Apparently arsenic poses a problem to people spending time in old
American cemeteries. There is a pdf file of a four page article on this
topic from "Cultural Resource Management" - published by the US
National Park Service - here ...
And a full index of the journal here ...
Sorry about the awful pun in the header!
(PhD student researching the origins of the Glasgow Necropolis).
My 15 minutes of fame: http://news.bbc.co.uk/1/hi/scotland/3253588.stm