Search results for "Organic pollutant"

Contamination from polycyclic aromatic hydrocarbons (PAHs) in the soil of a botanic garden localized next to a former manufacturing gas plant in Pale…

2010

The Botanical Garden lies within the city of Palermo, a few meters away from one of the largest unused Manufacturing Gas Plant in Sicily. The total concentrations of PAHs (23 compounds) in the soil of Botanical Garden ranged from 947 to 18,072 microg/kg. The wide range of PAH concentrations (RSD=84%) found in the soil samples indicates heterogeneous levels of contamination in the area and this can be explained by considering the different tree distributions which prevents the homogeneous deposition of pollutants on the soil. Soils collected in the Botanical Garden generally showed the highest PAH concentrations, being almost 2-3 times higher than the concentration samples obtained in the ur…

Oxygen-containing polycyclic aromatic hydrocarbons (OPAHs) in urban soils of Bratislava, Slovakia: patterns, relation to PAHs and vertical distributi…

2011

Abstract We determined concentrations, sources, and vertical distribution of OPAHs and PAHs in soils of Bratislava. The ∑14 OPAHs concentrations in surface soil horizons ranged 88–2692 ng g−1 and those of ∑34 PAHs 842–244,870 ng g−1. The concentrations of the ∑9 carbonyl-OPAHs (r = 0.92, p = 0.0001) and the ∑5 hydroxyl-OPAHs (r = 0.73, p = 0.01) correlated significantly with ∑34 PAHs concentrations indicating the close association of OPAHs with parent-PAHs. OPAHs were quantitatively dominated by 9-fluorenone, 9,10-anthraquinone, 1-indanone and benzo[a]anthracene-7,12-dione. At several sites, individual carbonyl-OPAHs had higher concentrations than parent PAHs. The concentration ratios of se…

Chemical speciation of polycyclic aromatic hydrocarbons in sediments: partitioning and extraction of humic substances.

2010

The primary objective of this study was to examine the chemical speciation of polycyclic aromatic hydrocarbons (PAHs) found in sediments endowed with different characteristics. To achieve this purpose and because the nature of the sediments influences the distribution of PAHs, we have analyzed four different types of sediments. To study the role of organic matter in the sequestration of PAHs, we fractionated humic substances into humic acids and humin–mineral fractions. After their separation and purification, the humic components were examined for their sorptive reactivity by extracting them with organic solvents; these extracts were subsequently subjected to GC/MS analysis. Our results sh…

Emerging pollutants in the aquatic environment: Assessment in biota and influence of microplastics

2021

El medio ambiente sufre el vertido continuo de contaminantes antropogénicos, incluyendo compuestos orgánicos, como fármacos y productos de cuidado personal (PPCPs), plaguicidas, sustancias perfluoroalquiladas (PFASs), drogas de abuso y microplásticos. Algunos de estos contaminantes son de hecho considerados contaminantes emergentes. Una de las principales fuentes de contaminantes al medio ambiente son las estaciones depuradoras de aguas residuales Además, existen otras fuentes de carácter más difuso como la infiltración o las aguas de escorrentía, que pueden transportar plaguicidas y otros contaminantes emergentes empleados en los campos de cultivo. Todos estos vertidos suelen tener un dest…

Electrochemical incineration of oxalic acid in a micro gap flow cell

2009

Concentrations of PAHs, PCBs and OC pesticides in intertidal marine gastropods of Sicily (Mediterranean Sea).

2009

Persistent Organic Pollutants (POPs), such as polychlorinated biphenyls (PCBs), organochlorine pesticides (OCs) and polycyclic aromatic hydrocarbons (PAHs) are toxic organic compounds able to persist in the Environment for long time. They can be accumulated through food webs and this could be a risk to some extent to threat human health and environmental quality. Marine currents represent further important distribution way of POPs through marine habitats and organisms. In Sicily, no much attention has been paid on POPs distribution on coastal habitats, important reservoirs of biodiversity, even if these are strongly influenced by anthropogenic pressure. In this study, concentrations of PCBs…