Actas de congresos
Acid Extraction And Cloud Point Preconcentration As Sample Preparation Strategies For Cobalt Determination In Biological Materials By Thermospray Flame Furnace Atomic Absorption Spectrometry
Registro en:
Microchemical Journal. , v. 82, n. 2, p. 189 - 195, 2006.
0026265X
10.1016/j.microc.2006.01.006
2-s2.0-33644973818
Autor
Donati G.L.
Nascentes C.C.
Nogueira A.R.A.
Arruda M.A.Z.
Nobrega J.A.
Institución
Resumen
A thermospray flame furnace atomic absorption spectrometer (TS-FF-AAS) was employed for Co determination in biological materials. Cobalt presents a high atomization temperature and consequently poor sensitivity is obtained without changing its thermochemical behavior. The effect of different complexing agents on sensitivity was evaluated based on the formation of Co volatile compounds. A cloud point procedure was optimized for Co preconcentration for further improvement of sensitivity. Samples were treated with 1 mol l- 1 hydrochloric acid solution for quantitative extraction of Co without simultaneous extraction of Fe, since it is a strong interferent. After the extraction and preconcentration steps, a sample volume of 150 μl was introduced into the hot Ni tube using air as carrier at a flow-rate of 0.4 ml min- 1. The best sensitivity was attained using ammonium pyrrolidinedithiocarbamate (APDC) and Triton X-114 was employed for implementation of the cloud point procedure. The detection limit obtained for Co was 2.1 μg l- 1 and the standard deviation was 5.8% for a solution containing 100 μg l- 1 (n = 10). Accuracy was checked using two certified reference materials (tomato leaves and bovine liver) and results were in agreement with certified values at a 95% confidence level. Employing the developed procedure, Co were quantified in different biological materials (plant and animal tissues). The proposed method presents suitable sensitivity for cobalt determination in the quality control of foods. © 2006 Elsevier B.V. All rights reserved. 82 2 189 195 Underwood, E.J., (1977) Trace Elements in Human and Animal Nutrition, , 4th ed. Academic Press New York Belitz, H.D., Grosch, W., (1987) Food Chemistry, , Springer-Verlag Berlin Atsdr, (2001) Toxicological Profile for Cobalt, , U.S. Department of Health and Human Services Atlanta Evans, E.H., Day, J.A., Price, W.J., Smith, C.M.M., Sutton, K., Tyson, J.F., (2003) J. Anal. At. Spectrom., 18, pp. 808-833 Berndt, H., (1998) Fresenius Z. Anal. Chem., 331, pp. 321-323 Delves, H.T., (1970) Analyst, 95, pp. 431-438 Bradshaw, S., Gascoigne, A.J., Headridge, J.B., (1987) Anal. Chim. Acta, 197, pp. 323-325 Berndt, H., Messerschmidt, J., (1982) Anal. Chim. Acta, 136, pp. 407-441 Gáspár, A., Berndt, H., (2000) Spectrochim. Acta, Part B, 55, pp. 587-597 Davies, J., Berndt, H., (2002) Anal. Chim. Acta, 479, pp. 215-223 Gáspár, A., Széles, E., Berndt, H., (2002) Anal. Bioanal. Chem., 372, pp. 136-140 Pereira-Filho, E.R., Berndt, H., Arruda, M.A.Z., (2002) J. Anal. At. Spectrom., 17, pp. 1308-1315 Nascentes, C.C., Arruda, M.A.Z., Nogueira, R.A., Nóbrega, J.A., (2004) Talanta, 64, pp. 912-917 Tarley, C.R.T., Arruda, M.A.Z., (2004) Anal. Sci., 20, pp. 961-966 Giokas, D.L., Paleologos, E.K., Tzouwara-Karayanni, S.M., Karayannis, M.I., (2001) J. Anal. At. Spectrom., 16, pp. 521-526 Manzoori, J.L., Bivili-Tabrizi, A., (2002) Microchem. J., 72, pp. 1-7 Bezerra, M.A., Arruda, M.A.Z., Ferreira, S.L.C., (2005) Appl. Spectrosc. Rev., 40, pp. 269-299 Miyazawa, M., Pavan, M.A., Bloch, M.F.M., (1984) Commun. Soil Sci. Plant Anal., 15, pp. 141-147 Sebastiani, E., Ohls, K., Riemer, G., (1973) Fresenius Z. Anal. Chem., 264, pp. 105-109 Berndt, H., Jackwerth, E., (1975) Spectrochim. Acta, Part B, 30, pp. 169-177 Manning, D.C., (1975) At. Absorpt. Newsl., 14, pp. 99-102 Paleologos, E.K., Stalikas, C.D., Tzouwara-Karayanni, S.M., Karayannis, M.I., (2001) Anal. Chim. Acta, 436, pp. 49-57 Böyükbayram, A.E., Volkan, M., (2000) Spectrochim. Acta, B, 55, pp. 1071-1078 Lurie, J., (1975) Handbook of Analytical Chemistry, , Mir Publisher Moscow Nascentes, C.C., Arruda, M.A.Z., (2003) Talanta, 61, pp. 759-768 Page, V., Feller, U., (2005) Ann. Bot. (London), 96, pp. 425-434 Wang, H.F., Takematsu, N., Ambe, S., (2000) Appl. Radiat. Isotopes, 52, pp. 803-811 Underwood, E.J., Suttle, N.F., (1999) Cobalt in Mineral Nutrition of Lifestock, , CABI Publishing New York Kawashima, T., Henry, P.R., Ammerman, C.B., Littell, R.C., Price, J., (1997) Nutr. Res., 17, pp. 957-974 Kincaid, R.L., Lefebvre, L.E., Cronrath, J.D., Socha, M.T., Johnson, A.B., (2003) J. Dairy Sci., 86, pp. 1405-1414