
handle: 10261/309668
[ES] Se presenta un método de incubación de testigos de sedimento aplicado por primera vez en las rías gallegas. Para la extracción de las muestras se utilizó una “box core” que permite la toma directa de muestras, de 7 a 10 cm de sedimento, junto con su agua sobrenadante, en tubos de plexiglás de 5,4 cm de d.i. y 25 cm de altura. Los testigos obtenidos se incuban en el laboratorio bajo condicciones de oscuridad y temperatura constante. Durante toda la experiencia se mantiene una circulación cerrada del agua sobrenadante en cada muestra, mediante una bomba peristáltica. El tiempo de incubación se estableció en 5 h. La representación de la concentración de nutriente frente al tiempo permite calcular los valores del flujo sedimento-agua. La técnica se ha aplicado a una serie de testigos extraídos en la zona interna de la ría de Vigo en diciembre de 1993. Para el silicato se ha obtenido un flujo de 186 µmol m-2 h-1
[EN] An incubation method for sediment cores, used in a Galician Ria for first time, is showed here. The cores were take out by a box core, obtaining unaltered samples (7-10 cm of sediment together with its supernatant water) in a plexyglas cylinder of 5.4 cm i.d. and 25 cm height. The cores were incubated in laboratory, under darkness and unchanged temperature conditions. During the experiment, supernatant water recirculation is maintained with a peristaltic pump. Incubation time was 5 hours. The values of fluxes sediment-water column were calculated using time-nutrient concentration diagrams. This method were applied for cores obtained in the inner zone of the Ria of Vigo in december 1993. Dissolved silicate flux was 186 µmol m-2 h-1
7 pages, 4 figures.--VII Seminario de Química Marina, Cádiz. 25 y 26 de enero de 1994
Proyecto XUGA 40203B92, financiado por la Xunta de Galicia
Peer reviewed
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