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Spatial distribution of trace elements in the surface sediments of a major European estuary (Loire estuary, France): source identification and evaluation of anthropogenic contribution

1. Introduction
2. Material and methods
2.1. Study area and sampling sites
2.2. Sampling strategy and analytical methods
3. Results
4. Discussion
4.1. Relationship between trace element concentrations, POC and grain size
4.2. Spatial distribution of enrichment factors (EF)
4.3. Origin of anoimalies: intra-estuarine vs watershed-derived
4.4. Identification of potential intra-estuarine sources
4.5. Role of estuarine processes vs sources in trace element spatial distribution (role of POC, normalisation grain-size and/or POC?)
4.6. Sediment quality assessment for trace elements in the Loire estuary
5. Conclusions and perspectives
Acknowledgments
References