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Method for detecting migration of 11 elements in stainless steel food container

A detection method, food container technology, applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve problems such as unsatisfied, set specific release limit, and no standard test method is provided, so as to achieve low detection limit and improve test Efficiency, the effect of saving test time

Inactive Publication Date: 2019-04-12
GUANGZHOU GRG METROLOGY & TEST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the migration of two elements, Mg and Ti, is also mentioned in the technical guidelines, but no specific release limit has been set for them at present
[0005] There are very strict requirements for migration elements in the EU technical guidelines, but no specific standard test methods are provided
And although prior art has the report that adopts inductively coupled plasma mass spectrometry to measure the migration of these six kinds of heavy metals of Pb, Cd, Ni, Cr, As and Mn for stainless steel electric kettle, but its research is aimed at the national standard requirement, can not meet the European Union The technical requirements of the technical guidelines, and currently there is no research on the detection methods for the 11 heavy metals Li, Be, V, Co, Tl, Al, Fe, Zn, Ba, Ag and Mg in stainless steel food containers

Method used

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  • Method for detecting migration of 11 elements in stainless steel food container
  • Method for detecting migration of 11 elements in stainless steel food container
  • Method for detecting migration of 11 elements in stainless steel food container

Examples

Experimental program
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Effect test

Embodiment 1

[0049] The detection method of 11 kinds of element migration in the stainless steel food container of the present invention, described method comprises the following steps:

[0050] 1) Sample pretreatment: Take a representative stainless steel bowl, add 5g / L citric acid simulation solution that has been preheated to 70°C to 2 / 3 of the total volume, then cover it properly to reduce evaporation, and place it in Keep it in a constant temperature electric blast drying oven at 70°C for 2h. After reaching the end of the time, take out an appropriate amount of simulated liquid. If the sample produces precipitation and other phenomena during the soaking test, filter it through a 0.45 μm PTFE microporous membrane and wait for testing.

[0051] 2) Preparation of standard solution: a) single-element standard stock solution: pipette corresponding standard solution respectively, dilute step by step with 5% nitric acid, and prepare corresponding single-element standard stock solution in Tab...

Embodiment 2

[0069] Precision and recovery of embodiment 2 method

[0070] To the negative sample, respectively add low, medium and high 3 levels of concentration for standard addition recovery determination, according to this experimental method, repeat the measurement 3 times for each addition level concentration, the results are shown in Table 6, wherein, the mass spectrum of the level concentration in the negative sample Figure such as Figure 13 shown.

[0071] The standard addition recovery rate and precision (RSD) of table 6 target object

[0072]

[0073] It can be seen from Table 6 that under the three spiked levels, the spiked recoveries are 84.0%-107.9%, and the relative standard deviation (RSD) is 0.1%-8.5%, which shows that the method has high precision and good recovery.

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Abstract

The invention discloses a method for detecting migration of 11 elements in a stainless steel food container, comprising the following steps of: 1) pretreating the sample: adding 5 g / L of the citric acid simulating solution to the stainless steel food container to soaked for a period of time, and taking out the simulating solution for testing; 2) preparing the standard solution; 3) measuring the simulating solution in step 1) and the standard solution in step 2) by inductively coupled plasma mass spectrometry, wherein the measuring condition of the inductively coupled plasma mass spectrometry is: RF power: 1550 W; plasma gas flow rate: 15 L / min; auxiliary gas flow: 1.0L / min; atomizing gas flow rate: 1.03L / min; peristaltic pump speed: 0.10rps; sample introduction speed:0.5rps. The method fordetecting migration of 11 elements in stainless steel food container adopts 5g / L citric acid as a simulating solution to pretreat the sample, and the requirements for the product are more strict. Theinductively coupled plasma mass spectrometry can simultaneously measure 11 elements, thereby greatly improving the measuring efficiency and reducing the reagent dosage and saving test time, thereforesimultaneous measuring of 11 elements can be completed in 3 minutes.

Description

technical field [0001] The invention relates to a detection method for the migration amount of harmful elements in food contact materials, in particular to a detection method for the migration amount of 11 elements in a stainless steel food container. Background technique [0002] According to the EU Rapid Alert System for Food and Feed (RASFF) over the years on the global product notification data in the field of food contact materials, the cases of metal products receiving notifications due to the dissolution of heavy metals are the three reasons for the notification (dissolution of heavy metals, specific migration of formaldehyde and aromatic amine specific migration). In 2017, RASFF reported a total of 118 global product notifications in the field of food contact materials, of which 92 were reported to my country (including Hong Kong, China), accounting for about 78%. Metal products are the most notified, accounting for 30.43% of the total notifications to China. [00...

Claims

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Application Information

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IPC IPC(8): G01N27/62
CPCG01N27/62
Inventor 蔡海明郑晓青王华严洪连
Owner GUANGZHOU GRG METROLOGY & TEST CO LTD
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