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|Title:||Solid Phase Extraction To On-line Preconcentrate Trace Cadmium Using Chemically Modified Nano-carbon Black With 3-mercaptopropyltrimethoxysilane|
Caroline D.; Nanicuacua
Daniel M.; dos Santos
Walter N. L.; da Silva
Daniel L. F.; Dall'Antonia
Luiz H.; de Oliveira
Fernanda M.; Clausen
Debora N.; Tarley
Cesar R. T.
|Abstract:||Carbon black (CB) grafted with 3-mercaptopropyltrimethoxysilane (3-MPTMS) was used as solid phase extractor for Cd2+ in a flow injection system coupled to flame atomic absorption spectrometry (FAAS). The influence of pH, buffer concentration, preconcentration flow rate and eluent concentration on preconcentration of Cd2+ were investigated by means of chemometric tools. The characterization of the adsorbent chemically modified was performed by Fourier transform infrared, scanning electron microscopy, energy dispersive X-ray spectroscopy, thermogravimetric analysis, Raman spectroscopy and textural analysis. To perform the on-line preconcentration, 20.0 mL of a pH 7.0 Cd2+ solution at a flow rate of 4.0 mL min(-1) was loaded through 30.0 mg of modified CB and then eluted with 1.0 mol L-1 HCl toward the FAAS instrument. The limits of detection and quantification were found to be 0.20 and 0.66 mu g L-1, respectively. Addition and recovery tests carried out in real samples (mineral, tap and saline waters, and cigarette sample) and the analysis of certified reference material (TORT-2, lobster hepatopancreas reference) attested the applicability of proposed method.|
Atomic Absorption Spectrometry
|Editor:||Soc Brasileira Quimica|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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