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Fast detection method of heavy metal in children textiles and shoes units

A detection method and textile technology, applied in the field of chemical detection, can solve the problems of inaccurate detection results, difficulty in accurate quantification of heavy metals, and cumbersome operations, and achieve the effects of simplifying sample pretreatment steps, accurate and reliable quantitative analysis, and improving detection efficiency.

Active Publication Date: 2018-12-18
GUANGDONG TESTING INST OF PROD QUALITY SUPERVISION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] When using these methods to detect the heavy metal content in children's textiles, since the standard stipulates that only the printed coating is tested, it is necessary to scrape the printed coating from the textile. Close contact, especially some paste printing coatings are very thin, it is difficult or even impossible to scrape off from the textile, and during the scraping process, textile fibers will also be mixed into the printing coating, making it difficult to determine the quality of the printing coating , which makes it difficult to quantify heavy metals accurately; during digestion, in order to prevent the material from being completely digested, or the extraction of limited substances is insufficient, resulting in inaccurate test results, it is necessary to chop the textile coating and shoe parts into fine particles, and then pass through the microwave Digestion method, dissolving heavy metals in nitric acid solution, filtering and testing on the machine
This process is extremely time-consuming and labor-intensive, the detection efficiency is low, and the detection cost remains high, which greatly limits the development of the detection business; moreover, there is a certain danger in microwave digestion. Will cause waste of resources and environmental pollution

Method used

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  • Fast detection method of heavy metal in children textiles and shoes units
  • Fast detection method of heavy metal in children textiles and shoes units
  • Fast detection method of heavy metal in children textiles and shoes units

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] This embodiment provides a rapid detection method for heavy metal content in children's textiles, the specific steps are as follows:

[0039] Step 1. Sample pretreatment

[0040] Take children's clothes with printed coating, take the coated part, first use a mixed solvent of n-hexane and acetone (volume ratio 4:1) to clean the oil stain on the surface, wash off the oil-soluble solvent on the cloth with ethanol, and dry it naturally to obtain the desired Process the samples to be tested.

[0041] Step 2, XPS full-spectrum scanning

[0042] X-ray photoelectron spectroscopy, or XPS. Since the characteristic energy values ​​of photoelectron lines and Auger lines of constituent elements are unique, comparing the results of XPS full-spectrum scanning with the binding energies of XPS standard spectrum manuals and databases can be used to identify the elements contained in the sample.

[0043] The test parameters of XPS full-spectrum scanning are set as follows:

[0044] X-...

Embodiment 2

[0063] This embodiment provides a method for rapid detection of medium and heavy metal content in children's shoes, and the specific steps are as follows:

[0064] Step 1. Sample pretreatment

[0065] Take the parts of children's shoes, cut them with a precision plastic slicer, precisely control the thickness of the sample to be tested, and expose the distribution surface, first clean it with a mixed solvent of n-hexane and propanol (volume ratio 4:1), and then wash it with ethanol. The mixed solvent on the shoe parts was washed off, and air-dried to obtain the pretreated sample to be tested.

[0066] In this embodiment, the sample is preferably cut into a thin layer of material with a thickness of 1 mm.

[0067] Step 2-3, XPS full spectrum scan, XPS narrow spectrum scan

[0068] The steps are basically the same as in Example 1.

[0069] From the full-spectrum scanning results, compared with the XPS standard spectrum database, it can be seen that sample 2 contains heavy met...

Embodiment 3

[0085] In this example, according to GB / T 27417-2017 "Guidelines for the Confirmation and Verification of Chemical Analysis Methods for Conformity Assessment", a rapid detection method for heavy metal content in children's textiles and shoe parts provided by the present invention is verified.

[0086] Step 1. Preparation of standard samples

[0087] The heavy metal (lead, cadmium, arsenic) content of 0.01g ~ 9g of solid powder is fully ground and mixed with 10kg of PVC powder, heated and melted, pressed into a sheet structure with a thickness of 0.8 ~ 1.5mm, and the heavy metal (lead , cadmium, arsenic) content of 1mg / kg, 2mg / kg, 3mg / kg, 4mg / kg, 5mg / kg, 10mg / kg, 50mg / kg, 90mg / kg, 100mg / kg, 300mg / kg, 600mg / kg , 900mg / kg series of standard samples.

[0088] Step 2. Determine the detection limit and precision

[0089] According to the methods in 5.4.2.2 and 5.6 of GB / T 27417-2017 "Guidelines for Confirmation and Verification of Chemical Analysis Methods for Conformity Assessmen...

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Abstract

The invention provides a fast detection method of heavy metal in children textiles and shoes units. The method adopts XPS full-spectral scanning and narrow-spectral scanning, the heavy metal content detection can be performed by cleaning orderly cleaning the children textiles or the shoes units by using the appropriate oil-soluble organic solvent and water-soluble organic solvent and then drying the same, the sample pre-treatment step is greatly simplified, the detection efficiency is greatly improved, the detection time and the detection cost are saved.

Description

technical field [0001] The invention relates to the field of chemical detection, in particular to a rapid detection method for heavy metals in children's textiles and shoe parts. Background technique [0002] Among the 83 metal elements, metals with a specific gravity greater than 5 are called heavy metals, and there are about 45 of them. Among the widely recognized concepts, heavy metals mainly refer to heavy elements with significant biological toxicity such as mercury (mercury), cadmium, lead, chromium, and metalloid arsenic. After these heavy metals enter the human body, they will cause huge poisonous effects on the human body, especially lead, cadmium and arsenic. After lead enters the human body, it will hinder the synthesis of blood, leading to anemia in the human body, or invade the human brain nerves through the blood, causing brain tissue damage, or passing through the placenta, affecting fetal development, etc.; the biological half-life of cadmium in the human bo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/2273
CPCG01N23/2273
Inventor 胡勇杰胡敏专韩健健
Owner GUANGDONG TESTING INST OF PROD QUALITY SUPERVISION
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