Heavy metals in recent sediments and bottom-fish under the influence of tanneries in South Brazil |
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| Authors: | Maria Lucia Kolowski Rodrigues Milton Luiz Laquintinie Formoso |
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| Institution: | 1. Funda??o Estadual de Prote??o Ambiental do Estado do Rio Grande do Sul, Rua Aurélio Porto 45, CEP 90620/090, Porto Alegre, RS, Brazil
2. Universidade Federal do Rio Grande do Sul, Programa de Pós-Gradua??o em Geociências, Porto Alegre, RS, Brazil
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| Abstract: | Selected metals were evaluated in surface sediments from Cadeia and Feitoria Rivers (Brazil), potentially affected by tanneries. Statistical factor analysis of sediment data allowed the identification of critical} metals and priority areas for biological monitoring, i.e., chromium and mercury at the lower course of Feitoria River. Non-piscivorous bottom-fish from the species Rineloricaria cadeae (violinha) were collected at reference and contaminated sites. Chromium was undetected} in fish tissues, and mercury accumulated in individuals living in contact with contaminated deposits. Mercury contents in fish were below World Health Organization quality standard for human consumption (0.5 μg/g). The ratio of total mercury content in fish (wet weight) to sediment (dry weight, <63 μm) was 0.5 and 0.7 at reference and contaminated sites, respectively. A risk assessment based on hazard index showed that maximum consumption of fish from contaminated site by human population should be 32 g/day, while at reference site the allowable amount could reach 140 g/day. |
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