Application of a Mass Balance Model To Assess In-Place Arsenic Pollution

Diamond, Miriam L.

doi:10.1021/es00001a004

Cited by 29 publications

(25 citation statements)

References 24 publications

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“…4). This was expected in a shallow energetic system such as the Venice Lagoon (Diamond, 1995). As ) (as an example of an organic and an inorganic contaminant) between water and upper and lower sediment layers (0-3 cm, 3-20 cm depth) for segments 4 (northern Lagoon), 6 (central basin) and 9 (southern Lagoon).…”

Section: Contaminant Fatementioning

confidence: 82%

“…The fugacity-aquivalence approach used in our model has been used to quantify the fate of a variety of contaminants in numerous aquatic system (Diamond, 1995(Diamond, , 1999Dalla Valle et al, 2003). Details of the model are described elsewhere (Diamond et al, 1992;Mackay, 2001).…”

Section: Fugacity-aquivalence Fate and Transport Modelmentioning

confidence: 99%

“…The steady-state approximation is used to represent average long-term conditions. The pseudo-steady-state approach, whereby the fugacity of the chemical is specified in a compartment, is used for in-place pollution where sediment concentrations are not at steady state with respect to current loadings, as discussed below (Diamond, 1995).…”

Section: Fugacity-aquivalence Fate and Transport Modelmentioning

confidence: 99%

“…This process is modelled as sediment introduction from the lower to upper sediment. To estimate this loading, a pseudosteady-state formulation (Diamond, 1995) was used whereby the fugacity/ aquivalence of the lower sediment layer of segment 6 was specified for each contaminant based on measured concentrations, rather than solved for in the mass balance equations. Thus, contaminant in the lower sediment layer is considered as an infinite source, similarly to emissions from air.…”

Section: Mtcmentioning

confidence: 99%

“…Model scenarios were run with one source at a time to elucidate the contribution of contaminant sources to the geographic segments. This approach employs the linear additivity principle whereby contaminant concentrations (and mass) from individual sources linearly add to the total because of the linearity of the model (Stiver and Mackay, 1989;Diamond, 1995). Although the absolute contributions from each source are uncertain, the qualitative results are instructive.…”

Section: Source Apportionmentmentioning

confidence: 99%

See 4 more Smart Citations

Contaminant fate and transport in the Venice Lagoon: Results from a multi-segment multimedia model

Sommerfreund

Gandhi

Diamond

et al. 2010

Ecotoxicology and Environmental Safety

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a b s t r a c tContaminant loadings to the Venice Lagoon peaked from 1950s-1980s and although they have since declined, contaminant concentrations remain elevated in sediment and seafood. In order to identify the relative importance of contaminant sources, inter-media exchange and removal pathways, a modified 10-segment fugacity/aquivalence-based model was developed for octachlorodibenzodioxin/furan (OCDD/F), PCB-180, Pb and Cu in the Venice Lagoon. Results showed that in-place pollution nearby the industrial area, current industrial discharges, and tributary loadings were the main sources of contaminants to the lagoon, with negligible contributions from the atmosphere. The fate of these contaminants was governed by sediment-water exchange with simultaneous advective transport by water circulation. Contaminants circulated amongst the northern and central basins with a small fraction reaching the far southern basin and the Chioggia inlet. As a consequence, we estimated limited contaminant transfer to the Adriatic Sea, trapping the majority of contaminants in the sediment in this ''average'' circulation scenario which does not account for periodic flooding events.

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Section: Contaminant Fatementioning

confidence: 82%

Section: Fugacity-aquivalence Fate and Transport Modelmentioning

confidence: 99%

Section: Fugacity-aquivalence Fate and Transport Modelmentioning

confidence: 99%

Section: Mtcmentioning

confidence: 99%

Section: Source Apportionmentmentioning

confidence: 99%

See 3 more Smart Citations

Contaminant fate and transport in the Venice Lagoon: Results from a multi-segment multimedia model

Sommerfreund

Gandhi

Diamond

et al. 2010

Ecotoxicology and Environmental Safety

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Arsenic in Natural Environments

Henke

2009

Arsenic

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The role of phytoplankton in the removal of arsenic by sedimentation from surface waters

Faye

Diamond

1996

Hydrobiologia

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The role of phytoplankton in the removal of arsenic (As) by particle adsorption and sedimentation was investigated in Moira Lake, Canada . Sampling water and suspended particles over one year illustrated significant variation in As partitioning between particulate and aqueous phases, but failed to establish a correlation between the partition coefficient, Kd, and indicators of phytoplankton biomass . A highly significant inverse logarithmic relationship was noted between Kd and the concentration of suspended particles (log Kd =5 .1-1 .4 log SS ; p = 0.0001) in an apparent demonstration of the particle concentration effect (O' Connor & Connolly, 1980) . Particle deposition, measured by means of sediment traps, appeared to include a substantial component of resuspended surficial sediment making sediment trap results unreliable for quantifying the removal of substances from the water column . The As concentration of particles from deep traps deployed during late summer and early fall exceeded the As concentrations of suspended particles and surficial sediment, and may indicate that a highly contaminated nepheloid layer acts as a temporary sink for As .

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Application of a Mass Balance Model To Assess In-Place Arsenic Pollution

Cited by 29 publications

References 24 publications

Contaminant fate and transport in the Venice Lagoon: Results from a multi-segment multimedia model

Contaminant fate and transport in the Venice Lagoon: Results from a multi-segment multimedia model

Arsenic in Natural Environments

The role of phytoplankton in the removal of arsenic by sedimentation from surface waters

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