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Brazilian Archives of Biology and Technology

Print version ISSN 1516-8913

Braz. arch. biol. technol. vol.54 no.3 Curitiba May/June 2011

https://doi.org/10.1590/S1516-89132011000300023 

ENVIRONMENTAL SCIENCES

 

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

 

 

Juliano José CorbiI,II,*; Felipe André dos SantosII; Ricardo ZerlinII; Ademir dos SantosIII; Claudio Gilberto FroehlichI; Susana Trivinho-StrixinoIV

IDepartamento de Biologia; Faculdade de Filosofia Ciências e Letras; Universidade de São Paulo; Ribeirão Preto - SP - Brasil
IIDepartamento de Ciências Biológicas e da Saúde; Centro Universitário de Araraquara; 14801-340; Araraquara - SP - Brasil
IIIDepartamento de Química Analítica; Instituto de Química de Araraquara; Universidade Estadual Paulista; 14800-970; C.P.: 355; Araraquara - SP - Brasil
IVDepartamento de Hidrobiologia; Universidade Federal de São Carlos; 13560-970; C.P.: 676; São Carlos - SP - Brasil

 

 


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.

Key words: stream macroinvertebrates; contamination; chromium


 

 

INTRODUCTION

Among the aquatic pollutants, heavy metals are the most appropriate indicator of pollution, because of their stability in sediments and scarcity in natural environments (Saiki et al., 2001). Potentially toxic metals introduced into aquatic environments by industrial, domestic and other human activities are absorbed and concentrated in the sediments (Du et al., 2007; Corbi et al., 2006) and in food chains (Notten et al., 2005; Schroder, 2005) causing mortality of the aquatic biota (Saiki et al., 2001). Metal accumulation in the sediments results in serious environmental problems to the surrounding areas, affecting the water quality and bioassimilation and bioaccumulation of metals by the aquatic organisms. As a consequence, potential long-term implications on human health and on the ecosystems are expected (Mertz, 1986; Ip et al., 2007; Corbi et al., 2008).

In the aquatic environment, sediments are the most significant physical pool of metals and may contribute significantly to its concentrations in stream macroinvertebrates, either by absorption/adsorption from terrestrial water or by direct ingestion (Clements, 1991; Pourang, 1996). Metal contamination of sediments resulting from urban runoff exerts a deleterious impact on freshwater macroinvertebrates, particularly the loss of metal sensitive orders such as Ephemeroptera (mayflies), Plecoptera (stoneflies) and Trichoptera (caddisflies) (Karouna-Renier and Sparling, 2001; Corbi and Trivinho-Strixino, 2008). 

Chromium is rarely found in natural waters (Mertz, 1986), but it can occur as a contaminant of waters from the leather industry activities. It is also used as a micronutrient in the fertilizers for sugar cane cultivation (Angelotti-Neto et al., 2004; Alcântara and Camargo, 2001; Batalha and Parlatore, 1993; Canto, 1997). In atmospheric air, the concentrations of chromium are about 0.1mg/m3; in non-impacted rivers the concentrations are about 1.0 mg.kg-1 and in marine waters, the concentrations are about 1.0 to 10mg.kg-1. In potable water, the permitted levels of chromium are 50mg.kg-1 (WHO, 1988). The vast majority of chromium in surface water may come from the particulate material in the sediments (ATSDR, 2000). In soils, the reference values are of 40 mg.kg-1 and the prevention values are 75 mg.kg-1. A study conducted by Leslie et al., (1999) demonstrated that extreme chromium contamination had an adverse effect on aquatic life in a lotic system, both at the community level (reducing diversity) and at the level of individuals (sublethal effects on surviving individuals).

In 2001, 150 tons of leather residues had been incorporated in the soil as a source of organic matter on the Monte Alegre Farm. These residues originating from the leather industry and  contained high concentrations of chromium, were irregularly used as soil fertilizer by the farmers  for mango, sugar-cane, coffee, orange, corn and lemons, contaminating the soils (Santos et al., 2009).

Monte Alegre stream, located near Monte Alegre farm, receives chromium from the runoff process. The aim of this work was to study the possible contamination of the sediments and of Odonata larvae by chromium in the Monte Alegre stream.  We also analyzed the possible impact caused by the contamination on the stream macroinvertebrates community structure.

