1,721,051 research outputs found
Advanced oxidation and adsorption technologies for organic micropollutant removal from lake water used as drinking-water supply
No full textLa disinfezione delle acque reflue e l’impatto sulla comunità microbica
No full textLa nota contiene alcune considerazioni legate diffusa pratica di trattamento di disinfezione delle acque reflue e, quindi, al relativo potenziale impatto tossicologico sulla popolazione microbica presente nel corpo idrico ricettore, alla luce della normativa vigente
Potential genotoxic effects of surface drinking water treated with chlorine and alternative disinfectans
No full textA pilot plant for in situ monitoring of mutagenic by-products by disinfection of surface water.
No full textDeterminazione di tossine algali (microcistine e nodularina) nelle acque superficiali
Full text linkViene proposto un metodo analitico per la determinazione dei principali congeneri delle microcistine (MCs) e della nodularina (NOD) presenti in campioni di acqua sia in fase disciolta (extracellulare) che all’interno delle cellule algali (endocellulare). Le due frazioni, extra ed endocellulare, vengono separate mediante filtrazione del campione acquoso. Le microcistine citoplasmatiche vengono estratte, previa procedura di congelamento-scongelamento della componente cellulare, con solvente organico in bagno ad ultrasuoni. Le tossine algali presenti nel campione in forma disciolta vengono invece concentrate mediante SPE (Solid-Phase Extraction) su fase C18. Entrambi gli estratti possono essere analizzati in HPLC-DAD, LC-MS o con il saggio ELISA
The role of zooplankton in DDT biomagnification in a pelagic food-web of Lake Maggiore (Northern Italy)
No full textIn the present study, we report the analytical results of pp'DDT, pp'DDE and pp'DDD determination in lake water, plankton and zooplanktivorous fish of Lake Maggiore (Northern Italy), rather recently polluted by DDT of industrial origin, in order to understand the bottom-up pollution transfer among the abiotic and biotic components of the lake ecosystem.
Fourteen water sampling campaigns were carried out from March 2003 to January 2009 in the water column of the deepest point (Ghiffa) of Lake Maggiore. Suspended and dissolved pollutants were determined separately. Three sampling campaigns were carried out from July 2008 to January 2009 for zooplankton and pelagic fish, and DDT residues were analysed by HRGC coupled with ECD and MS. Moreover, food items were detected in fish stomachs.
Starting from 2007, the DDT contamination along the water column became rather homogeneous, probably because no flooding or other relevant hydrological events occurred; although steady-state condition should be expected, lipid normalised concentrations of pp'DDE and pp'DDD in zooplankton exceeded the levels of the same compounds in zooplanktivorous fishes.
As this finding represents a thermodynamic paradox since bioaccumulative pollutant concentrations are expected to increase along the trophic chain, it was supposed that the abiotic and biotic lake components were not in a steady-state condition in Lake Maggiore
Valutazione dell’attività genotossica delle acque del Lago di Como e localizzazione delle fonti di contaminazione
No full textEvaluation of genotoxicity of Italian lakewater for human consumption: a case study in Lombardy
No full textConcentrations and trophic interactions of novel brominated flame retardants, HBCD, and PBDEs in zooplankton and fish from Lake Maggiore (Northern Italy)
No full textFollowing the release of the international regulations on PBDEs and HBCD, the aim of this study is to evaluate the concentrations of novel brominated flame retardants (NBFRs), including 1,2-bis(2,4,6-tribromophenoxy) ethane (BTBPE), decabromodiphenyl ethane (DBDPE), hexabromobenzene (HBB), and pentabromoethylbenzene (PBEB), in an Italian subalpine lake located in a populated and industrial area. The study investigated specifically the potential BFR biomagnification in a particular lake's pelagic food web, whose structure and dynamics were evaluated using the Stable Isotope Analysis. The potential BFR biomagnification was investigated by using the trophic-level adjusted BMFs and Trophic Magnification Factors (TMFs), confirming that HBCD and some PBDE congeners are able to biomagnify within food webs. Comparing the calculated values of BMFTL and TMF, a significant positive correlation was observed between the two factors, suggesting that the use of BMFTL to investigate the biomagnification potential of organic chemical compounds might be an appropriate approach when a simple food web is considered
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