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TRANSMISSION ELECTRON MICROSCOPY ASBESTOS IDENTIFICATION & TESTING

TRANSMISSION ELECTRON MICROSCOPY ASBESTOS IDENTIFICATION & TESTING. Transmission Electron microscopy analyses. AIR MONITORING. BULK SAMPLE. Identification & estimating asbestos airborne fibres: Quantitative analyse Atmospheric control with TEM

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TRANSMISSION ELECTRON MICROSCOPY ASBESTOS IDENTIFICATION & TESTING

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  1. TRANSMISSION ELECTRON MICROSCOPY ASBESTOS IDENTIFICATION & TESTING

  2. Transmission Electron microscopy analyses AIR MONITORING BULK SAMPLE • Identification & estimating asbestos airborne fibres: • Quantitative analyse • Atmospheric control with TEM • Para occupational samples, known as static samples • Occupational and regulatory sampling • Identification & Testing: • Qualitative analyse • Control with PLM and/or TEM • Construction & Building, • Road construction, • NOA, • Waste, • Dust.

  3. 9 ASBESTOS LABoratories across France

  4. REQUIREMENTS TO MEET TEM ANALYSE EXPECTATIONS FIABILITY RAPIDITY INNOVATION SIMPLICITY • Mastery of the regulatory context, • High tech and last technologies, • Reliability of results, • Experienced team, • Quality control. • Free dematerialization service to follow the sample, • 9 asbestos laboratories, • 24H, 6 days a week, • Bulk sample collect on site. • R&D dedicated team, • Norms, standards and government workshops participation. • Sample life cycle dematerialization, • Report dematerialization and dedicated engineer support.

  5. SAMPLE JOURNEY 1 Sample reception, tag to follow the process 2 Sample preparation according to its typology 3 Analyse with latest technology according the sample typology 4 Analyse result 5 Final report available on our online platform and send by post mail.

  6. SAMPLE JOURNEY – PLM ANALYSE 1 • PLM ANALYSE • Once received the sample is analysed with stereomicroscope. • If visible fibres are identified (fibrous sample), PLM will be used. This is a low magnification analyse. • The analyst will follow selection criteria : • Morphology • Colour (pleochroism) • Birefringence • Extinction • Crossed polars • Dispersion staining • If any doubts the sample will be analysed on TEM. If not, the report will be validated thanks to the PLM analyse.

  7. SAMPLE JOURNEY - PREPARATION 2 • TEM ANALYSE - SAMPLE PREPARATION • The analyst will choose one of those chemical preparations below regarding the sample typology: • Chemical attack preparation • Crushing preparation • One of those methods is the crushing into a chemical solvant. • The chemical solution is dropped on a carbon layer predisposed on 3mm layer of copper. 3mm layer of cooper

  8. SAMPLE JOURNEY – TEM ANALYSE 3 • TEM ANALYSE • Sample analysis with the Transmission Electron Microscopy (TEM) • Non-fibrous sample are analysed with the TEM. A non-fibrous sample is defined as a sample with non visible fibres to the naked eye or even to the stereomicroscope.

  9. SAMPLE JOURNEY – TEM ANALYSE 3 • TEM ANALYSE • Sample analysis with the Transmission Electron Microscopy (TEM) • A low magnification quality assessment is performed to ensure the sample uniformity and quality. • Then the analyse start at 10 000x magnification. • The analyst looks for two morphologies: « Flexible hair » shape matching with chrysotile and « rude stick » shape for the amphibole.

  10. SAMPLE JOURNEY – TEM ANALYSE 3 • TEM ANALYSE • Sample analysis with the Transmission Electron Microscopy (TEM) • The analyst make its decision depending on three final criteria: • Morphology : The analyst looks deep into the sample and investigates all fibrous shapes with the length to width ration of 3 to 1. • Crystalline structure: Define with convergent beam electron diffraction technique. • Chemical composition: An X-Ray spectroscopy is used for element characterization. Comparison of the specimen's spectrum with the spectra of asbestos known compositions produce qualitative result. • The analyse report result by asbestos presence or absence.

  11. National Research and Safety Institute The French method for estimating airborne asbestos fibres uses TEM analysis since the 1st July 2012. The French National Research and Safety Institute (INRS) study* – released in 2016 – endorse the regulation:

  12. AIR MONITORING – CASE STUDY (INRS 2016) Comparison between PLM and TEM analyses on asbestos plaster & paint works (representative sample size): • PLM analyse underestimates the exposure level and could lead to a wrong PPE choice. • Rations differ regarding materials. Comparison between PLM and TEM analyses on asbestos road and ground works (representative sample size): * TEM bulk sample analyses concluded ‘asbestos absence’ • The ration is reversed concerning WHO fibres. • PLM analyse could overestimate the exposure level in some instances as there is no fibre characterization. • Only TEM differentiates asbestos fibres from other similar structures.

  13. CONTACT Adrien MICHEL adrien.michel@itgagroup.com www.itgagroup.com

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