Assessment of respirable fibres from soils
Current analytical methods focus on the quantification of all asbestos fibres and asbestos containing material (ACM) within a soil sample, but this does not always give a clear indication of the risk that the asbestos may represent outside of the laboratory testing environment.
Here at i2 we are looking to provide the next level of analytical testing to help you make informed decisions and assessment on the risks and how to control or manage your site.
The Next Step in Risk Assessment
Asbestos in soil can be found in a number of forms, bound either in
Asbestos Containing Material (ACM), as free fibres or fibre bundles.
A standard quantification can tell you the proportional mass of your
soil which is asbestos, but it only goes so far in allowing you to judge
what kind of a risk that represents. A piece of undamaged cement
may give a higher percentage by mass of asbestos, but a smaller
percentage of free fibres may present a much higher risk. The next
step for testing and assessment is to look at fibre release – how
much of that asbestos is actually likely to be released to the air?
Adapting from existing methodology (EN 15051-2:2013 – Workplace
exposure – Measurement of the dustiness of bulk material), our
method looks at the dust that would be released under natural
site conditions. Within that, we are focusing on the respirable fibres
(fibres with a diameter of less than 3μm, length of at least 5μm
and an aspect ratio (length to width) of greater than 3) which will
penetrate beyond the terminal bronchioles into the gas exchange
region of the lungs as these represent the significant risk to human
Utilising the Latest Methodology
A representative subsample of soil is rotated for a fixed period inside a sealed metal drum as a constant flow of air is passed through the apparatus. The dust generated is blown through a foam filter to remove larger dust fractions. The fibres are then caught on a nitro-cellulose filter which is subjected to fibre counting methodology using Phase Contrast Optical Microscopy (PCOM) as per HSG248.
The number of fibres identified gives us a respirable fibre concentration in fibres/ml of air. Using the concentration of dust collected (mg/m3) we can correct the fibres/ml air concentration to that at a normalized dust concentration. This allows for better determination of the risks posed by asbestos on site.
Used in conjunction with the Identification and Soil Quantification tests this will give you a much more complete picture of how the asbestos is distributed on your site, what risk it may represent and how best to move forward. With competitive rates, including discounts on larger submissions and options for rapid delivery (3 and 5 working days) we can help give you a cost effective solution to managing asbestos on site.
If you require any further information or would like to discuss any element of our Asbestos testing capabilities please contact Dr Claire Stone or
Will Fardon at email@example.com
For more information please contact:-
If you require any further information or would
like to discuss any element of our Asbestos
testing capabilities please contact
Dr Claire Stone or Will Fardon at