Geochemical mobility of arsenic in the surficial waters from Argentina |
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| Authors: | Alicia Daniela Robles Paula Polizzi María Belén Romero Leila Natalia Chiodi Boudet Sandra Medici Agustín Costas Marcela Gerpe |
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| Institution: | 1.Toxicología Ambiental, Departamento de Ciencias Marinas, Instituto de Investigaciones Marinas y Costeras, Facultad de Ciencias Exactas y Naturales,Universidad Nacional de Mar del Plata,Mar del Plata,Argentina;2.Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET),Buenos Aires,Argentina;3.Laboratorio de Análisis Fares Taie,Mar del Plata,Argentina |
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| Abstract: | The presence of arsenic (As) in surface water constitutes an important environmental risk, where mobility and adsorption processes are responsible for its behavior in the sediment–water interface. Therefore, the assessment of adsorption, mobility and water availability of arsenic in freshwater sediments, with agricultural, livestock and urban soil uses was performed. Arsenic concentrations in sediments ranged from 5.4 to 15.9 mg kg?1 (total) and 2.8 to 6.5 mg kg?1 (labile), and those of iron and manganese were 11,563–23,500 and 140.6–662.1 mg kg?1, respectively. The As levels in water were significantly lower than those of sediments. Results would suggest that As co-precipitation and adsorption on Fe oxides are probably the major route of immobilization, determining its low lability. Manganese did not present an outstanding contribution to the retention, and cation-exchange capacity, pH and organic matter of sediments did not show an influence on the mobility of As. |
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