Environmental Engineering Reference
In-Depth Information
The presence of Au predominantly in residential areas of lower traffic flow,
especially outside the school, suggests a different origin, perhaps from jewellery
worn by pedestrians. The occurrence of highest Ru and Ir values outside the school
also indicates a different source maybe due to loss from equipment. For example is
Ru used in computer hard drives
[1]
.
Conclusions
This study has shown that Pt, Pd and Rh are significantly above natural background
levels in Hathersage and their concentrations all increase in road dust and gully
waste with increasing traffic flow and in steam sediment samples with proximity to
main roads. This indicates a source from vehicle emissions which is the only major
source of these elements in this small town. There is no marked difference between
precious metal concentrations in samples collected from sites in the winter or sum-
mer but a possible indication that Pd is more mobile and removed from gully waste
in wet weather conditions. Gold, Ru and Ir are more abundant in residential areas
especially outside the school and may be related to the presence of more people
rather than vehicles.
Acknowledgements
We thank the Royal Society who granted funding through the Senior Brian
Mercer Award for 2004. We thank Genalysis and Ultratrace for analysis.
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