sounds like a mispelling of ion spectator...?
i looked it up and apparently 'speciation' is connected to 'species', but thats a biological term.
then again, it seems highly limited in its usage, since nearly all searches turned out with results with the phrase of 'metal-ion speciation' rather than just ion speciation.
cant find a proper definition either.
well it seems a very obscure term, maybe someone can add it to the chemical dictionary after finding it out!