Contribution of sugar-cane harvesting season to atmospheric contamination by polycyclic aromatic hydrocarbons (PAHs) in Araraquara city,Southeast Brazil |
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Authors: | Sandro José de Andrade Joyce Cristale Flávio Soares Silva Guilherme Julião Zocolo Mary R.R. Marchi |
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Affiliation: | 1. Faculdade de Filosofia, Departamento de Química, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Av Bandeirantes 3900, Ribeirão Preto, SP 14040-901, Brazil;2. Departamento de Ambiente, Centro de Estudos do Ambiente e do Mar, Universidade de Aveiro, Aveiro 3810-193, Portugal;3. Instituto de Química, Universidade do Estado de São Paulo, Araraquara, SP 14800-900, Brazil;1. Pulmonary Division, Heart Institute, University of São Paulo Medical School, São Paulo, Brazil;2. Department of Epidemiology, University of São Paulo Public Health School, São Paulo, Brazil;3. Medical Investigation Laboratory 12 (LIM-12), Division of Nephrology, University of São Paulo Medical School, São Paulo, Brazil;1. Universidad Autónoma Metropolitana-Azcapotzalco, Av. San Pablo 180, Col. Reynosa-Tamaulipas, D.F. 02200, México;2. Instituto Nacional de Ecología y Cambio Climático, 09340 México D.F., México |
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Abstract: | In Brazil, sugar-cane crops are burned to facilitate harvesting, and this causes environmental pollution from the large amounts of smoke and soot that are released into the atmosphere. The smoke and soot contain numerous organic compounds such as PAHs. In this study, PM10 and PAH concentrations in the air of Araraquara (SE Brazil, with around 200,000 inhabitants and surrounded by sugar-cane plantations) were determined during the harvest and non-harvest seasons. The sampling strategy included two campaigns in each season, with 20 samples per season. PM10 was collected using a Hi-vol sampler with Teflon? – coated glass fiber filters. PM10 ranged from 41 to 181 μg m?3 during the harvest season, and from 12 to 47 μg m?3 during the non-harvest season. The mean total concentration of PAHs was 2.5 ng m?3 (non-harvest season) and 11.6 ng m?3 (harvest season). In all sampling periods, the most abundant polycyclic aromatic hydrocarbons were phenanthrene and fluoranthrene, and the least abundant was anthracene. The cluster analysis of the total PAH concentrations for each day of sampling and the corresponding meteorological data suggested that the atmospheric concentration of PAHs was independent of the differences in the weather between the seasons. For both sampling seasons, the statistical treatment (PCA, Varimax rotation and HCA) indicated the presence of vehicle sources (diesel, gasoline, and natural-gas engines); but for the harvest season, the main source was attributed to sugar-cane burning. The data generated by this study indicated the burning of sugar-cane as the main contributor to the high levels of PAHs detected in samples during the sugar-cane harvest season. |
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