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<p>Rainfall aggravates the problem of water quality by increasing surface runoff and river flow, allowing contaminants to become more bioavailable. The objective of the study was to evaluate the water quality of the Marrecas River, Paraná, Brasil and others tributaries, after a rainy event. For this, physicochemical analyses and ecotoxicological tests were performed out on the water collected of the Marrecas River (Points 1, 2, 3, 6 and 7) and at the mouth of the Lonqueador, Paraná, Brasil and Urutago, Paraná, Brasil Rivers (Points 4 and 5). The physicochemical analyses showed high values for turbidity (P1, P2, P3, P6 and P7), total dissolved solids (at all points evaluated), agrochemical 2,4D (P3, P4, P5, P6 and P7), with values above that allowed by the Brazilian legislation and elevated values for estrogen hormones estrone (P5), 17β-estradiol (P1, P2, P3, P4 and P5), 17α-ethinylestradiol (at all points evaluated) and estriol (P3, P5 and P7). The samples did not affect the mobility/mortality to <i>Artemia salina</i> and neither showed cytotoxic or genotoxic effect for <i>Allium cepa</i>. However, for <i>Eisenia fetida</i> P4 showed toxic effect by the escape test, and for <i>Lithobates catesbeianus</i> showed cytotoxic (P1) and mutagenic effect (P5 and P6). For human liver cell culture (Huh7.5) points 3 and 5 altered the cell divisions by MTT test. The Principal Components Analysis indicated positive correlation between the ecotoxicity presented by the bioindicators and the physicochemical parameters of the samples evaluated. Thus, the data alert on the need for constant monitoring and protection measures of these waters, especially in rainy seasons. Thus, continuous monitoring, natural barriers, effluent treatment, environmental education, supervision and improvements in urban drainage are essential to protect water, especially during rainy periods.</p>

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Physicochemical and Ecotoxicological Changes of the Waters of the River Marrecas, Paraná, Brasil and others Tributaries in High-Flow

  • 期刊论文

  • 发表日期：

    2025年5月28日

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  • Patricia Aline Bressiani,
  • Anna Karolina Gomes de Oliveira,
  • Cassiano Aparecido de Souza,
  • Mariah Pereira Rosa da Silva,
  • Ana Carolina Pires Moreira,
  • Ana Paula de Oliveira Schmitz,
  • Juan Carlos Pokrywiecki,
  • Ticiane Sauer Pokrywiecki,
  • Fernando César Manosso,
  • Eduardo Michel Vieira Gomes,
  • Rodrigo Lingnau,
  • Gisele Arruda,
  • Franciele Aní Caovilla Follador,
  • Elisângela Düsman

摘要

Rainfall aggravates the problem of water quality by increasing surface runoff and river flow, allowing contaminants to become more bioavailable. The objective of the study was to evaluate the water quality of the Marrecas River, Paraná, Brasil and others tributaries, after a rainy event. For this, physicochemical analyses and ecotoxicological tests were performed out on the water collected of the Marrecas River (Points 1, 2, 3, 6 and 7) and at the mouth of the Lonqueador, Paraná, Brasil and Urutago, Paraná, Brasil Rivers (Points 4 and 5). The physicochemical analyses showed high values for turbidity (P1, P2, P3, P6 and P7), total dissolved solids (at all points evaluated), agrochemical 2,4D (P3, P4, P5, P6 and P7), with values above that allowed by the Brazilian legislation and elevated values for estrogen hormones estrone (P5), 17β-estradiol (P1, P2, P3, P4 and P5), 17α-ethinylestradiol (at all points evaluated) and estriol (P3, P5 and P7). The samples did not affect the mobility/mortality to Artemia salina and neither showed cytotoxic or genotoxic effect for Allium cepa. However, for Eisenia fetida P4 showed toxic effect by the escape test, and for Lithobates catesbeianus showed cytotoxic (P1) and mutagenic effect (P5 and P6). For human liver cell culture (Huh7.5) points 3 and 5 altered the cell divisions by MTT test. The Principal Components Analysis indicated positive correlation between the ecotoxicity presented by the bioindicators and the physicochemical parameters of the samples evaluated. Thus, the data alert on the need for constant monitoring and protection measures of these waters, especially in rainy seasons. Thus, continuous monitoring, natural barriers, effluent treatment, environmental education, supervision and improvements in urban drainage are essential to protect water, especially during rainy periods.