INVESTIGADORES
BEAMUD Sara guadalupe
artículos
Título:
The effect of pH on phosphorus sorbed from sediments in a river with a natural pH gradient
Autor/es:
TEMPORETTI P; BEAMUD G.; NICHELA D; BAFFICO G; PEDROZO, F.L.
Revista:
CHEMOSPHERE
Editorial:
PERGAMON-ELSEVIER SCIENCE LTD
Referencias:
Lugar: Amsterdam; Año: 2019
ISSN:
0045-6535
Resumen:
Phosphorus(P) is an essential nutrient for algal growth and its increase in water bodiesproduces eutrophication. On the other hand, sediments play an essential role inthe processes of transformation and accumulation of P in aquatic systems. pHbecame a major factor to control the availability of P bound sediment not onlyfor algal utilization and the consequent eutrophication of lakes but alsofor P precipitation tosediment. Most studies focussed on the effect of pH on P release from sedimentswere performed in laboratories where the pH gradient was simulated by addinghydrochloric acid solutions or sodium hydroxide. The aim of this paper is toevaluate the effect of pH on sediment P dynamics (release/uptake) in a river(Río Agrio, Argentina) with a natural pH gradient (1.5 -6.7) both in water and insediments. Sediment characteristics, phosphorus fractions and theeffect of pH on sediment P retention capacity s were evaluated. The results obtained showed that: all chemicalspecies analysed in the water decreased according topH-gradient increase; pHaffects sedimentP retention capacity, demonstrating that P retention capacity ishigher at high pH;P retention capacity is different dependant on the time ofyear: in fall, the average R was 41; in winter, the average R was 38; and insummer, the average R was 46. It was found that sediment P was controlled bythe oxyhydroxides of Fe and Al from pH 3.0 to 5.0 while at higher pH (5.0-7.0),Pwas controlled by Ca compounds.