coastal ecosystems. J. Richir, N. Luy, P. Serpe,

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Presentation transcript:

Combined utilization of DGTs and bioindicators to trace chemical contamination threats on coastal ecosystems. J. Richir, N. Luy, P. Serpe, L. Lefèbvre, A. Deraikem, G. Lepoint, R. Biondo, J.-M. Bouquegneau, S. Gobert. Liège 03-05-11

Introduction Direct measurements in seawater : low, punctual and fluctuating concentrations; preconcentrations; bioaccessible fraction? I N T R O D U C Ecotoxicology : bioindicators = organisms accumulating pollutants to levels representative of their habitat pollution status. Posidonia oceanica Mytilus galloprovincialis

Introduction Davison and Zhang (1994). In situ speciation measurements of trace components in natural waters using thin-film gels. Nature. 367: 546-548. (Lancaster University, UK) I N T R O D U C DGT = diffusive gradients in thin films

Introduction I N T R O D U C

Introduction I N T R O D U C 24h00 M = Ce (VHNO3 + Vgel) / fe ELAN DRCII 24h00 M = Ce (VHNO3 + Vgel) / fe I N T R O D U C CDGT = MΔg/(DtA) HNO3 1M resin Temp. (°C) D (E-6 cm2/sec) of Pb … 19 6.79 20 6.99 21 7.19 22 7.40 23 7.61 M: mass of metal accumulated Ce: [metal ] in HNO3 1M Vgel: Vol. of resin gel (0.15 ml) fe: elution factor (0.8) CDGT: [metal ] measured by DGT Δg: thickness of the diffusive gel (0.08mm) + thickness of the filter membrane (0.14 mm) D: Diffusion coefficient of metal in the gel t: deployment time (sec) A: exposure area (3.14 cm2)

Introduction I N T R O D U C 24h00 M = Ce (VHNO3 + Vgel) / fe ELAN DRCII 24h00 M = Ce (VHNO3 + Vgel) / fe I N T R O D U C CDGT = MΔg/(DtA) HNO3 1M resin

Field applications APPLICATIONS

Field applications APPLICATIONS

Field applications APPLICATIONS

Seasonal variations of P. oceanica [Cd] APPLICATIONS 1

Applications APPLICATIONS

Seasonal variations of P. oceanica [Cd] APPLICATIONS 1

Seasonal variations of P. oceanica [Cd] APPLICATIONS 1 x1,6

Seasonal variations of P. oceanica [Cd] APPLICATIONS 1

Seasonal variations of P. oceanica [Cd] Posidonia oceanica > 105-6 times > water APPLICATIONS 1

In situ TE contamination of P. oceanica bed APPLICATIONS 2

In situ TE contamination of P. oceanica bed APPLICATIONS 2 6 days of contamination; 15 TE (Pb, Co, Ag, Al, Mn, etc.); 410L bell-shaped mesocosm; Contamination every 12 hours (9am-9pm); 15 days of decontamination.

Pb contamination APPLICATIONS 2 seawater average [Pb] : 0.143 ppb contamination level : 5 ppb APPLICATIONS 2

Pb contamination APPLICATIONS 2 seawater average [Pb] : 0.143 ppb contamination level : 5 ppb APPLICATIONS 2

Pb contamination APPLICATIONS 2 seawater average [Pb] : 0.143 ppb contamination level : 5 ppb APPLICATIONS 2

Pb contamination APPLICATIONS 2 seawater average [Pb] : 0.047 ppb contamination level : 1.040 ppb (5 ppb) APPLICATIONS 2

Pb contamination APPLICATIONS 2 seawater average [Pb] : 0.047 ppb contamination level : 1.040 ppb (5 ppb) APPLICATIONS 2 x20 x15

Mussel caging APPLICATIONS 3

Mussel caging APPLICATIONS 3

Applications www.ifremer.fr APPLICATIONS

Mussel caging Calvi sewer / Punta Bianca = 1.28 APPLICATIONS 3

Mussel caging APPLICATIONS 3 Calvi sewer / Punta Bianca : mussels = 1.28 water ~ 10 APPLICATIONS 3

Mussel caging APPLICATIONS 3 Calvi sewer / Punta Bianca : mussels = 1.28 water ~ 10 APPLICATIONS 3

DGTs vs bioindicators CONCLUSIONS

DGTs vs bioindicators Different and complementary informations; Organisms ecology in their chemical environment; Average TE concentrations over deployment time; Schedule monitoring campaigns. CONCLUSIONS

DGTs vs bioindicators Different and complementary informations; Organisms ecology in their chemical environment; Average TE concentrations over deployment time; Schedule monitoring campaigns. CONCLUSIONS Combined use in ecological, ecotoxicological and ecosystemic approaches of marine coastal environment functioning.

Thank you for your attention QUEST IONS

Introduction trace elements I N T R O D U C fluxes, balances; spatial distribution; speciation, … Geophysicochemistry I N T R O D U C trace elements Ecology ecosystems; organisms. Ecotoxicology adverse effects; pollution, …