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Abstract
A method for the assessment of the mutagenic activity of vehicle engine exhaust in the Ames assay is described in which the bacterial strains used (TA98 and TA98/DNP) are exposed to the freshly produced engine exhaust using a ‘Cassella’ slit sampler. The method is found to be effective both in the presence and absence of metabolic activation, using Aroclor-1254-induced rat liver S9 fractions. A comparison is made between the direct exposure method and the standard methods involving the collection of particulate samples on glass fibre filters and the testing of various extracts of these samples. Possible uses of the direct exposure testing method are suggested and the effect of sampling techniques on the results obtained in the Ames assay is also discussed.
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