Polarized light microscopy-X-ray diffraction method for qualitative detection of asbestos in electronic products

Abstract

The invention relates to a polarized light microscopy-X-ray diffraction method for qualitative detection of asbestos in electronic products. The method combines X-ray diffraction and polarized light microscopy observation. By means of observation of a polarized light microscopy, the optical properties of a sample in oil with different refractive indexes are considered, and the asbestos type is preliminarily identified; compared with the separately used X-ray diffraction method, the polarized light microscopy-X-ray diffraction method enables diffraction observation to be targeted, and is accurate in results and good in reproducibility. The method can be used for accurately identifying the trace amount of asbestos contained in a to-be-tested sample of an electronic product, is suitable for the inspection of the asbestos in the various electronic products, and can effectively avoid asbestos hazard and trade risks of the electronic products.

Description

technical field [0001] The invention relates to the technical field of identification of asbestos materials, in particular to a qualitative detection method for asbestos in electronic products. Background technique [0002] It is generally believed that the fiber is dust with a ratio of aspect ratio > 3:1. Asbestos is fibrous and is a general term for natural fibrous siliceous minerals. It is usually divided into two categories: chrysotile and amphibole. Scientific research shows that asbestos is harmful to the environment and human health. The International Organization for Research on Cancer (IARC) has announced that asbestos is a class A carcinogen. Many multinational companies such as SONY, DELL, Sharp, IBM, etc. have also expressly banned their products or raw materials use of asbestos. The methods currently used to detect asbestos in products mainly include: phase contrast microscopy, polarizing microscopy, scanning electron microscopy analysis, transmission elect...

AI Technical Summary

Problems solved by technology

For the detection of trace asbestos in electronic products, the existing technology is not perfect

X-ray diffraction is based on the proportional relationship between the content of a certain mineral and the intensity of its diffraction peak to judge whether a sample contains a certain asbestos mineral and determine its content. Since serpentine and hornblende minerals themselves have a fibrous structure or non- There are two kinds of fiber structure, serpentine and hornblende with fiber structure are called asbestos, so using X-ray diffraction method alone to accurately identify the trace amount of asbestos contained in the sample of electronic products to be tested is difficult to achieve the desired effect, so In view of the complex composition and structure of asbestos, it is difficult to accurately identify it with a single technique, and the arbitrator method relies too much on expensive instruments and equipment, and its universality is very low

Images