Evaluation of new in-facepiece sampling procedures for full and half facepieces

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      <subfield code="a">Precision and bias were determined on five different methods of conducting in-facepiece sampling. The sampling procedures evaluated in the study were: (1) a continuous, low sampling rate, flush on the respirator, mid nose-mouth probing procedure; (2) a continuous, high sampling rate, deep front of mouth probing procedure; (3) a pulsed exhalation, deep front of mouth probing procedure; (4) an exhalation value discharge procedure; and (5) a pulsed inhalation, deep front of mouth, probing procedure</subfield>
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      <subfield code="g">nº 2, April 1993 ; p. 151-166</subfield>
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