Rainwater geochemistry inside the Barcarena power station at the mouth of the Tocantins River
Creators: name: Darilena Monteiro Porfírio
name: Lucilena Rebêlo Monteiro
name: Marcondes Lima Da Costa
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: FOS: Chemical sciences
subject: Ecology
subject: FOS: Biological sciences
subject: FOS: Biological sciences
subject: Inorganic Chemistry

description: Most of South America lacks studies on rainwater composition. The present study evaluates rainwater composition and bulk deposition inside Barcarena power station, located at the mouth of the Tocantins River with Amazon River in Brazil. In 2012, 24-h rainwater samples were collected inside the ELETRONORTE power plant (<i>n</i> = 93), and pH, EC, cations and anions were analyzed. In order of abundance, the rainwater ions were Na<sup>+</sup> &gt; Cl<sup>−</sup> &gt; SO<sub>4</sub><sup>−2</sup> &gt; Ca<sup>+2</sup> &gt; K<sup>+</sup> &gt; F<sup>−</sup> &gt; Mg<sup>+2</sup> &gt; NH<sub>4</sub><sup>+</sup>-N &gt; NO<sub>3</sub><sup>−</sup>-N. pH values ranged from 4.5 to 6.9, with 17 events with pH &lt;5.6 and 5 events with pH − were the dominant ions with sea salt as main contribution. Acidity, enrichment factors and principal component analysis (PCA) indicate that F<sup>−</sup>, SO<sub>4</sub><sup>−2</sup> and NO<sub>3</sub><sup>−</sup>-N in the rainwater came from anthropogenic sources. Fluoride correlated strongly (&gt;0.85) with Ca<sup>+2</sup> and Mg<sup>+2</sup>, likely originated from same source in the aluminum production chain. Potassium originated from a mixture of anthropogenic and natural sources, with a good correlation (&gt;0.70) with NO<sub>3</sub><sup>−</sup>-N and NH<sub>4</sub><sup>+</sup>-N, indicating biomass burning and fertilizer origins. In 2012, Barcarena total bulk deposition ranged from 14,070 to 17,890 mg m<sup>−2</sup> y<sup>−1</sup> with significant contributions of SO4<sup>−2</sup> (2,385 to 2,851 mg m<sup>−2</sup> y<sup>−1</sup>), F<sup>−</sup> (419 to 479 mg m<sup>−2</sup> y<sup>−1</sup>) and NO<sub>3</sub><sup>−</sup>-N (128 to 280 mg m<sup>−2</sup> y<sup>−1</sup>). EC values (4 to 254 µS cm<sup>−1</sup>) indicated a medium site pollution severity (&gt; 175 µS cm<sup>−1</sup>), which increased the risk of damage to electrical components. <b>Highlights</b>Chemical characterization of Barcarena, PA/Brazil rainwater in 2012 events.Apportionment sources of ionic rainwater content evaluated by acidity fraction, enrichment factors and principal component analysis.Anthropic fluoride, sulfate and nitrate local deposition values were compared with other regional data.Maintenance procedure recommendations under identified atmospheric deposition. Chemical characterization of Barcarena, PA/Brazil rainwater in 2012 events. Apportionment sources of ionic rainwater content evaluated by acidity fraction, enrichment factors and principal component analysis. Anthropic fluoride, sulfate and nitrate local deposition values were compared with other regional data. Maintenance procedure recommendations under identified atmospheric deposition.