Oh come on! which search engines did you use? TFSE and google, and google groups, have heaps of info on this. Perhaps broaden your search to include the words "Aqua Regia" as well.
The basic rundown is that Pd Metal dissolves in Aqua Regia(3parts Nitric Acid : 1part HCl) with the salt that remains after evaporation being crude PdCl2.