Artículos de revistas
Evaluation Of Poly(vinylpyridine)-supported Protoporphyrin Resin For The Sampling/separation Of Manganese(ii) Using A Hyphenated Fia-faas System
Registro en:
Analytical Methods. , v. 5, n. 13, p. 3264 - 3271, 2013.
17599660
10.1039/c3ay40232k
2-s2.0-84889646431
Autor
De Oliveira T.F.
De Oliveira F.M.
Segatelli M.G.
Tarley C.R.T.
Institución
Resumen
The present study describes the development of a preconcentration method for manganese determination by FAAS using poly(protoporphyrin-co-vinylpyridine) as a sorbent. To synthesize this material, 4-vinylpyridine and protoporphyrin were copolymerized in the presence of ethylene glycol dimethacrylate as a cross-linker and 2,2-azobisisobutyronitrile as an initiator. The factors affecting the flow injection preconcentration system were optimized by employing 25 fractional factorial and Doehlert matrix designs. The proposed on-line preconcentration method was performed by percolating 18.0 mL aliquots of Mn(ii) solutions (pH 8.3) at a flow rate of 6.0 mL min-1 through a mini-column, packed with 100 mg of poly(protoporphyrin-co-vinylpyridine); the Mn(ii) ions were then on-line eluted with 1.5 mol L-1 HNO3 into the FAAS nebulizer. Under these conditions, it was possible to yield a linear curve in the concentration range of 0.0-120.0 μg L-1, with a correlation coefficient of 0.997. 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