Application of polyurethane foam for metal pre-concentration in ¯ow injection analysis was done by Jesus et al. [24]. In this work zinc was preconcentrated on PUF minicolumn from thiocyanate solution as zinc±thiocyanate complex. After water elution, zinc was determined spectrophotometricaly using 4-(2-pyridilazo)-resorcinol. The methodology was applied for biological certi®ed reference materials analysis and showed detection limit of 0.9 ng mlÿ1 and the
RSD was 1.2% for 1 min preconcentration time. The amounts of Fe(III), Al(III), Mo(VI), Mn(II), Ni(II), Cu(II) and Co(II) found in biological matrices did not interfere.
Application of polyurethane foam for metal pre-concentration in ¯ow injection analysis was done by Jesus et al. [24]. In this work zinc was preconcentrated on PUF minicolumn from thiocyanate solution as zinc±thiocyanate complex. After water elution, zinc was determined spectrophotometricaly using 4-(2-pyridilazo)-resorcinol. The methodology was applied for biological certi®ed reference materials analysis and showed detection limit of 0.9 ng mlÿ1 and theRSD was 1.2% for 1 min preconcentration time. The amounts of Fe(III), Al(III), Mo(VI), Mn(II), Ni(II), Cu(II) and Co(II) found in biological matrices did not interfere.
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