hhmm...well, the LEF article doesn't mention carnosine chelating anything. the pdf file does claim carnosine can chelate as well as EDTA, but doesn't give any real evidence of why they believe it. they reference a study called "miller o'dowd 2000" but i cant find that study anywhere on the web.
carnosine is a great supplement to take, but until i see actual evidence its a mercury chelator i will have to assume it is not.