Detector tubes and prolonged air sampling

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      <subfield code="a">Long-term detector tubes have already been developed for some air contaminants. These are stainlength type tubes with a color indication that is distinct and easy to evaluate. This paper reports requirements for long-term detector tubes; description of some long-term detector tubes and properties of the long-term suction pump</subfield>
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      <subfield code="a">Contaminantes químicos</subfield>
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      <subfield code="g">Vol. 115, nº 4, April 1977 ; p. 59-61</subfield>
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