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Title: Aporte atmosférico de nitrogênio inorgânico e orgânico nas proximidades de Maceió (AL): potencial impacto da atividade canavieira
Keywords: Deposição atmosférica;  Impactos atmosféricos;  Maceió;  Atmospheric deposition;  Atmospheric impacts;  Maceió
Issue Date: 29-Apr-2009
Abstract: This work aimed estimate the atmospheric contribution of inorganic and organic nitrogen by bulk deposition in Maceió (AL). The rain water chemistry has been focus of many studies over the past years. However, there are few studies in the Northeast region of Brazil, being this work the first one analyzing the dissolved organic nitrogen (DON) and its main constituent, urea (CO(NH2)2). NOD is an important part of total nitrogen from rainwater, corresponding 91% of all N in this work samples. It s believed that biomass burning and use of nitrogen fertilizers are its main sources, which can be absorbed by microorganisms in the form of CO(NH2)2. Weekly sampling were made from February 2007 to February 2008, in which DIN (NO3 -, NO2 -, NH4 +) and DON were analyzed. The rain water s average pH were 6.1. 4% of total N of the samples were designated as NH4 +, 4%, NO3 - from and 1%, NO2 -. Compared to the wet season, the dry period showed an increase of all species studied, with exception of DON. The difference between periods can be explained by the higher concentration of species due to rain, and biomass burning and increase in vehicles traffic and sewage. This study showed similar results to those found in studies in the Northeast region. With exception of DON, all results were lower than those obtained in studies in the Southeast region. This difference can be explained by winds that blows from the ocean, and less urbanization and geomorphological characteristics of the region. The average flux of N was 15 kg N ha-1 yr-1 while in the wet season this rate was 10.43 kg N ha-1 and in the dry period is was 4 62 kg N ha-1.
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