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Baseline metal concentrations in coastal Labrador sediments
G Veinott1, S Perron-Cashman, M R Anderson
1Department of Fisheries and Oceans, Northwest Atlantic Fisheries Centre, P.O. Box 5667, St John's, NF, Canada A1C 5X1.
Marine Pollution Bulletin
|May 31, 2001
Summary
Voisey's Bay sediments show no signs of recent metal pollution. Lithium-normalized metal levels are within natural background ranges, establishing a baseline for future environmental monitoring.
Area of Science:
- Environmental Science
- Geochemistry
- Marine Geology
Background:
- Coastal Labrador's Voisey's Bay sediments were analyzed for metal content.
- Assessing anthropogenic impact on marine environments is crucial for conservation.
- Establishing baseline metal concentrations is key to detecting pollution.
Purpose of the Study:
- To determine if recent human activities have introduced excess metals into Voisey's Bay surface sediments.
- To establish a baseline for natural metal variability in the region.
- To evaluate the utility of lithium-metal regressions for environmental assessment.
Main Methods:
- Analysis of surface sediment samples from Voisey's Bay.
- Measurement of chromium (Cr), copper (Cu), iron (Fe), lead (Pb), nickel (Ni), and zinc (Zn) concentrations.
- Normalization of metal concentrations to lithium (Li) and regression analysis.
Main Results:
- Metal concentrations in surface sediments, normalized to Li, were within the 95% confidence limits of background levels.
- No evidence of recent anthropogenic metal input was found.
- Li-metal regression lines for surface and 30-cm depth sediments showed no significant difference in slope or intercept.
Conclusions:
- Current metal levels in Voisey's Bay sediments do not indicate recent pollution.
- Lithium-metal relationships effectively represent natural metal variability and serve as a reliable baseline.
- This baseline is essential for assessing future anthropogenic impacts in the region.