Bed and suspended sediment-associated rare earth element concentrations and fluxes in a polluted Brazilian river system

A - Papers appearing in refereed journals

da Silva, Y., Nascimento, C., da Silva, Y., Amorim, F., Singh, V. and Collins, A. L. 2018. Bed and suspended sediment-associated rare earth element concentrations and fluxes in a polluted Brazilian river system . Environmental Science and Pollution Research. 25 (34), pp. 34426-34437.

Authorsda Silva, Y., Nascimento, C., da Silva, Y., Amorim, F., Singh, V. and Collins, A. L.
Abstract

Rare earth elements (REEs) have been recently recognized as emergent pollutants in rivers. However, data regarding REE fluxes in association with either bed or suspended are scarce. To address this knowledge gap, we determined the concentrations and fluxes of La, Ce, Pr, Nd, Sm, Eu, Gd, Yb, Lu, Dy, Er, Ho, Tb, and Tm in bed and suspended sediment samples of a representative polluted Brazilian River. Sediment-associated data on REEs were placed in the context of corresponding background concentrations in soils under natural conditions along the Ipojuca watershed. Light rare earth elements (LREEs) comprised more than 94% of the total REEs associated with bed and suspended sediments. Suspended sediments accounted for more than 95% of the total REE flux. The Ce and Nd fluxes of about 7 t year−1 underscore the importance of including REEs in future estimations of
global suspended sediment-associated element fluxes. In contrast, bedload often transported less than 0.0007 t year−1 of each REE. The main sources of pollution in the Ipojuca River are anthropogenic, likely due to domestic effluent and waste water from industrial and agricultural operations—major causes of sediment-associated Gd transport in polluted streams.

KeywordsLanthanides; Environmental quality; Sediment-associated transport; Watershed management; Water quality
Year of Publication2018
JournalEnvironmental Science and Pollution Research
Journal citation25 (34), pp. 34426-34437
Digital Object Identifier (DOI)doi:10.1007/s11356-018-3357-4
Open accessPublished as green open access
Funder project or codeS2N - Soil to Nutrition - Work package 3 (WP3) - Sustainable intensification - optimisation at multiple scales
FunderBiotechnology and Biological Sciences Research Council
Output statusPublished
Publication dates
Online10 Dec 2018
Publication process dates
Accepted26 Sep 2018
PublisherSpringer Heidelberg
Copyright licensePublisher copyright
ISSN0944-1344

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