 

MATERIAL AND METHODS

Study site

Monte Alegre Farm is located in Bueno de Andrade municipality in the State of São Paulo, Brazil (Fig. 1). The low order Monte Alegre stream is located near Monte Alegre Farm in a preserved area between the coordinates 21º34` (S) 48º11´ (W) and 21º34´(S) 48º 12´ (W) in the Mogi-Guaçu River basin (URGH9). The stream has low water velocity (<2m/s), low depth (<0.8m) and width (<1.5m) and is located at low altitude, (about 570m). The stream is within a Cerrado area and has predominantly sand substrates (fine and coarse, 70% of the total). The substrates are also composed of litter and wood debris. The dissolved oxygen varied from 8.1 to 9.4 mg/L, pH from 6.85 to 7.01, electric conductivity from 0.026 to 0.028 mS/cm and temperature from 22.3   to 23.6 °C. The wet season occurs between October and March, while the dry season occurs from April to September (Ometto et al., 2000). The stream is free from other anthropic impacts such as industrial, domestic or mining activities. Physical and chemical variables of water (pH, temperature, dissolved oxygen and electric conductivity) were measured in situ, by using a Yellow Springs multimeter, model 556.

 

 

Sampling and storage

Sediments and stream macroinvertebrates were collected in two points apart by 2.2 km distance; downstream (impacted area) between the coordinates 21º34´(S) 48º11´(W) and upstream (reference area) between the coordinates 21º34´(S) 48º 12´(W).

Sediments for chromium analysis were sampled in triplicate using a standard Ekman-Birge grab in a sampling area of 255cm2. Samples were taken twice at each site in June, 2006 and February, 2007. Sediments were stored at 4ºC until testing as proposed by Santos (1999). Larvae of Odonata were collected using a D-frame (Merrit and Cummins, 1996) aquatic net (mesh sieve 250 µm) and sampled exhaustively until there was enough biomass (at least 0.10 g dry weight) for laboratory analysis. Larvae retained in the net were transferred to acid-washed polypropylene bags and stored with ice during transportation to the laboratory, according to the methodology described by Pourang (1996).

Macroinvertebrates were surveyed in two periods: June, 2006 and February, 2007. The macroinvertebrates were collected using a D-frame (Merrit and Cummins, 1996) aquatic net (250 µm) including riffle and pool areas for five minutes as recommended by Fontoura (1985). Two collections were combined into a single sample at each point. Samples were transferred to the laboratory, washed in a 0.21mm mesh sieve, selected on an illuminated tray and fixed with 70% alcohol. Insects were dominant and for most of them taxonomic identification was made to family level, based on available keys (Brinkhurst and Marchese, 1991; Merritt and Cummins, 1996). Based on the study conducted by Corbi and Trivinho-Strixino (2006), family identification appeared to be good for monitoring the effects of land uses on stream macroinvertebrate communities in low order streams.

Three sediment sub-samples were collected from the streams for the organic matter determination.

Analytical procedures

Deionized double distilled water (DDDW) was used for the analysis. All acids were purchased from Merck® (analytical grade). The materials used during the experiments were previously washed with concentrated nitric acid as described before (Tschöpel et al., 1980).

Sediment samples for the metals determination were oven dried at 65 ºC on glass dishes, homogenized using a pestle and mortar and each of the weighed samples (about 2.0 g) was taken to a 100 mL be beaker to which 5.0 mL of HNO3 was added and digested near dryness at 90 ºC on a hot plate. The digested samples were cooled at room temperature, filtered by using filter papers and collected in 100mL beaker. The filter papers were washed with ca. 20 mL of water and the contents of the beaker were transferred to 100 mL volumetric flasks. The solutions were analyzed for metals in a Pye Unicam flame atomic absorption spectrophotometer. Analyses and digestions were undertaken in triplicate (De Paula and Mozeto, 2001).

Frozen Odonata larvae were thawed at room temperature. Larvae were pooled to obtain at least 0.10 g of dry weight. Digestion was performed in a similar way used for the sediment analyses. The cooled digested samples were transferred to 5.0 mL volumetric flasks (Pourang, 1996). Pooled samples were analyzed by graphite furnace AAS (model SHIMADZU ASC-6100). Analyses and digestions were undertaken in triplicate.

