A simple and accurate procedure was developed to preconcentrate and determine zinc in biological matrices. A polyurethane
foam (PUF) minicolumn was used for the Ærst time for on-line preconcentration. This system was applied to preconcentrate
zinc from aqueous solutions which is sorbed as zinc±thiocyanate complex. Then, the complex was eluted by water and zinc
was determined by spectrophotometry using 4-(2-pyridylazo)-resorcinol. The method was validated by the analysis of several
biological certiÆed reference materials. The detection limit was 0.9 ng ml
ˇ
1
and the RSD was 1.2% for 1 min
preconcentration time. Generally, concentration of Fe(III), Al(III), Mo(VI), Ni(II), Mn(II), Cu(II), and Co(II) found in
biological matrices did not interfere. Dynamic ranges of concentration from 20 to 100 ng ml
ˇ
1
(1 min preconcentration time)
and from 5 to 20 ng ml
ˇ
1
(5 min preconcentration time) achieve a sample throughput of 20 and 8 samples per hour and a
preconcentration factor of 8 and 32, respectively
A simple and accurate procedure was developed to preconcentrate and determine zinc in biological matrices. A polyurethanefoam (PUF) minicolumn was used for the Ærst time for on-line preconcentration. This system was applied to preconcentratezinc from aqueous solutions which is sorbed as zinc±thiocyanate complex. Then, the complex was eluted by water and zincwas determined by spectrophotometry using 4-(2-pyridylazo)-resorcinol. The method was validated by the analysis of severalbiological certiÆed reference materials. The detection limit was 0.9 ng mlˇ1and the RSD was 1.2% for 1 minpreconcentration time. Generally, concentration of Fe(III), Al(III), Mo(VI), Ni(II), Mn(II), Cu(II), and Co(II) found inbiological matrices did not interfere. Dynamic ranges of concentration from 20 to 100 ng mlˇ1(1 min preconcentration time)and from 5 to 20 ng mlˇ1(5 min preconcentration time) achieve a sample throughput of 20 and 8 samples per hour and apreconcentration factor of 8 and 32, respectively
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