Spatial distribution of gut juice extractable Cu,Pb and Zn in sediments from the Pearl River Estuary,Southern China |
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| Institution: | 1. Eawag: Swiss Federal Institute of Aquatic Science and Technology, Überlandstrasse 133, Dübendorf 8600, Switzerland;2. ORNL: Oak Ridge National Laboratory, Oak Ridge, TN, USA;3. ETHZ: Swiss Federal Institute of Technology, Stefano-Franscini-Platz 5, Zürich 8093, Switzerland;4. Department of Civil, Construction & Environmental Engineering, NC State University, Mann Hall 311, 2501 Stinson Drive, Raleigh, NC 27695, USA;5. Basque Centre for Climate Change (BC3), Scientific Campus of the University of the Basque Country, Sede Building 1, 1st floor, Leioa 48940, Spain;6. IKERBASQUE, Basque Foundation for Science, Maria Diaz de Haro 3, 6 solairua, Bilbao 48013, Spain;1. Université de Bordeaux, UMR CNRS 5805 EPOC, Bat 18, Allée Geoffroy Saint-Hilaire, 33615 Pessac, France;2. Laboratoire de Recherche sur les Transferts dans l''Environnement, Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PRP-ENV/SERIS/LRTE, Centre de Cadarache, bat 159, 13115 St Paul lez durance, France |
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| Abstract: | In this study, we compared the spatial distribution of total metals (Cu, Pb, and Zn) and bioaccessible metals, which were quantified by incubating sediments with the digestive fluid of sipunculans Sipunculus nudus, in natural sediments of the Pearl River Estuary (PRE). The spatial distribution of bioaccessible metal was not the same as that of total metals in PRE sediments, which were mainly controlled by fine-grained size, total organic carbon (TOC) and Fe. Geochemical factors were important in interpreting this different spatial variation. The similar spatial variations of bioaccessible Cu and total Cu were related to TOC in PRE sediments. Differently from the total Zn, a higher bioaccessible Zn was detected near the West Channel of PRE because of a lower TOC. However, the distribution of bioaccessible Pb was not significantly related to any sediment geochemistry. This study provides a more accurate view of metal pollution in the PRE natural sediments. |
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