Organic matter content was determined by mass loss after ignition (550 ºC, 4 hours) in dry fractions of the sediments (dried in a stove at 60 ºC for 12 h) as described by Maitland (1979). Granulometric analyses of the sediments were made using the Biota-FAPESP protocol (São Paulo State Research Foundation, Brazil), (Process number 2003/10517-9).

Data analysis

Sediments and Odonata larvae

Differences for each chromium data set (chromium concentration in the larvae of Odonata and in the sediments of the stream) were tested using the Mann-Whitney test. The differences were considered significant if p< 0.05. The Mann-Whitney analysis was performed using GraphPad InStat version 3.00, GraphPad Software.

Stream macroinvertebrates community

The stream macroinvertebrates were analyzed by the participation of each taxonomic group and by the total organisms collected. Stream macroinvertebrates were analyzed considering the relative participation in three macroinvertebrates classes, according to Corbi and Trivinho-Strixino (2002). In order to evaluate the integrity of each stream, the community characteristics were determined by the following metrics: richness index (Margalef), diversity index (Shannon), dominance (Pielou), BMWP (with regional adaptations) and Belgian Biotic Index, EPT percentage (Ephemeroptera, Plecoptera and Trichoptera), ratio (%) of the number of EPT families by the total number of macroinvertebrate families (EPT/total of families X 100), ratio between the number of EPT (sensitive) and Chironomidae (tolerant) (EPT/Chironomidae X 100) and ratio between the Chironomidae number and the total of individuals collected (Chironomidae/total X 100). The PAST Program (Version 1.68) was used to calculate the richness index (Margalef), dominance and the diversity index (Shannon) (Hammer, 2001).

 

RESULTS

Sediments and Odonata larvae

The results showed high concentrations of chromium in the sediments of the Monte Alegre stream which suggested that chromium contaminated the aquatic sediments. In the downstream area (impacted area), chromium concentrations were three times higher than those found in the upstream area (reference area). In the downstream area, the concentrations varied from 30.1 to 32.4 mg.kg-1 and in the upstream area, the concentrations varied from 8.02 to 10.93 mg.kg-1.  The larvae of Odonata were also affected by the sediment contamination. In the downstream area, the concentrations varied from 0.64 to 0.72 mg.kg-1 and in the upstream area the concentrations varied from 0.42 to 0.46 mg.kg-1 (Table 1). The Mann-Whitney test, applied for metal concentrations in the sediments, showed significant differences in the concentrations of chromium between the upstream and downstream areas.

 

 

Stream macroinvertebrates community

In this study, 21 families of stream macroinvertebrates were identified (Table 2). The results showed high richness of aquatic macroinvertebrates in Monte Alegre stream (in both the areas), when compared to impacted streams in the state of São Paulo.

 

 

In the downstream area (impacted area), the Chironomidae family dominated the stream macroinvertebrates community, with 40% of the total organisms. In the upstream area (reference area), the Chironomidae contributed with 25% of the fauna. In the downstream area, other taxonomic groups such as Simuliidae and Elmidae were also observed, with 14 and 11%, respectively of the total fauna while in the upstream area, Elmidae with 25%, Perlidae with 10% and Corydalidae with 8% were the other dominant groups. The upstream and downstream areas showed a variety of groups of insects such as Ephemeroptera, Plecoptera and Trichoptera. Some families of EPT such as Perlidae, Polymitarcyidae and Polycentropodidae were observed in the two areas. Odontoceridae and Hydropsychidae (Trichoptera) were observed only in the downstream area (Table 2).

The values of the community index (richness index Margalef - IMg, diversity index Shannon - H’ and families richness – F) could be considered high in both the areas. In the upstream area, the values of these indexes were slightly higher than those found downstream. The dominance index was smaller in the upstream area when compared to the downstream area. The biotic indexes (BMWP and IBB) applied to the macroinvertebrates taxa of the two areas demonstrated excellent water quality in the upstream area and good water quality in the downstream area (Table 3).

 

 

Organic matter contents

The organic matter contents were relatively low for the two areas of the stream. Values varied from 5 to 20 %. The highest value was detected for the downstream area with 20% of organic matter content (Esteves, 1988).

