The accumulation of metal in plant material was
expressed in the unit g of metal per gram of dry matter.
Digestion of samples in this study was performed
according to the AQUA REGIA Standard. Plantûs
samples; (shoots and roots) were decomposed to dry
matter by heating at 60˚C in the oven. After that, about
0.5-1.0 g of the samples were taken and digested with
5ml of nitric acid. The samples were heated up to 40˚C
for an hour, and later the temperature was increased to
160˚C for at least three hours. Next, the samples were
diluted with 15ml of distilled water and were let cool
for about half an hour. Then, the samples were filtered
and analyzed using an atomic absorption spectrophotometer
(AAS). The concentration of metals remained
in the residual solution was analyzed using AAS.