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de Moraes SV, Tisott MM, Milcharek CD, et al. 7-amino-4-azaheptyl grafted onto a silica gel as a sorbent for the on-line preconcentration and determination of iron(III) in water samples. Anal Sci. 2005;21(5):573-7doi: 10.2116/analsci.21.573.
de Moraes, S. V., Tisott, M. M., Milcharek, C. D., Brasil, J. L., Costa, T. M., Gallas, M. R., Benvenutti, E. V., & Lima, E. C. (2005). 7-amino-4-azaheptyl grafted onto a silica gel as a sorbent for the on-line preconcentration and determination of iron(III) in water samples. Analytical sciences : the international journal of the Japan Society for Analytical Chemistry, 21(5), 573-7. https://doi.org/10.2116/analsci.21.573
de Moraes, Sandra V M, et al. "7-amino-4-azaheptyl grafted onto a silica gel as a sorbent for the on-line preconcentration and determination of iron(III) in water samples." Analytical sciences : the international journal of the Japan Society for Analytical Chemistry vol. 21,5 (2005): 573-7. doi: https://doi.org/10.2116/analsci.21.573
de Moraes SV, Tisott MM, Milcharek CD, Brasil JL, Costa TM, Gallas MR, Benvenutti EV, Lima EC. 7-amino-4-azaheptyl grafted onto a silica gel as a sorbent for the on-line preconcentration and determination of iron(III) in water samples. Anal Sci. 2005 May;21(5):573-7. doi: 10.2116/analsci.21.573. PMID: 15913151.
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Anal Sci. 2005 May;21(5):573-7. doi: 10.2116/analsci.21.573.

7-amino-4-azaheptyl grafted onto a silica gel as a sorbent for the on-line preconcentration and determination of iron(III) in water samples.

Analytical sciences : the international journal of the Japan Society for Analytical Chemistry

Sandra V M de Moraes, Mateus M Tisott, Caroline D Milcharek, Jorge L Brasil, Tania M H Costa, Márcia R Gallas, Edilson V Benvenutti, Eder C Lima

Affiliations

  1. Colégio Militar de Porto Alegre, Av. José Bonifácio, 363, 90040-130, Porto Alegre, RS, Brazil.

PMID: 15913151 DOI: 10.2116/analsci.21.573

Abstract

A new sorbent was synthesized by anchoring 7-amino-4-azaheptyltrimetoxisilane, freshly prepared, to silica gel, producing 7-amino-4-azaheptyl anchored silica gel (AAHSG). This material was characterized by infrared spectroscopy (IR), elemental analysis (CHN), and nitrogen adsorption-desorption isotherms. Isotherms of the adsorption of Fe3+, Fe2+ and Cu2+ on AAHSG were recorded, which indicated that Fe3+ presents a higher affinity by the sorbent. Therefore, AAHSG was successfully employed as a sorbent in a simple flow system for the preconcentration of Fe3+ in natural water samples, such as, river water, lagoonwater, springwater, stream water, well water and two water reference materials (NIST-SRM 1640, NIST-SRM 1643d). The obtained preconcentration factor was 82.2, and the detection limit achieved was 5.9 ng ml(-1). The recovery of spiked water samples ranged from 95.0 - 103.1%.

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