Sorry but that's quite a different compound, you can use it for blue toning of b&w prints, though!
What you want for C41 is Ammonium Ferric EDTA or Ammonium Ferric PDTA. The latter one is the stronger bleach agent, but the first one will be much easier to obtain. Here is an Indian company selling Ammonium Ferric EDTA that claims they supply the Australian market.
Thanks for the info/links. Just sent off some inquiries.