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8626459 
Journal Article 
Fractioning of phosphorus in lake sediments in a hydrographic microbasin in Northeastern Brazil 
Pereira De Araújo, MCS; Da Silva Silvino, G; De Oliveira Santos, JP; Dos Santos Silva, J; Barbosa, LG 
2020 
13 
2 
645-658 
Portuguese 
The trophic state of lakes generally depends on phosphorus concentration in the water which is, in turn, affected by the amount of the nutrient in the sediment. However, not all sedimentary phosphorus is available and demands quantification of fractions through chemical fractioning. Current analysis quantifies available fractions of phosphorus by employing chemical fractioning of the surface sediment in multiple-use reservoirs in high swamps. Research was undertaken in the hydrographic basin of the Rio do Canto (BHRC) (-6°55'52.31”S; 35°42'33.91”W and -6°58'41.26”S; -35°42'37.07”W), the region of the altitude swamp Areia PB Brazil, during November and December 2014. Further, pH, oxy-reduction potential, granulometry, rates of organic matter, iron, aluminum, calcium and sedimentary phosphorus fractions were measured by SMT protocol. Data underwent analysis of principal components. Bio-available fraction, equivalent to organic and non-apatite phosphorus ranged between 15 and 38% of total phosphorus rate in the sediment of monitored reservoirs in BHRC. Results show the following increasing order in phosphorus bio-availability for the reservoirs monitored in BHRC: R7
Available phosphorus; Multivariate analysis; Sediment quality