Search results for "PAH"
showing 10 items of 251 documents
Pahan ja kuoleman tematiikka J. K. Rowlingin Harry Potter -kirjasarjassa
2009
Sedimentary record of anthropogenic contaminants (trace metals and PAHs) and organic matter in a Mediterranean coastal area (Gulf of Palermo, Italy)
2009
Abstract The Gulf of Palermo (Italy, Mediterranean Sea) is a contaminated coastal environment with a relatively high influx of unregulated industrial and domestic effluents. Two sediment box-cores were collected at water depths of 100 and 712 m. Samples were analysed for trace metals (As, Cu, Hg, Mn, Ni, Pb), total polycyclic aromatic hydrocarbons (ΣPAHs), organic carbon to total nitrogen (Corg/Ntot) ratios and organic carbon and nitrogen isotopic composition (δ13Corg and δ15Ntot). At the coastal site, trace metal and ΣPAH depth profiles show a clear upcore increase, indicating increasing contamination over the recent past. Concentrations of ΣPAHs, Hg, Pb, Cu, and As appear to be potentiall…
Microbes and Persistent Organic Pollutants in the Marine Environment
2020
Marine pollution has increased reaching the entire marine environment, from the surface to the deepest sediment, and has become more concerning in the last 70 years. Persistent organic pollutants (POPs) are a fraction of ocean waste that includes, among the others, polycyclic aromatic hydrocarbons (PAHs) and plastic polymers. These chemicals have an extremely long half-life, and (bio)accumulate and damage the marine flora and fauna, and, ultimately, human health. Some organisms have evolved enzymes to attack POPs in the environment and transform them into biomass and CO2. Several microorganisms degrade many POPs in relatively short time. A wide variety of bacteria has been isolated with dif…
Predicting the bioaccumulation of polyaromatic hydrocarbons and polychlorinated biphenyls in benthic animals in sediments
2016
There were two main objectives in this study. The first was to compare the accuracy of different prediction methods for the chemical concentrations of polyaromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs) in the organism, based on the measured chemical concentrations existing in sediment dry matter or pore water. The predicted tissue concentrations were compared to the measured ones after 28-day laboratory test using oligochaeta worms (Lumbriculus variegatus). The second objective was to compare the bioaccumulation of PAHs and PCBs in the laboratory test with the in situ bioaccumulation of these compounds. Using the traditional organic carbon-water partitioning model, tissue…
Impact of human activities on the central Mediterranean offshore: Evidence from Hg distribution in box-core sediments from the Ionian Sea
2008
The Palermo and Augusta urban/industrial areas (Sicily) are examples of contaminated coastal environments with a relatively high influx of unregulated industrial and domestic effluents. Three sediment box-cores were collected offshore of these urban/industrial areas in water depths of 60–150mduring two cruises (summers 2003/2004), dated by 210Pb and 137Cs, and analysed for total mercury concentration and total polycyclic aromatic hydrocarbon (PAH) concentration. Benthic foraminiferal assemblages were also examined (in terms of their distribution and morphology) to assess the potential use of benthic foraminifera as bioindicators of pollutant input and environmental change in these Mediterra…
PM2.5-bound oxygenated PAHs, nitro-PAHs and parent-PAHs from the atmosphere of a Chinese megacity: Seasonal variation, sources and cancer risk assess…
2014
Polycyclic aromatic compounds (PACs) in air particulate matter contribute considerably to the health risk of air pollution. The objectives of this study were to assess the occurrence and variation in concentrations and sources of PM2.5 bound PACs [Oxygenated PAHs (OPAHs) nitro PAHs and parent PAHs] sampled from the atmosphere of a typical Chinese megacity (Xi'an) to study the influence of meteorological conditions on PACs and to estimate the lifetime excess cancer risk to the residents of Xi'an (from inhalation of PM2.5 bound PACs). To achieve these objectives we sampled 24 h PM2.5 aerosols (once in every 6days from 5 July 2008 to 8 August 2009) from the atmosphere of Xi'an and measured the…
Analytical method for PAHs chemical speciation in sediments
2008
The aim of this work is to optimize a method to examine the PAHs chemical speciation during the aging of sediments that is important in order to known the toxicological risk of a polluted area. In particular, we have conducted this research in order to determine if the organic contaminants fate is dependent to sediment characteristics and to study the potential role of humin and alkaline-extractable humic substances in the sequestration of PAHs in sediment. The Polycyclic Aromatic Hydrocarbons (PAHs) include molecules containing fused aromatic rings and are of special concern because of their widespread distribution throughout the environment and their often toxic and carcinogenic propertie…
Trace elements and PAHs in surface sediments and biota from a contamination hot spot (Augusta Bay, Italy): potential export to the adjoining coastal …
2013
Korkeakouluopiskelijoiden kokemuksia korkeakoulujen opiskelijakulttuurin ja alkoholin välisistä suhteista
2011
Tämän pro gradu-tutkielmani kohteena olivat korkeakoulujen opiskelijakulttuurin ja alkoholin väliset suhteet. Tutkimuksessa asiaa tarkasteltiin nimenomaan korkeakouluopiskelijoiden omien kokemuksien kautta. Tutkimukseni tavoitteena oli selvittää erityisesti sitä, muuttuvatko nuorten juomatottumukset ja alkoholiin suhtautuminen korkeakouluopiskelun aloittamisen myötä sekä kokevatko korkeakouluopiskelijat alkoholin erottamattomaksi osaksi korkeakoulujen opiskelijakulttuuria. Tutkimukseeni osallistui kaikkiaan 27 korkeakouluopiskelijaa (11 miestä ja 16 naista), joista 15 opiskeli yliopistossa ja 12 vastaavasti ammattikorkeakoulussa. Koska alkoholi on tutkimusaiheena varsin arka, tutkimuksen ai…
Vuonna 2016 järjestetyn elinsiirtoliikunnan tapahtumaviikon vapaaehtoisten motiivit
2020
Urheilutapahtumien vapaaehtoisia ja heidän motiivejaan on tutkittu paljon erikokoisissa tapahtumissa, mutta vammaisurheilutapahtumien vapaaehtoisia on tutkittu vähemmän. Tutkimuksen tarkoituksena oli selvittää, millaisia ovat Elinsiirtoliikunnan tapahtumaviikon vapaaehtoiset ja heidän osallistumisensa motiivit ja eroavatko motiivit taustamuuttujien suhteen. Tutkimusaineisto kerättiin sähköisellä kyselyllä, joka lähetettiin 182 vapaaehtoiselle. Vastausprosentti oli 52 prosenttia (n=95, naisia 63 %, miehiä 37 %).Vastaajien keski-ikä oli 49,7 vuotta (kh 16,8). Motiivien tutkimisessa käytettiin Special Event Volunteer Motivation Scaleen (SEVMS) perustuvaa mittaria, jossa oli 34 motiiveja kartoi…