Revista Ambiente & Água (Aug 2021)

Sorption studies of Cd and Cu on Brazilian alluvial soils

  • Vitor Hugo de Oliveira Barros,
  • Artur Paiva Coutinho,
  • Adriana Thays Araújo Alves,
  • Severino Martins dos Santos Neto,
  • Fernando Xavier de Assis,
  • Valmir Félix de Lima,
  • José Romualdo de Sousa Lima,
  • Antonio Celso Dantas Antonino

DOI
https://doi.org/10.4136/ambi-agua.2717
Journal volume & issue
Vol. 16, no. 4
pp. 1 – 16

Abstract

Read online

The Local Production Arrangement, located in the Pernambuco’s Agreste state, has been significantly developing the region's economy. Despite its importance, industrial activity has caused relevant environmental concerns regarding the disposal of textile effluents, especially from industrial laundries. This waste is made up of many chemicals, and among them are various types of heavy metals. The evaluation of the sorption behavior of contaminant transport mechanisms such as heavy metals is essential to assess the risk of contamination of alluvial aquifers. This study evaluated the sorption of heavy metals (Cu and Cd) in an alluvial sediment deposit in the Capibaribe River. Kinetics and isotherm experiments allowed the analyses of Cu and Cd sorption. Kinetics sorption showed an equilibrium tendency after 16 h for Cu and 18 h for Cd and was better described by a pseudo-second order model. The isotherm data were adjusted to the Linear, Freundlich and Langmuir models. Both linear and Freundlich models satisfactorily described sorption isotherms for the two pollutants. The metals in the study represent a risk of contamination of the groundwater of alluvial aquifers, mainly due to physicochemical attributes of the soil, such as high sand content (85%), low MO (2.1 g kg-1) and alkaline pH (8.2). The environmental conditions decrease absorption and facilitate metal mobility, greatly increasing the environmental risks inherent in pollutant leaching. Cu showed a higher affinity with the soil studied in all assays performed compared with the results of the tests for Cd.

Keywords