Asbestos Analysis
Current asbestos fibre identification in environmental and demolition site samples requires polarised light microscopy (PLM) or transmission electron microscopy (TEM) - methods that are time-consuming, require specialised laboratory facilities, and can take days to return results. This turnaround time creates operational risk on active demolition or remediation sites where work must pause pending analysis. NIR spectroscopy can identify the characteristic mineral crystalline structures of the three regulated asbestos fibre types - Chrysotile, Amosite, and Crocidolite - in minutes from prepared field samples.
Findings
What We've Established
Mineral Fibre NIR Signatures
Each asbestos fibre type produces a distinct NIR absorption pattern driven by its silicate structure and hydroxyl coordination: Chrysotile (serpentine group) shows characteristic Mg–OH absorption at 7,235 cm⁻¹; Amosite and Crocidolite (amphibole group) show distinct iron-hydroxyl bands. These signatures are separable from common non-asbestos fibrous minerals (wollastonite, gypsum) that frequently co-occur in building materials.
Regulatory Context
The Sri Lanka National Environmental Act and construction sector guidelines require asbestos identification in demolition waste streams. The absence of rapid on-site screening tools means compliance monitoring is largely reactive. A NIR screening device would enable proactive site monitoring with documented, date-stamped scan records.
Methodology
Technical Approach
Classification model approach - distinguishing the three regulated asbestos types plus common co-occurring minerals and asbestos-free fibrous materials. Reference samples from a certified asbestos analytical laboratory are required for calibration. Sample preparation protocol for field soil and building material matrices is under development with the prospective industrial partner.
Status
Where We Stand
A formal proposal covering technical approach, sample requirements, timeline, and pricing has been submitted to the industrial partner. The proposal is under partner review.
Roadmap
Next Steps
Obtain proposal confirmation and access to reference fibre standards
Design a field sample preparation protocol compatible with NIR scanning
Validate classification performance against PLM reference method on a held-out set
Explore regulatory pathway for NIR results to be accepted as part of official site monitoring documentation
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Interested in This Research?
If you have relevant data, domain expertise, or a measurement problem in this area, we're open to research collaboration and data-sharing agreements.