Phthalates and Nonylphenols in Roskilde Fjord

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To obtain an estimate of the DEHP mass flows in the Fjord system anintegrated mass balance, cf. Equation 12, comprising the two box modelsand the dispersion model is performed in an iterate process. The calculationsassume constant flows and concentrations for the DEHP sources.Steady-state will occur already after a few months in the water compartmentand it is therefore appropriate to consider the steady-state situationalone.For simplicity reasons the diffusive suction by the sediment is omitted,which is in accordance in steady-state considerations. The biomass concentrationin the water is a factor of 100 lower than in the WWTP andfurthermore it is not adapted to optimum DEHP degradation, thereforethe degradation rate per litre is set to be a factor of 1000 lower than in theWWTP, k 1 = 2 ⋅ 10 -8 sec -1 . This is probably still too high but it is compensatedby the removal by volatilisation.Apart from the degradation rate, there are no adjustments of the modelparameters in order to fit the modelled results to the experimental findings.In Table 25 and Figure 40, the steady-state DEHP contributions (+) andremovals (-) to the fjord water compartment, are shown in µg DEHP ⋅sec -1 .Table 25 Mass contributions in µg DEHP ⋅ sec -1 for the Vig, Bredningand narrow passage calculated from the water model.Vig Bredning Narrow passagePoint sources + 100(37 %)FreshwatersourcesNet water exchangeAtmosphericdeposition0(0 %)- 30(11 %)+ 30(11 %)Sedimentation - 100(37 %)Degradation - 10(4 %)+ 30(1 %)+ 720(33 %)- 80(4 %)+350(16 %)- 950(43 %)- 70(3 %)+ 70(3 %)+ 650(26 %)- 250(10 %)+ 530(21 %)- 940(38 %)- 70(3 %)78
µg DEHP / sec10008006004002000-200-400-600VigBredningNarrowpassageDEHP m ass flow inw ater com partm entFreshw ater sourcesPoint sourcesNet w ater exchangeAtm ospheric dep.Sedimentation-800-1000Degradation-1200Figure 40 Mass contributions in µg DEHP ⋅ sec -1 for the Vig, Bredning and narrowpassage calculated from the water model.The calculated total mean steady-state concentrations for the three regionsof the Fjord areVig: 32 ng DEHP ⋅ litre -1Bredning: 26 ng DEHP ⋅ litre -1Narrow passage: 19 ng DEHP ⋅ litre -1 (mean, cf. figure 41)It can be seen that the freshwater sources from streams are the main contributorsto DEHP in the Fjord water followed by atmospheric depositionand WWTP discharges. The removal processes are highly dominated bysedimentation, followed by water exchange with the sea and degradationbalances the contributions.The experimental sediment surface concentrations increase towards theinner parts of the Fjord. In the Vig the DEHP concentration is a factor of2 higher than in the Bredning and a factor of 10 higher than in the narrowpassage. In the narrow passage the flow and turbulence are considerablyhigher and the net sedimentation rate is reduced.By using the calculated steady-state concentration for the Bredning asboundary condition in the numerical solution for the narrow passage, thewater concentration profile in Figure 41 is obtained.79
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Data sheetTitle:Phthalates and Nony
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6.2 Sources 646.3 Model parameters
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The physico-chemical processes in t
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De fysisk-kemiske processer i fjord
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2 PurposeThe aim of the study has b
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In Table 3 the flow in the streams
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3.3 Samples of fjord sedimentFinall
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4 AnalyticalThe following substance
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4.5 Standards and spikesThe labelle
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In Table 9 the results of the test
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The analysis was carried out as des
Page 30 and 31: 100Concentration ng/l90807060504030
Page 32 and 33: 400300DBP ng/l2001000JunJunSepDecMe
Page 34 and 35: 5.1.3 Monthly samples in Roskilde V
Page 36 and 37: 5.1.4 Analysis of varianceTo evalua
Page 38 and 39: Table 15 Correlations at Stations 2
Page 40 and 41: 500r = 0.86 (p=0.01)400DEHP ng/l al
Page 42 and 43: Table 16 Concentrations in fjord se
Page 44: tion levels off, ultimately approac
Page 47 and 48: 200NPNPDEConcentration, ng/g d.m.15
Page 49 and 50: was observed in the flow direction
Page 51 and 52: 1000800meanConcentration, ng/g dw60
Page 53 and 54: NPDE and DEHP in the Hove Å system
Page 55 and 56: µg/m²/y000800600400200013-Nov27-N
Page 57 and 58: 6 Mathematical data interpretationI
Page 59 and 60: 6.1.2 Sorption and solvationIn the
Page 61 and 62: Different standard methods can be u
Page 63 and 64: Introducing the concentration of se
Page 65 and 66: substances migrate more rapidly tha
Page 67 and 68: • In 1969 in connection with work
Page 69 and 70: SeaDispersion modelBox-modelsIsefjo
Page 71 and 72: AtmosphericdepositionxdxN wx + ∂
Page 73 and 74: tWater gridxo• • •i+1 i i-1x
Page 75 and 76: 6.4.3 Dynamic solution to the diffu
Page 77 and 78: The two diffusion curves and the tw
Page 79: Fluxsedimentation /Fluxtotal1,00,90
Page 83 and 84: 7 ConclusionsDEHP was the most abun
Page 85 and 86: 8 ReferencesBerger, W.H. & Heath, G
Page 87: Smith, R. (1986): Mixing and Disper
Page 90 and 91: NPNPDENPEPAEPFKPhthalatesdSIMSpikeS
Page 92 and 93: dzD benzeneD DEHPVertical step in s
Page 94 and 95: Ptt sedzαθ sProduct from bio-degr
Page 97 and 98: 12 Appendix A.Analytical performanc
Page 99 and 100: 4000NPDE3000Mean + - sdRegression l
Page 101 and 102: 300250DEHPMean + - sdRegression lin
Page 103 and 104: and mass-spectrometrical characeris
Page 105 and 106: 1000800BBPMean + - sdRegression lin
Page 107 and 108: National Environmental Research Ins
Page 109: The aim of the study has been to in
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Phthalates and Nonylphenols in Roskilde Fjord

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