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Variations in the V and Ni content in mussels after the Prestige spill VERTIMAR-2005 SYMPOSIUM ON...
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Variations in the V and Ni content in mussels after the Prestige spill
VERTIMAR-2005VERTIMAR-2005SYMPOSIUM ON MARINE ACCIDENTAL OIL SPILLSSYMPOSIUM ON MARINE ACCIDENTAL OIL SPILLS
Vigo, Spain, 13-16 July 2005Vigo, Spain, 13-16 July 2005
VERTIMAR-2005VERTIMAR-2005SYMPOSIUM ON MARINE ACCIDENTAL OIL SPILLSSYMPOSIUM ON MARINE ACCIDENTAL OIL SPILLS
Vigo, Spain, 13-16 July 2005Vigo, Spain, 13-16 July 2005
V. Besada, F. Schultze, J.A. Soriano, L. Viñas, A. Franco,
B. Cambeiro, J.J. González
Instituto Español de Oceanografía, Centro Oceanográfico de Vigo, 36280 Vigo, Spain
Introduction
The 13th of November 2002 and during the following months, the tanker Prestige released part of the 77.000 t of fuel
The Galician and Cantabrian Spanish coast were more of less impacted by the fuel spill
The concentrations of V and Ni in the Prestige fuel were 170 ± 5 mg/kg and 55 ± 1 mg/kg for V and Ni respectively
Objectives of the study
Estimate in Corrubedo and Punta Insua, two of the most affected areas by the fuel spill, the temporal evolution of the concentrations of vanadium and nickel in wild mussels (Mytilus galloprovincialis) during two years after Prestige accident
Observe the relation of V and Ni with the Polycyclic Aromatic Hydrocarbons (PAHs) concentrations
Sampling
4000 m
13° 12° 11° 10° 9°
43°
42°
PUNTA INSUA
CORRUBEDO
vessel broke in two
Drifting vessel
13/11/02
Sampling
The wild mussel was chosen as a pollution indicator, as this is a sedentary species, has a wide geographic distribution, has enough size, is easy to sample and easily accumulates pollutants, reflecting the environmental conditions of the area in which it lives
Analyses were made in pools of mussel soft tissue containing 50 individuals minimum, representing all sizes present in the sampling point. The homogenates were triturated with Ultraturrax and freeze-dried. The samples were homogenized again and stored until their analysis.
Chemical Analysis and Quality Control
The analysis of trace metals includes a nitric acid digestion in a microwave and V and Ni were analyzed by ETAAS with Zeeman background correction.
After Soxhlet extraction followed by extract cleaning using column chromatography with desactivated alumina, 13 PAHs have been determined using high performance liquid chromatography, with wavelength-programmable fluorescence detector.
The laboratory internal QC includes duplicate samples ,the use of certified reference materials as well as participation in international intercomparison exercises, such as QUASIMEME, on a regular basis.
Comparison of V and Ni with other elements
Corrubedo
0.00
1.00
2.00
3.00
4.00
5.00
6.00
7.00
8.00
October 2000 February 2003 June 2003 November 2003 April 2004 July 2004
mg
/kg
dry
we
igh
t
Cadmium Lead Mercury Nickel Vanadium
Punta Insua
0.00
1.00
2.00
3.00
4.00
5.00
6.00
7.00
8.00
October 2000 February 2003 June 2003 November 2003 April 2004 July 2004
mg
/kg
dry
we
igh
t
Cadmium Lead Mercury Nickel Vanadium
Comparative evolution of V and PAHs
Comparative evolution of V and PAHs
0.00
1.00
2.00
3.00
4.00
5.00
6.00
7.00
8.00
9.00
October 2000 February 2003 June 2003 November 2003 April 2004 July 2004
V (
mg
/kg
dry
we
igh
t)
0
1000
2000
3000
4000
5000
6000
7000
8000
9000
Su
m 1
3 P
AH
s (
µg
/kg
dry
we
igh
t)Vanadium
Sum 13 PAHs
Corrubedo
Comparative evolution of V and PAHs
Comparative evolution of V and PAHs
Punta Insua
0.00
1.00
2.00
3.00
4.00
5.00
6.00
7.00
8.00
9.00
October 2000 February 2003 June 2003 November 2003 April 2004 July 2004
V (
mg
/kg
dry
we
igh
t)
0
500
1000
1500
2000
2500
3000
3500
4000
4500
Su
m 1
3 P
AH
s (
µg
/kg
dry
we
igh
t)
Vanadium
Sum 13 PAHs
Comparative evolution of Ni and PAHs
Comparative evolution of Ni and PAHs
Corrubedo
0.00
0.50
1.00
1.50
2.00
2.50
3.00
3.50
4.00
4.50
5.00
October 2000 February 2003 June 2003 November 2003 April 2004 July 2004
Ni (
mg
/kg
dry
we
igh
t)
0
1000
2000
3000
4000
5000
6000
7000
8000
9000
Su
m 1
3 P
AH
s (
µg
/kg
dry
we
igh
t)
Nickel
Sum 13 PAH
Comparative evolution of Ni and PAHs
Comparative evolution of Ni and PAHs
Punta Insua
0.00
1.00
2.00
3.00
4.00
5.00
October 2000 February 2003 June 2003 November 2003 April 2004 July 2004
Ni (
mg
/kg
dry
we
igh
t)
0
500
1000
1500
2000
2500
3000
3500
4000
4500
Su
m 1
3 P
AH
s (
µg
/kg
dry
we
igh
t)
Nickel
Sum 13 PAH
Summary No variations in the metals concentrations usually analysed in the National Monitoring were observed due to the Prestige
When comparing the evolution in the V and sum PAHs concentrations along the different sampling surveys, a temporal difference of 4-6 months between the occurrence of the maximum of sum PAHs levels and the maximum of V has been shown.
For V and Sum PAHs the concentrations in the mussels decrease quickly, getting to normal values in some months after the accident
Summary
The Prestige influence is not clearly
showed in the temporal evolution of the Ni concentrations.
A. Dufour has reported a similar evolution after the Erika spill
Acknowledgements
The authors would like to thank the Spanish Ministry of Science and Technology for the financial support (VEM2003-20068-C05-03).