FRACTIONATION OF Fe BY PARTICLE SIZE IN SOILS AND SEDIMENTS OF THREE RÍAS DE GALICIA (NW-ESPAÑA)

Abstract:

The Rías de Galicia are exclusive coastal systems of the NW of the Iberian Peninsula with high content in organic matter. The most relevant process in its sediments is the sulfate reduction, which has in the pyrite (FeS2) the thermodynamically more stable end product, which makes it the sink of many toxic elements, associating it with samples smaller than 63 μm of particle size. In this article, the DOP was determined in different particle sizes (coarse sand, fine sand, silt and clay), sediments of three Rías de Galicia (Ortigueira, Pontevedra and Vigo). Where the sand fraction obtained up to 30.46% Fe-Tr (total reactive iron). The analyzed sediments of the Rías de Vigo and Ortigueira presented a DOP between 42% and 75% that classified them as sub-oxic and anoxic environments, the Ria de Pontevedra sediment had a DOP< 42% being an oxic environment. The slime fraction had the highest DOP followed by the fraction clay and sand, possibly due to the size of the raspberry pyrite found, which are in the range of 8 to 20 μm.

Año de publicación:

2018

Keywords:

Fuente:

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