Dear researcher, you can find this attach file about thesis in title STUDIES TO CHARACTERIZE HEAVY METAL CONTENT AND MIGRATION FROM RECYCLED POYLETHYLENE

http://digitalcommons.calpoly.edu/cgi/viewcontent.cgi?article=2448&context=theses

3% v/v acetic acid in water is 'acid food simulant' for migration testing in EU standard (from what I could remember).

Dear Sir, You can used different determination process depended on the heavy metals types, but almost used the Atomic Absorption system for these purpose.

N.N. Misra

do you have reference