Solid phase extraction of trace metals in seawater using morpholine dithiocarbamate-loaded amberlite XAD-4 and determination by ICP-AES

Application of morpholine dithiocarbamate (MDTC) coated Amberlite XAD-4, for preconcentration of Cu(II), Cd(II), Zn(II), Pb(II), Ni(II) and Mn(II) by solid phase extraction and determination by inductively coupled plasma (ICP) atomic emission spectrometry (AES) was studied. The optimum pH values for quantitative sorption of Cu(II), Cd(II), Zn(II), Pb(II), Ni(II), and Mn(II) were 6.5-8.0, 7.0-8.5, 6.0-8.5, 6.5-8.5, 7.5-9.0, and 8.0-8.5, respectively. The metals were desorbed with 2 mol L-1 . The t(1/2) values for sorption of metal ions were 2.6, 2.9, 2.5, 2.6, 3.0, and 3.8 min respectively for Cu(II), Cd(II), Zn(II), Pb(II), Ni(II) and Mn(II). The effect of diverse ions on the determination of the previously named metals was studied. Simultaneous enrichment of the six metals was accomplished, and the method was applied for use in the determination of trace metal ions in seawater samples.