6533b838fe1ef96bd12a4fd9
RESEARCH PRODUCT
Chemical speciation of polycyclic aromatic hydrocarbons in sediments: partitioning and extraction of humic substances.
Maria Rosaria ManninoSantino Orecchiosubject
chemistry.chemical_classificationPollutionPersistent organic pollutantGeologic Sedimentsmedia_common.quotation_subjectExtraction (chemistry)Solid Phase ExtractionSedimentFraction (chemistry)PAHsChemical speciationHumicSandy and muddy sedimentsAquatic ScienceChemical FractionationOceanographyPollutionSettore CHIM/12 - Chimica Dell'Ambiente E Dei Beni CulturaliGas Chromatography-Mass SpectrometrySpeciationHydrocarbonchemistryEnvironmental chemistryOrganic matterPolycyclic Aromatic HydrocarbonsHumic Substancesmedia_commonEnvironmental Monitoringdescription
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 show that PAHs are distributed between labile and sequestered fractions in sediments. A slower uptake of PAHs occurs when the sequestered fraction is formed, and this process can be prolonged and may be influenced by the characteristics if the sediment. Our study suggests that organic contaminants are available in muddy sediments for a longer period of time than in sandy sediments.
year | journal | country | edition | language |
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2010-08-01 | Marine pollution bulletin |