Phenanthrene is used as a model hydrophobic organic compound to study the sorption properties of ... more Phenanthrene is used as a model hydrophobic organic compound to study the sorption properties of the Gulf of Aliveri (Greece) marine sediments. Sorption of hydrophobic organic compounds is mainly related to the organic matter present in the sediments. The presence of particles due to anthropogenic activity in the sediments can highly influence their sorption behavior. Sediments from the Gulf of Aliveri contain different proportions of such particles i.e., lignite, coal, and char. The hypothesis of the present study is that salinity can affect the fate of this pollutant by affecting the degree of sorption nonlinearity and sorption capacity. Since the sorption nonlinearity is a function of heterogeneity, different materials are used to compare their sorption behavior in solutions with and without salinity. Results expected from this study include a) the surface properties of the different sediments and the materials tested and b) sorption capacities in i) fresh and ii) salt water for phenanthrene. In general, it is observed that for carbonaceous particles and sediments containing such particles at lower phenanthrene concentrations, sorption in saltwater solutions is lower than in fresh water solutions.
Zeitschrift der Deutschen Geologischen Gesellschaft, Jun 6, 1997
Die Ergebnisse der palynologischen Untersuchung eines 10,6-m-mächtigen Torfprofils aus der Torfla... more Die Ergebnisse der palynologischen Untersuchung eines 10,6-m-mächtigen Torfprofils aus der Torflagerstätte bei Kalodiki, West-Griechenland, werden in der vorliegenden Arbeit aufgeführt. In den Torf schalten sich dünne Lagen aus Ton, Tonmudde und Kalkmude ...
New pollen data from three contrasting sites in northern Greece allow an analysis of spatial and ... more New pollen data from three contrasting sites in northern Greece allow an analysis of spatial and temporal patterns of vegetation change during the Holocene and Lateglacial in northern Greece. At the principal site, Nisi Fen, six cores from the thickest surficial peat deposits have yielded a detailed, composite, AMS14C-dated pollen record covering the period from 20000 cal. BP almost to the present-day. Cores Kp-4 and Bor-3 were taken from small mires at high elevations in the Boras mountains, a few kilometres to the north of Nisi, in which peat has been accumulating since the mid-Holocene. Our results show that only Pinus expanded significantly during the Lateglacial Interstadial, although small thermophilous tree populations were present in the region. The Younger Dryas chronozone is at best marked by subtle vegetational change in favour of steppe taxa. Tree cover increased rapidly at the beginning of the Holocene, with deciduous woodland probably expanding above its present-day altitudinal limits. There is evidence for drier and/or warmer summers, and mild winters, between c. 10500 and 7500 cal. BP, although the vegetation was not as markedly sclerophyllous as at many sites elsewhere in Greece. The mid-Holocene saw a reorganization of the woodland, with first Abies and then Fagus becoming important at high altitudes, and an increase in the diversity of deciduous woodland at medium elevations. The suggestion of human impact in the form of a decline in woodland and the appearance of crops in the pollen record can be found at all altitudes in the later Holocene.
Phenanthrene is used as a model hydrophobic organic compound to study the sorption properties of ... more Phenanthrene is used as a model hydrophobic organic compound to study the sorption properties of the Gulf of Aliveri (Greece) marine sediments. Sorption of hydrophobic organic compounds is mainly related to the organic matter present in the sediments. The presence of particles due to anthropogenic activity in the sediments can highly influence their sorption behavior. Sediments from the Gulf of Aliveri contain different proportions of such particles i.e., lignite, coal, and char. The hypothesis of the present study is that salinity can affect the fate of this pollutant by affecting the degree of sorption nonlinearity and sorption capacity. Since the sorption nonlinearity is a function of heterogeneity, different materials are used to compare their sorption behavior in solutions with and without salinity. Results expected from this study include a) the surface properties of the different sediments and the materials tested and b) sorption capacities in i) fresh and ii) salt water for phenanthrene. In general, it is observed that for carbonaceous particles and sediments containing such particles at lower phenanthrene concentrations, sorption in saltwater solutions is lower than in fresh water solutions.
Zeitschrift der Deutschen Geologischen Gesellschaft, Jun 6, 1997
Die Ergebnisse der palynologischen Untersuchung eines 10,6-m-mächtigen Torfprofils aus der Torfla... more Die Ergebnisse der palynologischen Untersuchung eines 10,6-m-mächtigen Torfprofils aus der Torflagerstätte bei Kalodiki, West-Griechenland, werden in der vorliegenden Arbeit aufgeführt. In den Torf schalten sich dünne Lagen aus Ton, Tonmudde und Kalkmude ...
New pollen data from three contrasting sites in northern Greece allow an analysis of spatial and ... more New pollen data from three contrasting sites in northern Greece allow an analysis of spatial and temporal patterns of vegetation change during the Holocene and Lateglacial in northern Greece. At the principal site, Nisi Fen, six cores from the thickest surficial peat deposits have yielded a detailed, composite, AMS14C-dated pollen record covering the period from 20000 cal. BP almost to the present-day. Cores Kp-4 and Bor-3 were taken from small mires at high elevations in the Boras mountains, a few kilometres to the north of Nisi, in which peat has been accumulating since the mid-Holocene. Our results show that only Pinus expanded significantly during the Lateglacial Interstadial, although small thermophilous tree populations were present in the region. The Younger Dryas chronozone is at best marked by subtle vegetational change in favour of steppe taxa. Tree cover increased rapidly at the beginning of the Holocene, with deciduous woodland probably expanding above its present-day altitudinal limits. There is evidence for drier and/or warmer summers, and mild winters, between c. 10500 and 7500 cal. BP, although the vegetation was not as markedly sclerophyllous as at many sites elsewhere in Greece. The mid-Holocene saw a reorganization of the woodland, with first Abies and then Fagus becoming important at high altitudes, and an increase in the diversity of deciduous woodland at medium elevations. The suggestion of human impact in the form of a decline in woodland and the appearance of crops in the pollen record can be found at all altitudes in the later Holocene.
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