Wagner de Souza Pereira 1,2, Alphonse Kelecom 3, M.V.B. Macedo 2, R.S. Araujo 2 and J.M. Fabbri 2 3 rd International Conference on Po and Radioactive Pb.

Apresentação em tema: "Wagner de Souza Pereira 1,2, Alphonse Kelecom 3, M.V.B. Macedo 2, R.S. Araujo 2 and J.M. Fabbri 2 3 rd International Conference on Po and Radioactive Pb."— Transcrição da apresentação:

1 Wagner de Souza Pereira 1,2, Alphonse Kelecom 3, M.V.B. Macedo 2, R.S. Araujo 2 and J.M. Fabbri 2 3 rd International Conference on Po and Radioactive Pb Isotopes 11-14 October 2015 - Kusadası / TURKEY 1. Coordinating Group for Radiological Protection - INB 2. Laboratory of Wastewater Monitoring - UVA 3. Laboratory of Radiobiology and Radiometry - UFF LEAD-210 ASSESSMENT IN SOLUBLE AND PARTICULATE FRACTIONS OF SURFACE WATER FROM A HIGH BACKGROUND REGION IN BRAZIL

2 Introduction State of Ceará 148,920 km 2 (England+Wales) Municipality of Santa Quitéria Brazilian semi-arid northeast

3 It is a semi-arid region where water management in quantity and quality (potability) is a vital variable for the local population. This area is considered as Naturally Occurring Radioactive Material (NORM) area. 9 million tons of P 2 O 5 and 79.500 tons of U 3 O 8 The study area

4 Preliminary mining investigations

5 Constraints Following Brazilian law, areas with ore reserves associated with uranium and thorium (NORM areas) need to be investigated aiming a: radioecology evaluation and radiological environmental impact assessment based on an environmental radiological monitoring program.

6 Objective Considering that local populations use surface waters without any treatment for all kinds of uses, This study aims to evaluate the activity concentrations (AC) of 210 Pb in surface waters of the Santa Quitéria region; statistical analytical tools with univariate and multivariate approaches were used.tools

7 Material & Methods Surface water samples (1L) were collected at six points (01SQ-06SQ) During 17 month Acidified with 1mL HNO 3 Filtered on an acetate filter (0.45  m) – Filtrate → soluble fraction – Retained material → particulate fraction 210 Pb AC were determined in all these fractions

8 Results : Descriptive statistics AC in Bq L -1 ; Stand. Dev. = standard deviation, Sol. = Soluble; Part. = Particulate; N = number of samples per point

9 Results : univariate analysis Z test concludes: all fractions are similar, when compared all together. ANOVA: there are differences between the fractions, although it does not indicated which are different and which are equal. This assumption is corroborated by Fisher’s test, which identified different groups ranked according to sample activity concentrations.

10 Results: Fisher test Higher concentrations Lower concentrations The particulate fractions showed higher activity concentrations of 210 Pb than the soluble fractions.

11 Results: PCA The principal component analysis (PCA) showed a clear distinction between the soluble and particulate fractions

12 Results: Cluster different behaviors are observed between soluble and particulate fractions

13 Conclusions The radioecology of 210 Pb in the Santa Quitéria area is complex. There are differences in the activity concentrations of 210 Pb: – between the sampling points. – between the soluble and particulate phases with AC particulate > AC soluble Local populations should use filtered water in order to eliminate all solid suspension and thus reduce residual AC of 210 Pb.

14 REFERENCES Ferreira, D. F., 2008. Estatística Multivariada. Editora da UFLA, Lavras, p. 650 p. Godoy, J.M., Lauria, D.C., Godoy, M.L.D.P. and Cunha, R.P., 1994. Development of a Sequential Method for Determination of 238 U, 234 U, 232 Th, 230 Th, 228 Th, 228 Ra, 226 Ra and 210 Pb in Environmental Samples. Journal of Radio-Analytical Nuclear Chemistry, 182 (No. 1): 165-169. Gotelli, NJ and Ellison, AM. 2004. A Primer of Ecological Statistic. Sinauer Associates, Sunderland, 510. National Commission for Nuclear Energy - CNEN, 2014. Standard CNEN-NN-4.01, Requisitos de Segurança e Proteção Radiológica para Instalações Mínero-Industriais, p. 19. 2014a. Standard CNEN-NN-3.01, Diretrizes Básicas de Proteção Radiológica, p. 34. 2011. Standard Posição Regulatória 3.01/008:2011 Programa de Monitoração Radiológica Ambiental, p. 5. 2011a. Standard Posição Regulatória 3.01/009:2011 Modelo para Elaboração de Relatórios de Programa de Monitoração Radiológica Ambiental, p. 5. Pereira, W. S., Kelecom, A. and Py Júnior, Delcy de Azevedo. 2007. Absorbed Dose Rate Due to Intake of Natural Radionuclides by Tilapia Fish (Tilapia nilotica, Linnaeus, 1758) Estimated near Uranium Anomaly at Santa Quitéria, Ceará, Brazil. In: International Nuclear Atlantic Conference - INAC 2007, 2008, Santos. Annals International Nuclear Atlantic Conference - INAC 2007, v.1. p.1 - 6 Pereira, W. S., Kelecom, A. and Py Júnior, D. A., 2008. Absorbed Dose Rate Due to Intake of Natural Radionuclides by Tilapia Fish (Tilapia nilotica, Linnaeus, 1758) Estimated near Uranium mining at Caetité, Bahia, Brazil. AIP Conf. Proc. 1034, 939. http://dx.doi.org/10.1063/1.2991252. Pereira, W. S., Kelecom, A., Py Júnior, Delcy de Azevedo and Mendes, L.M.D. 2010. Estimativa de Taxa de dose absorvida no peixe tilapia (Tilapia nilotica, Linnaeus, 1758) devido à incorporação de radionuclídeos naturais próximo a uma anomalia uranífera em Santa Quitéria, Ceará, Brasil. Mundo & Vida (UFF), 11: 31 - 35. Pereira, Wagner de S., Kelecom, A., Pereira, J. R. S. and Py Júnior, Delcy de Azevedo, 2013. Release of Uranium by an Ore Treatment Unit at Caldas, MG, Brazil. Journal of Environmental Protection (Print), 4: 570 – 574. Pereira, W. S., Kelecom, A. and Pereira, J. R. S., 2014. Analysis of Radium Isotopes in Surface Waters nearby a Phosphate Mining with NORM at Santa Quitéria, Brazil. Journal of Environmental Protection (Online), 5: 193 - 199. Silva, J.R., 2003. Caracterização Hidrogeológica da Jazida de Itataia, M.Sc. Dissertation, Fed. Univ. of Ceará, Brazil, p. 126. Valentin, J.L., 2000. Ecologia Numérica. Uma Introdução à Análise Multivariada de Dados Ecológicos, Interciência, Rio de Janeiro, p. 117.

15 Obrigado Thank You

16 Satistics Univariate statistics – A descriptive statistics. – One-tailed Z test – Analysis Of VAriance (ANOVA) with Fisher test Multivariate statistic – the Principal Component Analysis (PCA) – Cluster Analysis.