Search results for "fosforo"
showing 8 items of 8 documents
Minerali Macro
2006
Are agricultural soils under a continental temperate climate susceptible to episodic reducing conditions and increased leaching of phosphorus?
2012
International audience; Soil science research has probably underestimated the significance that short-term, episodic cycles of reduction and oxidation has had on phosphorus (P) reactivity. Here, the effects of eleven pulsed reduction-oxidation (including wet-dry) cycles on soil P dynamics are compared for 12 soils having contrasting properties and all overfertilised with respect to P. The laboratory based incubation conditions attempted to simulate transient waterlogging of the soil profile and involved repeated sampling and analysis of both the solution and solid phase P forms. An initial increase in P concentration in solution that occurred up to and including the fourth full cycle was fo…
Wytwarzanie penicyliny G przez Penicillium chrysogenum jako marker biodegradacji związków fosfonoorganicznych
2011
Metody zatężania i oznaczania ksenobiotyków - pestycydów fosforoorganicznych z próbek środowiskowych i żywności
2013
Impianto perfezionato per il trattamento di acque reflue
2019
Negli ultimi anni, a causa dell’incremento dei costi di smaltimento dei fanghi prodotti nel corso dei processi depurativi basati su metodi biologici, si va diffondendo sempre più la tendenza e la necessità di ridurne la produzione direttamente alla fonte, ovvero nel corso dello stesso processo che li genera. Diversi metodi sono proposti in letteratura e molti di essi sono già coperti da brevetto (OSA®, Cannibal®, Biminnex®), applicati ai processi biologici a fanghi attivi convenzionali (CAS). Il limite di questi processi è che una riduzione molto spinta della produzione di fango di supero, ottenuta sottoponendo la biomassa a stress biologico, comporta significativi peggioramenti della quali…
Phosphorus Loss in Overfertilized Soils: The Selective P Partitioning and Redistribution Between Particle Size Separates
2007
Using 12 well-characterised European soils contrasting in their physical and chemical properties, we demonstrate significant differences in the partitioning of phosphorus (P) between various particle size separates. Samples of each soil were subjected to one of three methods of increasingly aggressive dispersion in the order water (WD), mechanical (MD) or chemical (CD). A general, although not exclusive, inverse relationship existed between the concentration of various attributes (these included organic carbon, oxalate and dithionite iron contents, total P, resin and water extractable P) and particle size. The quantity, composition and physico-chemical properties of individual size separate…
The influence of pulsed redox conditions on soil phosphorus
2010
Abstract. The effects of eleven pulsed reduction-oxidation cycles (20 and 2 days, respectively) on soil phosphorus (P) dynamics are compared for 12 soils having contrasting properties and overfertilised with respect to P. Incubation conditions simulated transient waterlogging of the soil profile and involved repeated sampling and analysis of both the solution and solid phase P forms. An initial increase in P concentration occurred upto and including the fourth full cycle was followed by a sharp decline in concentration for all but one soil. Accompanying changes in the main extractable forms of P, which appeared to be cumulative, could be summarised as a general decline in the organic P frac…
Plastifikatoru, halogenēto un fosfororganisko antipirēnu noteikšana mājas putekļos izmantojot masspetrometrijas metodes
2020
Plastifikatoru, halogenēto un fosfororganisko antipirēnu noteikšana mājas putekļos izmantojot masspektrometrijas metodes. Elīna Pasečnaja. Zinātniskais vadītājs Dr. ķīm. Dzintars Začs. Maģistra darbs, 57 lapas, 5 attēli, 15 tabulas, 67 literatūras avoti, 3 pielikumi. Darbs latviešu valodā. Maģistra darbā ir apkopota informācija par plastifikatoru, halogenēto un fosfororganisko antipirēnu savienojumiem, to īpašībām, izmantošanu, toksicitāti, izplatību apkārtējā vidē, kā arī ir apskatītas plastifikatoru un antipirēnu noteikšanas metodes. Eksperimentālajā daļā ir izstrādāta un validēta analītiskā metode plastifikatoru un antipirēnu noteikšanai putekļu paraugos, kura ir pielietota putekļu parau…