How to identify asbestos in talc powder?

How to identify asbestos in talc powder?

A few days ago, the explosion of j&j talc powder powder powder incident, people talk about talc pink change. In fact, modern scientific studies have shown that talc causes cancer because of the presence of asbestos in talc. Asbestos is an internationally recognized carcinogen. Because talc ore often accompanies asbestos in the process of mineralization, products based on talc must remove the asbestos component. In numerous identification, X-ray diffraction method has characteristics of fast, accurate, is widely used to identify the components of asbestos in talc powder, small make up today and everybody study together X-ray diffraction method is how to identify the asbestos talcum powder.

When choosing to scan various kinds of asbestos diffraction peaks and diffraction angles, the three-step scanning method is adopted to avoid the interference of strong diffraction peaks and other phase diffraction peaks of talc. Will make a good sample piece in the rack of X - ray diffractometer, according to the conditions of instrument determination, three segments (table 1) were carried out on the sample piece scanning, get the analytical sample diffraction data and spectra, and comparing with standard atlas, observe whether the amphibole asbestos minerals, the characteristics of the serpentine asbestos minerals 2 theta Angle spectrum peaks appear, according to the Angle of theta position marked the corresponding 2 d value, then the X - ray diffraction data sample and asbestos minerals standard X - ray diffraction data contrast, determine whether the sample contains asbestos minerals, identification of asbestos mineral species in the sample at the same time.

For powdery ore samples, X-ray diffraction analysis can be carried out in sections. The rapid scanning in the first stage mainly identifies the ore types, while the slow scanning in the second and third stages is mainly used to identify the existence of amphibole asbestos minerals and serpentine asbestos minerals. If there is no characteristic diffraction peak of asbestos mineral, it is determined that the sample does not contain asbestos. Further observations with polarizing or electron microscopy are required if a mineral that can form asbestos is detected. If fibrous minerals are observed, the samples are judged to contain asbestos. On the contrary, it can only show that this sample contains the minerals that form asbestos, and these minerals have not crystallized into the harmful material asbestos.

Although X-ray diffraction analysis is fast, it has some disadvantages, such as high cost of instrument, high testing cost and low sensitivity to asbestos composition in complex talc powder. Some new detection techniques, such as infrared and thermal analysis, have been gradually extended to talc enterprises.

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