Anthropogenic gadolinium anomalies and rare earth elements in the water of Atibaia River and Anhumas Creek, Southeast Brazil

Autor(es)

de Campos, Francisco Ferreira ^{[1, 2]} ; Enzweiler, Jacinta ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Inst Geosci, CP 6152, BR-13083970 Campinas, SP - Brazil

^[2] Geol Survey Brazil, Rua Costa 55, BR-01304010 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ENVIRONMENTAL MONITORING AND ASSESSMENT; v. 188, n. 5 MAY 2016.
• Citações Web of Science: 9

Resumo

The concentrations of rare earth elements (REE), measured in water samples from Atibaia River and its tributary Anhumas Creek, Brazil, present excess of dissolved gadolinium. Such anthropogenic anomalies of Gd in water, already described in other parts of the world, result from the use of stable and soluble Gd chelates as contrast agents in magnetic resonance imaging. Atibaia River constitutes the main water supply of Campinas Metropolitan area, and its basin receives wastewater effluents. The REE concentrations in water samples were determined in 0.22-mu m pore size filtered samples, without and after preconcentration by solid-phase extraction with bis-(2-ethyl-hexyl)-phosphate. This preconcentration method was unable to retain the anthropogenic Gd quantitatively. The probable reason is that the Gd chelates dissociate slowly in acidic media to produce the free ion that is retained by the phosphate ester. Strong correlations between Gd and constituents or parameters associated with effluents confirmed the source of most Gd in water samples as anthropogenic. The shale-normalized REE patterns of Atibaia River and Anhumas Creek water samples showed light and heavy REE enrichment trends, respectively. Also, positive Ce anomalies in many Atibaia River samples, as well as the strong correlations of the REE (except Gd) with terrigenous elements, imply that inorganic colloidal particles contributed to the REE measured values. (AU)

• Processo FAPESP: 12/02486-5 - Anomalias antrópicas de elementos terras raras (ETR) no Rio Atibaia e tributários na região de Paulínia (SP)
• Beneficiário: Francisco Ferreira de Campos
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 12/05024-2 - Hidrogeoquímica de lantanídeos em águas fluviais e subterrâneas: estudos de caso na região de Campinas, SP
• Beneficiário: Jacinta Enzweiler
• Modalidade de apoio: Auxílio à Pesquisa - Regular