titanium dioxide was calculated according to formula Ⅰ. The results are shown in Table 2. The above blank solution was prepared by the following steps: 100 mL of 4% (volume fraction) acetic acid solution, evaporated to dryness, added 1.6 g of ammonium sulfate and 4 mL of concentrated sulfuric acid, heated and dissolved on a heating plate until clarified. After cooling, transfer the volume to a 100mL volumetric flask with water, and the resulting solution is the reagent blank solution.

[0043] Table 2 Detection Limits

[0044]

[0045] As can be seen from Table 2, adopt the assay method of invention, its detection l...

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Abstract

The invention relates to a measuring method for nano titanium dioxide migration quantity in a food plastic package product. The measuring method is characterized in that a food plastic package sample is soaked for 10-12 d in acid food simulation liquid at the temperature of 45-50 DEG C; the soaking solution is taken and contains nano titanium dioxide in different particle sizes, ammonium sulfate and concentrated sulfuric acid are added into the soaking solution, heated and dissolved until the solution is clarified to obtain a digestive solution, the solid-to-liquid ratio of ammonium sulfate to the soaking solution is (1.5-2.0):100, and the volume ratio of concentrated sulfuric acid to the soaking solution is (4-6):100; finally, inductive coupling plasma mass-spectrography is used for measuring the concentration C of titanium in the digestive solution, and the titanium dioxide migration quantity is obtained through a formula I. Compared with the prior art, the measuring method is simple, fast, accurate and capable of detecting nano titanium dioxide which is in different particle sizes and is migrated from the food plastic package into food (particularly acid food), the detection limit of the measuring method is 0.15 micrograms / dm<2>, and the recovery rate is 85-95%.

Description

technical field [0001] The invention relates to the field of chemical component detection, in particular to a method for measuring the migration amount of nano-titanium dioxide in food plastic packaging products. Background technique [0002] Filler is a kind of plastic processing aid, which has the functions of reducing cost, improving product performance, and improving appearance. Nano-titanium dioxide is a common filler. It has the characteristics of shielding ultraviolet rays, good thermal stability, and hydrophilicity. It can be used in plastic processing to play anti-aging and sterilizing functions, so it is widely used in food plastic packaging products. However, when this food plastic packaging product is in contact with food for a long time, with the change of contact time and storage environment, the nano-titanium dioxide in the food plastic packaging product will migrate into the food, especially acidic food, which will affect the quality of food and cause biologi...

Claims

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Application Information

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IPC IPC(8): G01N27/62G01N27/626
CPCG01N27/62
Inventor 刘在美曹国洲卢波肖道清朱晓艳刘江
Owner NINGBO ACAD OF SCI & TECH FOR INSPECTION & QUARANTINE
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