Results for Cd, Hg and As indicate that their presence, either in
samples from cellular phones released in period 2002–2006 or
from those of period 2007–2011, is relatively low. Pb results indicate
that 2 out of 3 samples from period 2002–2006 exceed its concentration
limit (0.1% w/w), set by the RoHS Directive, in contrast
with samples classified at period 2007–2011 where no sample
overcame it (European Commission-RoHS Directive, 2003a; Hester
and Harrison, 2009).