Toxicidade e fitotoxicidade da água do rio Poti no perímetro urbano de Teresina - Piauí

Abstract

The article investigates the toxicity and phytotoxicity of water from the Poti River in the urban area of Teresina, na important tributary of the Parnaíba River, which suffers from the discharge of domestic and industrial effluents, resulting in significant degradation of its quality. The study aimed to analyze the effects of this pollution through ecotoxicological tests with Artemia salina and Allium cepa l., observing changes in aquatic organisms and plants. The methodology included the collection of samples from two distinct points: before and after the river crosses the urban area of Teresina. Acute toxicity tests on microcrustaceans and phytotoxicity analyses on Allium cepa were carried out, considering parameters such as root growth and lethality.The results from both tests revealed higher toxicity in the samples collected after the river passed through the urban area. In the Allium cepa test, the point before the city showed significantly better root development, while the second point inhibited root growth. In the tests with Artemia salina, the urban point was also more toxic than the point before the city, highlighting the negative influence of urbanization on the quality of the Poti River.