Ecotoxicological evaluation of sediments applied to environmental forensic investigation

Alves, Rodrigo Henrique; Rietzler, Arnola C.

doi:10.1590/1519-6984.02214

Cited by 4 publications

(1 citation statement)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Leather tanning uses large quantities of Cr(III), generally as the basic chromium sulphate Cr 2 (OH) 2 (SO 4 ) 2 . Chromium inputs from tanneries can markedly affect Cr concentrations and fluxes in aquatic environments at local scales (Alves and Rietzler, 2015;Dominik et al, 2007;Hayzoun et al, 2015;Sanyal et al, 2015) and the toxicological impact of tannery wastewaters containing numerous potentially harmful compounds was recently reviewed by Saxena et al (2017). However, understanding the contribution of Cr(III) to the overall biological response is far from straightforward because tannery effluents contain several toxicologically active substances.…”

Section: Introductionmentioning

confidence: 99%

Chromium bioavailability in aquatic systems impacted by tannery wastewaters. Part 1: Understanding chromium accumulation by indigenous chironomids

Vignati

Ferrari

Roulier

et al. 2019

Science of The Total Environment

View full text Add to dashboard Cite

The tanning industry uses large quantities of Cr whose contribution to the contaminant burden of aquatic organisms is not yet fully understood. The present study investigated Cr bioaccumulation by indigenous chironomids in a freshwater ecosystem impacted by tannery effluents. Total Cr content in sediments and in chironomids was determined on several occasions. Chromium distribution among sediments and pore waters, and Cr speciation in overlying and pore waters were studied in detail to understand possible factors controlling Cr bioavailability to chironomids. Total chromium concentration ranged from 69 to over 3000 µg g-1 dry weight in sediments and from negligible to over 300 µg-1 dry weight in chironomids (values corrected for sediment gut content). Filterable (<0.45 µm) Cr concentration in overlying waters and pore waters from the surface sediment layers (upper 2 cm) ranged from 3 to 120 µg L-1 , with Cr(VI) representing 0.5-28% of the total filterable Cr. Chromium profiles in pore waters as determined by diffusive equilibration in thin films (DET) and diffusive gradient in thin films (DGT) were comparable. DGT-labile Cr accounted for less than 2% of the total Cr measured by DET. Although Cr concentrations in sedimentary and aqueous matrices were not directly proportional to Cr levels measured in chironomids, the available findings suggested that Cr inputs from tanneries were bioavailable to resident chironomids. These observations are of particular importance considering that Cr(III), putatively of limited bioavailability and ecotoxicological concern, is the predominant redox form of Cr in bed sediments impacted by tannery discharges. The companion paper provides further insight into Cr bioavailability and effects in tannery impacted ecosystems using a combination of in situ and laboratory approaches.

show abstract