 

DISCUSSION

According to the results obtained by Santos et al. (2009), the soils were contaminated with different concentrations of chromium depending on the agricultural activity of the farmers. In general, the concentrations varied from 35 to 50 mg.kg-1.

As has been described by Mozeto et al. (2006), there are reference values for the evaluation of the quality of sediments. For chromium, the threshold effect levels (TEL) and probable effect level (PEL) are 37.3 and 90.0 mg.kg-1, respectively. Toxicity rarely occurs below the TEL level but it occurs frequently above the PEL, and if it is between the two levels, toxicity may occur (Muniz et al., 2004). Thus, although the concentrations of chromium downstream were significantly higher than upstream, both the areas were below the threshold effect level. These values, lower than the TEL and the PEL levels, were probably related to the capacity of the organic substance and mineral fraction in holding back metals. The low values of organic matter detected in the sediments and the homogeneous substrate (sand substrates) observed in the stream suggested that these variables influenced at the low concentrations of metals (TEL and PEL values) in the sediment and in aquatic insects. As pointed out by Santos et al. (2009), the organic matter content exerted important functions in the linking of Cr in the soils.

With these results, it could be infered that the mobility of chromium from the soils to the waters and sediment of Monte Alegre stream was low. This fact probably contributed to the reduction of the contamination of Odonata larvae. Although with low concentrations, the major concentration of chromium observed for the larvae downstream could represent an important link in the transference of the metals to the upper trophic levels, such as birds, mammals and other organisms.

The inputs from the riparian sources, in the form of dissolved organic matter, leaf litter, fruits, woody debris and invertebrates, are recognized as important food resources for aquatic food webs in many systems (Lynch et al., 2002). Several studies have shown the importance of the riparian canopy for the stream macroinvertebrate community’s distribution (Ferreira-Peruquetti and Fonseca-Gessner, 2003; Benstead and Pringle, 2004; Goulart and Callisto, 2005). Bojsen and Jacobsen (2003) and Kay et al. (2001) showed that the reduction of the riparian canopy caused a decrease in litter detritus on the streambed and an increase in periphyton biomass, because of the light-related factors. In these streams, the macroinvertebrate communities were homogeneous and depauperate, in contrast to those found in the forested areas. The present results clearly showed the importance of the riparian vegetation, which permitted, in the two stations (upstream and downstream), a great taxa richness when compared to impacted streams in the state of São Paulo (Corbi and Trivinho-Strixino, 2008). The results confirmed that the contamination of the sediments was higher downstream when compared to the upstream area, but the stream macroinvertebrates were very similar at the two stations. Although similar, the upstream area presented some sensitive taxa such as Plecoptera, which were not present in the downstream area.

Many streams in São Paulo are located in a Cerrado vegetation area at low altitudes and with sand substrates. As a result, the dominance of Chironomidae is observed (Roque and Trivinho-Strixino, 2001; Freire and Gessner, 2002). This was also observed in the present study, where the Chironomidae dominated in the two studied areas. At the same time, the community index gave consistent information about the faunistic characteristics and integrity of the two areas of the Monte Alegre stream. Great taxa richness, added to the similar number of families collected and percentage of EPT groups, in addition to a high ratio between the sensitive and tolerant taxa (EPT/Chironomidae) found in the two stations, showed the importance of riparian vegetation for macroinvertebrates composition in the two areas.

Thus, further studies would be needed for detecting the efficiency of different insect groups to tolerate different metals in aquatic environments, as suggested by Nummelin et al. (2007) and Corbi et al. (2010) when studying different species of aquatic insects in impacted streams. The results also demonstrated the importance of the preservation of riparian vegetation for the stream macroinvertebrate community’s distribution, which appeared to be the most important factor influencing the composition of these aquatic fauna and were responsible for absorption of toxic products which came from the neighboring cultivated areas (Corbi, et al., 2010).

 

ACKNOWLEDGEMENTS

We would like to thank Professor Pedro P. Corbi and Dra. Vanessa Colombo-Corbi for valuable suggestions made during the research. Financial support was granted by FAPESP (São Paulo State Research Foundation, Brazil), (Process numbers 2006/61400-2 and 2003/10517-9).

 

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Received: July 20, 2009; Revised: February 02, 2010; Accepted: March 22, 2011

 

 

* Author for correspondence: julianocorbi@yahoo.com.br

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