Rapid detection method for heavy metal contents in children textiles and shoe parts based on XRF technology

A detection method and textile technology, applied in the field of chemical detection, can solve the problems of inaccurate detection results, low detection efficiency, time-consuming and labor-intensive, etc., and achieve the effect of simplifying sample pretreatment steps, saving detection time, and saving detection costs.

Pending Publication Date: 2018-12-18
GUANGDONG TESTING INST OF PROD QUALITY SUPERVISION
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  • Abstract
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  • 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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  • Rapid detection method for heavy metal contents in children textiles and shoe parts based on XRF technology
  • Rapid detection method for heavy metal contents in children textiles and shoe parts based on XRF technology
  • Rapid detection method for heavy metal contents in children textiles and shoe parts based on XRF technology

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Embodiment 1

[0041] This embodiment provides a rapid detection method for heavy metal content in children's textiles, the specific steps are as follows:

[0042] Step 1. Sample pretreatment

[0043] Take the children's clothes with printed coating, take the coated part, first use the 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 let it dry naturally to obtain the desired Process the samples to be tested.

[0044] Step 2, XRF direct scanning

[0045] XRF is X-ray fluorescence spectrometry (X Ray Fluorescence). The XRF parameters described in Table 1 were used to test the samples to be tested.

[0046] Table 1 XRF direct scanning method test conditions

[0047]

[0048] Sampling was repeated 5 times, XRF direct scanning was performed, and the analysis report was as follows Figure 5 As shown, the heavy metal mass fraction detection results are shown in Table 2:

[0049] ...

Embodiment 2

[0066] This embodiment provides a rapid detection method for heavy metal content in children's shoes parts, the process is as follows figure 1 As shown, the specific steps are as follows:

[0067] Step 1. Preparation of standard samples

[0068] The heavy metal (lead, cadmium, arsenic) content of 0.01g ~ 9g solid powder is fully ground and mixed with 10kg PVC powder, after heating and melting, it is 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, A series of standard samples of 900mg / kg.

[0069] Step 2. Sample pretreatment

[0070] Take children's shoe parts and use a precision plastic slicer to cut them. The thickness of the sample to be tested is precisely controlled to be consistent with the thickness of the standard sample. After exposing the distribution surface, clean it with a mixed solvent of n-hexa...

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Abstract

The invention provides a rapid detection method for heavy metal contents in textiles and shoe parts. The method adopts an XRF scanning method, only a proper oil-soluble organic solvent and a water-soluble organic solvent are needed to sequentially clean a child textile or shoe part, and heavy metal content detection can be carried out after drying, so that sample pretreatment steps are greatly simplified, the detection efficiency is greatly improved, and 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 metal content 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 h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/223
CPCG01N23/223
Inventor 胡勇杰胡敏专韩健健
Owner GUANGDONG TESTING INST OF PROD QUALITY SUPERVISION
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