Petrographic and SEM assessment of naturally occurring asbestos (AS 4964)

Petrographic Assessment and SEM of natural occurring asbestos (NOA) in rocks and soil (AS 4964)

Petrographic testing is an important method for identifying naturally occurring asbestos (NOA) in rocks and soils. This is because NOA can be difficult to detect using other methods, such as visual inspection or bulk sampling. Petrographic testing allows for the examination of thin sections of rock or soil under a microscope, which can reveal the presence of asbestos fibres that may not be visible to the naked eye. Once potential asbestos fibres are observed in thin section the next stage to confirm if the fibres are asbestos or just fibrous mineral habit, a SEM analysis need to be undertake.  

1.    Health and safety: The identification of NOA is crucial for the protection of human health and safety. Asbestos fibres, when inhaled, can cause lung cancer, mesothelioma, and other serious respiratory diseases. Petrographic testing can help identify areas where asbestos fibres are present, and appropriate measures can be taken to prevent exposure.

2.    Environmental Impact: Petrographic testing can also help to assess the environmental impact of NOA. This is important for the protection of wildlife and vegetation, and for the management of water resources.

3.    Risk assessment: Petrographic testing can also be used in risk assessment, which is the process of identifying, evaluating, and managing potential hazards. By identifying the presence of asbestos fibres, petrographic testing can help to determine the potential risks associated with NOA, and appropriate measures can be taken to mitigate them.

4.    Legal compliance: Petrographic testing can also help to ensure compliance with laws and regulations related to asbestos. Many jurisdictions have regulations for the identification and management of NOA, and petrographic testing can help organizations comply with these regulations.

Petrographic testing and SEM analysis re important methods for identifying naturally occurring asbestos in rocks and soils, which can help to protect human health and safety, the environment, and legal compliance.

Micrograph taken in cross polarised light at low magnification, of asbestiform tremolite.