As far as Cr is concerned, concentrations
were similar to Al, with the lowest value (0.054 wt.%) found
in Samsung 2002–2006 sample and the highest (0.85 wt.%) in
2002–2006 sample. The abundant metal in all samples was Fe,
with a wide range of concentration values and the highest absolute
value (6.67 wt.%) observed in sample 2007–2011.