NIOSH Method 7402-asbestos fibers (revision #1) : low-temperature ashing of filter samples

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      <subfield code="a">NIOSH Method 7402-asbestos fibers (revision #1)</subfield>
      <subfield code="b">: low-temperature ashing of filter samples</subfield>
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      <subfield code="a">As a result of experiments involving scanning electron micrograph (SEM) analysis of low-temperature ashed filters Method 7402 was revised to clarify these issues. Because Method 7402 is used to provide the fraction of optically visible asbestos fibers in a sample, the previously recommended low-temperature ashing step may cause an overestimate of the asbestos fraction</subfield>
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      <subfield code="a">American Industrial Hygiene Association journal</subfield>
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      <subfield code="t">American Industrial Hygiene Association journal</subfield>
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      <subfield code="g">Vol. 51, nº 11, November 1990 ; [2] p.</subfield>
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