Quality Control In Potentiometric Determination Of Acid Volatile Sulfides (avs) Using Standard Addition [controle Da Qualidade Na Determinação Potenciométrica De Sulfetos Volatilizáveis Por Acidificação (sva) Utilizando Adições De Padrão]

This paper presents a quality assurance and quality control protocol in order to ensure the reliability of analytical results for the determination of acid volatile sulfides in environmental samples by potentiometry. The monitoring of the ion selective sensor readings must be realized continually and particularly in this situation where the analyte is susceptible to transformation and volatilization. Potentiometry with the standard addition was presented as a rapid, accurate, precise, feasible as well as a low cost technique. Concentrations of the analyte in the range of 0.49 to 1.02 mg L -1 were tested with percentage recoveries varying from 89 to 113%.354832836Araújo, R.P.A., Botta-Paschoal, C.M.R., Silvério, P.F., Almeida, F.V., Rodrigues, P.F., Umbuzeiro, G.A., Jardim, W.F., Mozeto, A.A., (2006) Environ. Toxicol. Chem., 25, p. 581(2005) Procedures for the Derivation of Equilibrium Partitioning Sediment Benchmarks (ESBs) for the Protection of Benthic Organisms: Metal Mixtures (cadmium Copper, Lead Nickel, Silver, and Zinc), , USEPA - United States Environmental Protection Agency EPA-600-R-02-011, Office of Research and Development: Washington DCScheffer, E.W., Sodré, F.F., Grassi, M.T., (2007) Quim. Nova, 30, p. 332Marcussen, H., Dalsgaard, A., Holm, P.E., (2008) Environ. Pollut., 155, p. 41Mozeto, A.A., Umbuzeiro, G.A., Jardim, W.F., (2006) Métodos de Coleta, Análises Físico-químicas e Ensaios Biológicos e Ecotoxicológicos de Sedimentos de Água Doce, , 1 a ed., Cubo Multimídia: São CarlosJardim, G.M., Armas, E.D., Monteiro, R.T.R., (2008) Braz. J. Biol., 68, p. 51Cooper, D.C., Morse, J.W., (1999) Aquat. Geochem., 5, p. 87Morse, J.W., Luther III, G.W., (1999) Geochim. Cosmochim. Acta, 63, p. 3373Bell, R.A., Kramer, J.R., (1999) Environ. Toxicol. Chem., 18, p. 9Chen, S.-Y., Lin, J.-G., (2009) J. Hazard. Mater., 161, p. 893He, P.-J., Xiao, Z., Shao, L.-M., Yu, J.-Y., Lee, D.-J., (2006) J. Hazard. Mater., B137, p. 1385Oikawa, K., Mitsui, H., Ohtani, H., Ishida, K., (2000) ISIJ Int., 40, p. 182Ryan, M.P., Williams, D.E., Chater, R.J., Hutton, B.M., Mcphail, D.S., (2002) Nature, 415, p. 770Pan, T.J., Gesmundo, F., Niu, Y., (2007) Corros. Sci., 49, p. 1362Besser, J.M., Brumbaugh, W.G., Kemble, N.E., May, T.W., Ingersoll, C.G., (2004) Environ. Sci. Technol., 38, p. 6210Graham, A.M., Wadhawan, A.R., Bouwer, E.J., (2009) Environ. Toxicol. Chem., 28, p. 471Allen, H.E., Fu, G., Deng, B., (1993) Environ. Toxicol. Chem., 12, p. 1441Peterson, G.S., Ankley, G.T., Leonard, E.N., (1996) Environ. Toxicol. Chem., 15, p. 2147Gonzalez, A.M., (2002) Environ. Toxicol. Chem., 21, p. 980Nizoli, E.C., Luiz-Silva, W., (2009) Quim. Nova, 32, p. 365Rearick, M.S., Gilmour, C.C., Heyes, A., Mason, R.P., (2005) Environ. Toxicol. Chem., 24, p. 3043Echols, K.R., Brumbaugh, W.G., Orazio, C.E., May, T.W., Poulton, B.C., Peterman, P.H., (2008) Arch. Environ. Contam. Toxicol., 55, p. 161Silvério, P.F., Fonseca, A.L., Botta-Paschoal, C.M.R., Mozeto, A.A., (2005) Aquat. Ecosyst. Health Manage., 8, p. 313http://www.coleparmer.com/catalog/manual_pdfs/AGSManual0208.pdf, acessada em Agosto 2011Fagnani, E., Guimarães, J.R., Mozeto, A.A., Fadini, P.S., (2011) Quim. Nova, 34, p. 1618Harris, D.C., (2007) Quantitative Chemical Analysis, , 7 th ed., W. H. Freeman Co: New York(1998) Standard Methods for the Examination of Water and Wastewater, , APHA, AWWA, WEF 20 th ed., United Book: BaltimoreDi Toro, D.M., Mahony, J.D., Hansen, D.J., Scott, K.J., Hicks, M.B., Mayr, S.M., Redmond, M.S., (1990) Environ. Toxicol. Chem., 9, p. 1487Schnitzler, D.C., Grassi, M.T., Quinaia, S.P., (2009) Quim. Nova, 32, p. 131