Chemical characteristics of rainwater at a southeastern site of Brazil

Developmental Biology

Denise Lowinsohn¹  Marcelo Fonseca Pinto¹  Marcos Rodrigues Facchini Cerqueira¹  Renato Camargo Matos¹  Wesley Tinoco Esteves¹  Ingrid Nunes Derossi¹  Maria Auxiliadora Costa Matos¹  Mellina Damasceno Rachid Santos¹ 

[1] NUPIS (Núcleo de Pesquisa em Instrumentação e Separações Analíticas), Departamento de Química, Instituto de Ciências Exatas, Universidade Federal de Juiz de Fora, 36036–330, Juiz de Fora, MG, Brazil$$

关键词: Rainwater;    chemical composition;    acidification process;    marine contribution;    source identification;   

DOI  :  10.5094/APR.2014.031

学科分类：农业科学（综合）

来源: Dokuz Eylul Universitesi * Department of Environmental Engineering

【 摘 要 】

A total of 50 rainwater samples were analyzed in order to investigate trace elements in wet precipitation of Juiz de Fora City, during February, 2010 and February, 2011. Samples were analyzed for major cations (H₃O⁺, Na⁺, NH₄⁺, K⁺, Mg²⁺ and Ca²⁺) and anions (NO₃⁻, SO₄²⁻, Cl⁻ and HCO₃⁻), hydrogen peroxide (H₂O₂), some trace metals (Cu²⁺, Zn²⁺, Cd²⁺ and Pb²⁺), as well as some other physicochemical aspects like pH, conductivity and redox potential. Rainwater pH mean was of 5.77 (±0.52). Cations and anions mean values ranged from 7.12 μEq L⁻¹ (K⁺) to 39.6 μEq L⁻¹ (Ca²⁺). Principal Component Analysis (PCA) with Varimax normalized rotation was performed, grouping the major analyzed cations and anions into different factors. Mg²⁺, K⁺, Ca²⁺ and HCO₃⁻ were assigned to soil contribution, Na⁺ and Cl⁻ to sea–salt contribution and NO₃⁻, SO₄²⁻ and NH₄⁺ to anthropogenic sources. Hydrogen peroxide average concentration was of 19.2 ± 17.5 μmol L⁻¹ with higher values in summer and lower in spring and autumn, reverse case was observed for H₃O⁺ levels. Zn²⁺ (7.31 ± 2.74) μg L⁻¹ and Cu²⁺ (4.07 ± 0.74) μg L⁻¹ were within the range of other studied areas, while Cd²⁺ and Pb²⁺ were below the detection limit.

【 授权许可】

Unknown   

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