1. Tilapia (Oreochromis niloticus) as a biondicator of copper and cadmium toxicity. A bioavailability approach
- Author
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Amanda L. Alcântara, Amauri Antonio Menegário, José Roberto Ferreira, Maria Teresa Araujo Silva, Diogo Barcot Tintor, Tatiana Cristina Senra Motta, Thiago de Araujo Dourado, Universidade de São Paulo (USP), Universidade Estadual Paulista (Unesp), and Agência Paulista de Tecnologia Do Agronegócio (APTA)
- Subjects
Metals acute toxicity ,Bioavailability ,Alkalinity ,chemistry.chemical_element ,010501 environmental sciences ,01 natural sciences ,Metal ,Dissolved organic carbon ,0105 earth and related environmental sciences ,Cadmium ,biology ,Chemistry ,Bioindicator ,0402 animal and dairy science ,Oreochromis niloticus ,04 agricultural and veterinary sciences ,General Chemistry ,biology.organism_classification ,040201 dairy & animal science ,Copper ,Acute toxicity ,Oreochromis ,visual_art ,Environmental chemistry ,visual_art.visual_art_medium ,Chemical speciation - Abstract
Made available in DSpace on 2018-12-11T17:08:16Z (GMT). No. of bitstreams: 0 Previous issue date: 2017-01-01. Added 1 bitstream(s) on 2019-10-09T18:30:41Z : No. of bitstreams: 1 S0103-50532017000100143.pdf: 524317 bytes, checksum: bab5cb235854176a4aee2e9850e5054c (MD5) The acute toxicity of copper and cadmium in Oreochromis niloticus was evaluated through a 96 h static assay. Precipitation of Cu and co-precipitation of Cd in the presence of Cu were noted, being indicative of differences in nominal and actual concentrations of metals. Under these conditions, LC50-96h was determined as 3.53 mg L-1 Cu, 20.1 mg L-1 Cd and 1.36 mg L-1 (Cu + Cd). Besides the quantitative determinations of total dissolved metals in water, considerations on Cd/Cu interactions in aquatic media were presented, allowing the assessment for metals speciation. Data revealed that alkalinity, hardness, dissolved organic carbon and formation of inorganic complexes reduce metal availabilities, mainly in relation to Cu. In spite of this, the LC50 for Cd was significantly reduced in the presence of Cu, matching environmental realistic values. Based on simulated fate of metals, hardness may impair a reduction of 18 and 2% in metal activities, respectively to Cu and Cd. Centro de Energia Nuclear Na Agricultura Universidade de São Paulo (USP), Av. Centenário, 303 Centro de Estudos Ambientais Universidade Estadual Paulista (UNESP), Av. 24A, 1515 Polo Regional Centro Sul Agência Paulista de Tecnologia Do Agronegócio (APTA), Rod. São Paulo 127, Km 30 Centro de Estudos Ambientais Universidade Estadual Paulista (UNESP), Av. 24A, 1515
- Published
- 2017