Artículo
Iron buffer system in the water column and partitioning in the sediments of the naturally acidic Lake Caviahue, Neuquén, Argentina
Cabrera, Juan Manuel
; Diaz, Monica Mabel
; Schultz, Sabina
; Temporetti, Pedro Felix
; Pedrozo, Fernando Luis
Fecha de publicación:
05/2016
Editorial:
Elsevier Science
Revista:
Journal of Volcanology and Geothermal Research
ISSN:
0377-0273
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Sedimentary iron partitioning was studied for five sediment strata (16 cm depth) at three sampling sites of the naturally-occurring acidic Lake Caviahue (Patagonia, Argentina). Additionally, water column iron was modeled based on five-year period input loadings to study a possible iron buffer system. The partition coefficient between the water column and the total iron content of the sediments was also addressed. Sedimentary iron was found to be distributed, on average, in the following forms: exchangeable (6%), iron oxides (4%), pyrite and reactive organic matter (38%) and residual (non-andesitic) materials with a high content of humic acids (52%). Furthermore, we found that the dissolved iron in the lake was nearly constant throughout the five year period we studied. This is consistent with the existence of an iron buffer system in the lake at pH between 2.0 and 3.0, which may cause differential iron precipitation at the delta of the volcanic river with respect to the deeper northern and southern arms. Sedimentary iron measurements taken at the delta further support the existence of a buffer system, where it was found that the iron content in the sub-superficial stratum (2 cm) was double that of the remainder of the vertical profile at the same site.
Palabras clave:
Acid Lake
,
Humic Acids
,
Iron Buffer System
,
Iron Modeling
,
Iron Partitioning
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Articulos(INIBIOMA)
Articulos de INST. DE INVEST.EN BIODIVERSIDAD Y MEDIOAMBIENTE
Articulos de INST. DE INVEST.EN BIODIVERSIDAD Y MEDIOAMBIENTE
Citación
Cabrera, Juan Manuel; Diaz, Monica Mabel; Schultz, Sabina; Temporetti, Pedro Felix; Pedrozo, Fernando Luis; Iron buffer system in the water column and partitioning in the sediments of the naturally acidic Lake Caviahue, Neuquén, Argentina; Elsevier Science; Journal of Volcanology and Geothermal Research; 318; 5-2016; 19-26
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