Sample Analysis by CES
IANZ Accrediation Number 636.
CES is IANZ accredited for identification of asbestos in bulk samples. We use a combination of gravimetric reduction (refer Australian Standard AS4946 Method for the Qualitative Identification of Asbestos in Bulk samples) and polarised light microscopy (PLM) on the majority of samples.
We have tried several methods for collecting samples including surface dust and in our experience the ghost wipes are the most effective method of collecting settled dust from a surface to determine the presence of asbestos. Ghost wipes are manufactured in the United States and provided in individually sealed packages reducing contamination issues.
Once the sample has been collected, being wiped over the entire surface or a large representative area, the wipe with the collected dust is ashed at 400°C. This ashing process removes other fibre types that may be present and any organic material, and the ghost wipe fabric reduces to a trace amount. The remaining ashed sample is then prepared for analysis by polarised light microscopy.
Fibre Counts - MFM and SEM
When carrying out air monitoring calibrated air pumps draw a known quantity of air over a known period of time over a Membrane or Scanning Electron Microscope (SEM) filter. The filter traps air-borne fibres, which can then be returned to laboratory or our mobile vans, prepared and counted under a phase contrast microscope. The number of fibres on the filter and the volume of air drawn provides for a concentration to be determined. The concentration determines whether an area is clear or safe to occupy. CES fibre counting and air sampling is IANZ accredited.