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Salen impregnated silica gel as a new sorbent for on-line preconcentration of cadmium(II)

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A new sorbent - salen impregnated silica gel - was prepared and characterised for application as a minicolumn packing for flow-injection on-line preconcentration of cadmium(II). The system was coupled with flame atomic absorption spectrometer (FI-FAAS). The optimal pH for Cd(II) sorption was in the range of 7.4-8.8 and nitric acid (1%, v/v) was efficient as eluent. Sorption was most effective within the sample flow rate up to 7 mL min-1. Sorption capacity of the sorbent found in a batch procedure was 26.3 µmol g-1 (2.95 mg g-1). Enrichment factor (EF) and limit of detection (LOD) obtained for 120-second loading time were 113 and 0.26 µg L-1, respectively. The sorbent stability in the working conditions was proved for at least 100 preconcentration cycles. The evaluated method was applied to Cd(II) determination in various water samples.
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Keywords: cadmium(II); flow-injection flame atomic absorption spectrometry (FI-FAAS); on-line preconcentration; salen impregnated silica gel

Document Type: Research Article

Affiliations: 1: Department of Analytical Chemistry, Faculty of Chemistry, Jagiellonian University, 30-060 Krakow, Poland 2: Department of Organic Chemistry, Faculty of Chemistry, Jagiellonian University, 30-060 Krakow, Poland

Publication date: April 1, 2011

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