Further observations on the short-term retention and clearance of asbestos by rats, using UICC reference samples

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      <subfield code="a">Further observations on the short-term retention and clearance of asbestos by rats, using UICC reference samples</subfield>
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      <subfield code="a">Rats exposed to UICC chrysolite A, amosite and crocidolite at concentrations close to 1,5 and 10 mg/m3 of respirable fibre for a total of 120 h over a 6-week period were killed in five groups at approximately monthly intervals. The asbestos retained in the lungs was estimated by infra-red spectrophotometry after ashing. The results indicated different initial fractional retentions but that the rate of clearance was independent of the type of asbestos and of the concentration during exposure</subfield>
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