Internal phoshorus loading potential of a semiarid reservoir: an experimental study

Abstract: Aim To determine the internal P loading potential of semiarid tropical reservoir sediment while verifying driving factors that affect release rates. Methods An experiment was performed with water and from Boqueirão de Parelhas in Brazil. The effects three variables on were studied: air temperature (region average 28 °C 32 °C, simulating an increase 4 °C), pH 8, more acidic 6 alkaline 10) oxygen (presence absence). In addition, fractionation analysis forms sediment. Results It found minimum oxic treatment at (0.22 mg m-2 d-1 ± 0.13) maximum anoxic 10 (2.1 0.15). total 597 kg-1, major form NaOH-rP, bound to aluminum, corresponding 42% P. Conclusion These results allow us confirm is susceptible aluminum due prevalence this its sediments concomitant high temperatures water. This scenario can be aggravated by climate change.