A flow-injection-ICP system sequential multielemental analysis with simultaneously mercury(II) preconcentration step
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Data
2003-01-01
Autores
Zara, L. F.
Rocha, J. C.
Milani, M. R.
Rosa, André Henrique [UNESP]
dos Santos, A.
Serudo, R. L.
Título da Revista
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Título de Volume
Editor
Marcel Dekker Inc
Resumo
A flow-injection system for multielemental analysis with a mercury(II) preconcentration step using a resin Chelite-S(R)(Serva Feinbiochemica Heidelberg, Part No. 41709) packed minicolumn by inductively coupled plasma atomic emission spectroscopy is described. A mercury reductive elution procedure with a mixture of SnCl2/HCl was used, which allows use of 6 mol/L HCl solution instead of concentrated hydrochoric acid. The main parameters related to ICP operation, such as radio frequency power (950-1750 W), auxiliary argon flow (0.0-1.5 L/min) and spray chamber nebulizer pressure (15-35 psi), were studied. Optimization of the FIA system was reached by defining the best eluent carrier stream (1.4-2.8 mL/min), Hgdegrees carrier stream (10-40 mL min(-1)), loading time (0.5-4.0 min), sample flow rate (1.25-10.0 mL/min), temperature of reactor gas liquid separator (GLS) (25-75 degreesC) and eluent volume (50-350 muL). Throughput is around 30 samples per hour for analytical solutions within the range 50-2500 ng Hg(II)/L. Results from certified material showed good precision (RSD < 3%, n = 12) and no statistical difference was observed for real samples analyzed by AAS and by the proposed system.
Descrição
Palavras-chave
multielemental analysis, Chelite (R) S resin, FIA, cold vapor-ICP-AES
Como citar
Analytical Letters. New York: Marcel Dekker Inc., v. 36, n. 4, p. 781-795, 2003.