Pretty much everything about the "arsenic-based life" claim turned out to be examples of poor scientific lab technique and poor thinking. There is NOT acceptance in the scientific community that arsenic-based life has been found.

http://scienceblogs.com/pharyngula/2010/12/its_not_an_arseni...

http://rrresearch.blogspot.com/2010/12/arsenic-associated-ba...

http://www.wired.com/wiredscience/2010/12/arsenic-life-under...

http://www.slate.com/id/2276919/