A new synthesized ternary polymer composite, polystyrene/polyacrylonitrile/polyindole (PSt/PAN/PIN), was
used as an adsorbent. The structure of synthesized composite was supported by FTIR, BET, X-RD, TGA, SEM and
AFM technique. A SPE method with synthesized composite was developed for the preconcentration of chromium,
copper, iron, manganese, lead and zinc ions. The adsorption capacity were found in the range of 37.4–56.7 mg
. Under the best conditions, the preconcentration factor of method was found as 100. Relative standard
deviation was found at ≤ 3.3% (n = 11). The detection limits of analytes were obtained as: 0.9 μg L− 1 for Cr(III),
1.2 μg L− 1 for Cu(II), 2.0 μg L− 1 for Fe(III), 1.4 μg L− 1 for Mn(II), 0.9 μg L− 1 for Pb(II) and 2.0 µg L− 1 for Zn(II).
Firstly, this SPE method was applied to certified reference material, and than coffee, tea, legumes. The trace
metals was analyzed by flame atomic absorption spectrometry.