Details

Autor(en) / Beteiligte

• da Silva, Fábio Ferreira
• Quináglia, Gilson Alves
• Oliveira, Pedro Vitoriano

Titel

Assessment of arsenic and lead mobility in the Ribeira do Iguape Valley, Southeastern Brazil

Ist Teil von

• Environmental earth sciences, 2021-11, Vol.80 (22), Article 751

Ort / Verlag

Berlin/Heidelberg: Springer Berlin Heidelberg

Erscheinungsjahr

2021

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The determination of As and Pb was performed in surface water, pore water, and sediment from eight samples along the Ribeira do Iguape Valley watershed, Brazil, an old mining region, to assess the mobility and improve understanding of the environmental risk that these elements currently cause. Methods using ICP-MS were applied for the determination of these elements in all samples. The concentration ranges for As (0.11 ± 0.02 µg L −1 to 0.44 ± 0.02 µg L −1 ) and Pb (0.31 ± 0.01 µg L −1 to 2.02 ± 0.01 µg L −1 ) in water were very low, being possible fit them into highest natural water quality, according to the Brazilian regulation. Sediment samples collected at point P5 (Betari River) revealed As (113 ± 1 mg kg −1 ) and Pb (672 ± 9 mg kg −1 ) concentrations above the acceptable standards adopted by the local authorities. The application of sequential extraction procedures to this sample showed that more than 90% of Pb seem to be strongly bound to the sediment matrix, while arsenic showed higher mobility, between 60 and 90%, probably due to the action of acid agents. Arsenic speciation in pore water of this sample, using HPLC–ICP-MS, revealed the presence of As (III) as prevalent specie. At the point P5, near to the oldest mine (Furnas Mine), Pb is strongly associated with the sediment matrix, while As has a potential for migration in low pH conditions; in other collection points, the concentrations of these elements are below to the values recommended by regulation.