The mean values of heavy metal concentrations regarding LCDs
are shown in Table 4. The mean values varied as follow: from
18.20 ppm in 2002–2006 to 103.80 ppm in iPhone, regarding Cr;
43.40 ppm to 277.74 ppm for Ni; 53.32 ppm to 191.85 ppm concerning
Zn; 0.14 ppm to 2.13 ppm for Hg; and 4.18 ppm to
33.96 ppm for Pb. Cd was found in only one LCD of a mobile phone,
while in the rest samples it was below detection limit