Directly Attached Acetylacetone to Polyurethane Foam as Solid˗Phase Extractor for Determination of Metal Ions in Natural Samples

Abstract

Acetylacetone (AA) was chemically anchored to polyurethane foam (PUF) via azo coupling of the toluidine -NH 2 in PUF and active ˗CH 2 ˗ in AA.The sorbent was used for off˗line solid˗phase extraction (SPE) and flame atomic absorption (FAAS) determination of Cu(II), Zn(II) and Mn(II) in natural samples.The AA˗PUF sorbent was characterized by UV˗VIS, IR, H 1 NMR, elemental and TGA analysis.Optimal experimental conditions were at pH 6, shaking time of 20 min, sample flow rate of 1.0 ml min ˗1 , and desorption by 10 mL from 0.4 mol L ˗1 hydrochloric acid.Limits of detection (LOD) were 0.14, 0.51 and 0.14 µg L ˗1 and precision (RSD %) were 6.3, 5.3 and 3.2% (n = 5), respectively.All metal ions showed an analytical range of 0.3˗20 µg L ˗1 and preconcentration factor of 100.The proposed method has been successfully applied to the determination of these metal ions in real samples (tap water, olive leaves, and fish liver) with recovery of 91.26% Cu, 84.00% Zn and 87.34% Mn and corresponding RSD values less than 10%.