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Abstract
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Silica gel chemically bonded N-propyl kriptofix 21 (SBNPK 21) and N-propyl kriptofix 22 (SBNPK 22) and subsequently
immobilized with palladium nanoparticles (PNP-SBNPK 21 and PNP-SBNPK 22) to produce two new
complexing lipophilic materials. Then these novel sorbents were applied for the enrichment of some metal
ions and their subsequent determination by flame atomic absorption spectroscopy (FAAS). The influences of
the variables including pH, amount of solid phase, sample flow rate, eluent conditions and sample volume on
the metal ion recoveries were investigated. The detection limit of proposed method was in the interval 2.1–2.3
and 1.7–2.8 ng mL?1 for PNP-SBNPK 21 and PNP-SBNPK 22 respectively, while the preconcentration factor
was 80 for two sorbents. The relative standard deviations of recoveries were between 1.23–1.31 and 1.28–1.49
for PNP-SBNPK 21 and PNP-SBNPK 22 respectively. The method has high sorption-preconcentration efficiency
even in the presence of various interfering ions. Due to the reasonable selectivity of proposed method, the relative
standard deviation of recoveries of all understudied metal ions in some complicated matrices was less than
3.0%..
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