Assessment of chromium contamination in the Monte Alegre stream: a case study

Abstract

The aim of this work was to study the contamination by chromium in the sediments of the Monte Alegre stream and in the larvae of Odonata and the possible impact caused by them on the stream macroinvertebrates community. It was found that chromium contaminated the sediments and the aquatic biota. Although, the stream macroinvertebrates community structure did not appear to be modified.

Trace element accumulation in lotic dragonfly nymphs: Genus matters

“…As has been shown for macroinvertebrates in general [ 1 , 2 , 3 , 4 ] and more specifically with dragonfly nymphs in other systems [ 35 , 33 ], genus and element specific patterns of accumulation were found among the 8 genera and 16 elements. No single genus consistently accumulated high or low concentrations of all elements, but as others have found [ 5 , 6 , 7 ], we were able to use multi-element trace element concentrations to distinguish patterns in accumulation among genera and sites.…”

“…However trace element accumulation in aquatic macroinvertebrates can exhibit both element and species specific patterns [ 1 , 2 , 3 , 4 ]. No single macroinvertebrate taxa will likely be consistently high or low in all essential or non-essential elements, but multi-element trace element concentrations can distinguish patterns in accumulation among taxa and sites [ 5 , 6 , 7 ]. Constituents of coal combustion wastes (CCW) exposes aquatic organisms to a such broad variety of potentially toxic metals and metalloids such as As, B, Cd, Cr, Cu, Hg, Ni, Pb, Sb, Se, Sr, V, and Zn [ 8 , 9 , 10 ].…”

“…Dragonflies are excellent models for diverse ecological, evolutionary, and behavioral studies [ 28 ]. The utility of dragonflies in assessments of bioavailable contaminants [ 6 , 29 , 30 , 31 , 32 , 33 ] and stream assessments [ 34 ] is becoming increasingly appreciated. Their predaceous behavior and relatively long nymph stage renders them potentially excellent integrators of biologically available contaminants across time.…”

“…Even specificity within these categories occurs with, for example, some burrowing species tending to inhabit specific grain-size sediments [ 37 , 39 ]. Such habitat specificity may restrict contaminant exposure vectors and influence trophic uptake as does the relatively small home ranges of nymphs [ 6 , 31 ].…”

Avaliação da remoção de cromo hexavalente a partir de adsorventes à base de quitosana e celulose bacteriana e os seus efeitos na biota aquática

“…(H2CrO4); e, no tratamento de madeiras utilizadas para estacas (Na2Cr2O7) na prevenção de danos causados por cupins. Consoante o caso de Bueno de Andrade-SP, descrito porCorbi et al (2011), em que o aporte de cromo no sedimento de coleções hídricas ocorre por meio de escoamento superficial de As características físicas e químicas dos ecossistemas -potencial redox, pH e temperatura -, assim como da presença de outras moléculas orgânicas e inorgânicas, determinam os estados de valência e a solubilidade relativa do cromo predominantes no meio (MARSH;MCINERNEY, 2001;MOORE;RAMAMOORTHY, 1984). Estas características determinam a biodisponibilidade dos íons metálicos, evidenciando a necessidade da determinação quantitativa e qualitativa dos metais no ambiente(KATZ, 1991).…”