Ecotoxicological Evaluation by means of bioassay with Daphnia Pulex in sediments of the Suches River, Cojata Peru-Bolivia Border, 2019

• Bethy Andy Mamani Villalba

  , Universidad Peruana Unión, Juliaca-Perú

  Author

  https://orcid.org/0000-0002-9992-5649 (unauthenticated)

• Ivan Edward Biamont Rojas

  , Universidade Estadual Paulista Júlio de Mesquita Filho, Sorocaba-Brasil

  Author

  https://orcid.org/0000-0002-6799-835X (unauthenticated)

• Brígida Calsin Quinto

  , Bahçeşehir Üniversitesi, Estambul-Turquía

  Author

  https://orcid.org/0000-0003-2217-5736 (unauthenticated)

Unregulated anthropogenic extractive activities discharge their wastes into water bodies without complying with minimum standards and these metallic compounds present a toxicological potential when they sediment. The objective was to evaluate the ecotoxicity of heavy metals in sediments of the Suches river by means of a bioassay with Daphnia pulex. This was developed in three phases: exploration of the study area, laboratory tests for heavy metals and toxicological bioassay with Daphnia pulex. for the extraction of the elutreate, the sediment toxicity test protocol was used (Garmendia, et.al., 2009) and for the bioassay with Daphnia
pulex, the methodology established in the Chilean Technical Standard (NCh2083.
Of1999) was applied. The concentration of heavy metals in sediments of the Suches river (4 sampling points) and the toxicity of heavy metals present in sediments on the species Daphnia pulex were evaluated. The concentration where there is no observed
effect (NOEC) for MuSe-1 is 21.2 % (53 g/L), MuSe-3 is 32.2 % (80.5 g/L), MuSe-4 is 44.4 % (111.0 g/L), MuSe-5 is 57.3% (143.3 g/L) and the lowest observed effect concentration (LOEC) for MuSe-1 is 30.4 % (76 g/L), MuSe-3 is 41. 0% (102.5), Muse-4 is 52.0 % (130.0 g/L), MuSe-5 is 67.6 % (169 g/L); the dose generating death at 50% of the exposed population (LC 50) for MuSe-1 is 37.5 % (93.6 g/L),
MuSe-3 is 45.9 % (114.8 g/L), Muse-4 is 55.9 % (139.9 g/L), MuSe-5 is 63.8 % (159.4 g/L). Therefore, it is concluded that the sediments of the Suches river basin present toxic levels.

1. Bethy Andy Mamani Villalba, , Universidad Peruana Unión, Juliaca-Perú

   Ingeniero Ambiental, ORCID 0000-0002-9992-5649

2. Ivan Edward Biamont Rojas, , Universidade Estadual Paulista Júlio de Mesquita Filho, Sorocaba-Brasil

   Magister Scientiae, ORCID 0000-0002-6799-835X

3. Brígida Calsin Quinto, , Bahçeşehir Üniversitesi, Estambul-Turquía

   Licenciado en Lingüística e Inglés, ORCID 0000-0003-2217-5736

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