Asbestos Air Monitoring
Quality control measures taken by this laboratory ...
Quality control measures taken by this laboratory for sample preparation and fibre counting follow the protocol described in the NIOSH 7400 Method. For this laboratory, intra and inter-counter variations as well as intra-sample variations have been consistently below the control limits specified by NIOSH.
The reliable quantitation limit of this method, determined from in-house quality control data, is based on a minimum fibre density on the filter of 50 fibres/mm 2 (this represents 40 fibres counted in 100 fields). Below this level, too few fibres are detected to allow meaningful reporting. The quantitation limit in fibres per millilitre of air is directly related to the volume of air sampled. For example, for a sampling volume of 360 litres collected on a 25 mm diameter filter, the quantitation limit would be 0.05 fibres per millilitre of air.
All PCM cassettes submitted to this laboratory for fibre analysis are retained for a minimum of three months. Samples may be retrieved, upon request, at any time during that period.
Preliminary fax results for Regular Turnaround samples are issued in five business days. The results for Rush Turnaround samples are provided within one business day. Written reports follow by mail. The written report consists of a covering letter and a table of results.
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