cassava root husks were turned into a fine powder of controlled particle size (63 –
75 µm). Based on the analysis of FTIR, NMR and elemental analysis it was observed the
existence of some groups alcohol, carboxylic acids and amines and the presence of sulfur,
nitrogen and oxygen also methionine and thiamine, respectively. The material was applied in
solid-phase extraction of Cu(II). The adsorption maximum amount of metal species extracted
from the solution, Ns
, was determined to be ∼0.14 mmol g
-1
. The material was utilized in
preconcentratio experiments, which culminated in an enrichment factor of 41.3-fold. With the
aid of the enrichment factor, experiments were carried out to determine the Cu(II) content in tap
water and natural water. Preconcentratio method was also applied to a certified reference
material (1643e) and the concentration found was 23.03 ± 0.79 g L
-1
, whereas the specified
Cu(II) concentration was 22.7 ± 0.31 g L
-1