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On the occurrence of fibres of calcium sulphate resembling amphibole asbestos in samples taken for the evaluation of airborne asbestos

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      <subfield code="a">The use of the membrane filter method for the assessment of airborne concentrations of asbestos fibres is well established. Sample filters are cleared using a medium such as triacetin and fibres are counted at 400-600 x magnification using a phase contrast microscope</subfield>
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      <subfield code="g">nº 1, March 1978 ; p. 91-93</subfield>
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