Gain background and practical knowledge in the surveying of buildings for asbestos and general guidance on management procedures necessary to minimise exposure to any identified asbestos.
Airborne fibre determination by phase contrast microscopy
Candidates for this course are expected to be aware of the contents of HSG 248 Asbestos: the analysts' guide for sampling, analysis and clearance procedures, and in particular Appendix 1: Fibres in air: sampling and evaluation of by phase contrast microscopy. Candidates will preferably have prior experience of analysing fibre count samples and may already be participating in a quality control scheme.
To provide candidates with theoretical and practical knowledge in the techniques of fibre counting of asbestos air samples using phase contrast microscopy (PCM).
- Candidates will be able to describe and carry out the approved methods for correctly setting up air sampling equipment and for fibre counting, and have an understanding of the accuracy and limitations of these methods and the requirements for quality control.
1. Setting up of Microscope
- Describe the theory of phase contrast microscopy.
- Use of light microscopy, setting up of Koehler or Koehler type illumination, calibration of stage micrometer and use of test slides.
- Demonstrate and use of the Walton Beckett graticule, stage micrometer and NPL test slide.
- Candidates must be given the opportunity to set up various makes of microscope used in this work as well as to count slides of known quality such as those used in the RICE scheme.
2. Filter Preparation, Fibre Counting and Set Up of Air Sampling Equipment
- Selection and set up of air sampling trains for monitoring of airborne fibre concentrations. Calibration of air sampling trains and minimisation of sampling error.
- Air sampling strategies, e.g. requirements and locations for leak testing, background testing, reassurance sampling and personal monitoring.
- Handling and preparation of filters, and counting of fibres in accordance with the recognised counting rules, i.e. the WHO method as specified in HSG248 (1).
- Discussion of the limitations of the methods together with understanding of accuracy, precision and systematic differences.
3. Calculation of Results, Quality Control, Reporting and Communication
- Calculation of airborne fibre concentrations from fibre count data and comparison of results with appropriate standards.
- Examination of the reliability of results in relation to quality control schemes such as UKAS, RICE and ISO and European Standards for Good Laboratory Practice (GLP).
- Necessity for internal quality schemes, i.e. counting of blank filters and counting audits.
- Describe the requirements for formal reporting of and communication of analytical results.
4. Practical Work
Practical work must be carried out to provide candidates with all practical knowledge in carrying out the following:
- setting up and calibration of air sampling trains,
- air sampling strategies for leak testing, background sampling, reassurance sampling and personal exposure monitoring,
- preparation of microscope slides following sampling,
- microscope set-up and an understanding of the counting rules,
- fibre counting for a range of fibre densities and types.
This is a QA approved partner course
Face-to-face learning in the comfort of our quality nationwide centres, with free refreshments and Wi-Fi.
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