AVALIAÇÃO FITOTOXICOLÓGICA DOS SEDIMENTOS DO RESERVATÓRIO RIO GRANDE PERTENCENTE AO COMPLEXO BILLINGS, SÃO PAULO, SP

Código

ENES20200073

Autores

Thais de Araujo Goya Peduto, Letícia Ribeiro Bernardes Casado, Tatiane Araujo de Jesus, ROSELI FREDERIGI BENASSI

Tema

07 - QUALIDADE DA ÁGUA E GEOQUÍMICA DE SEDIMENTOS

Resumo

It is known that water is a fundamental resource for all living beings to survive. However, the inappropriate discharge of untreated and/ or inefficiently treated sewage, toxic substances and microorganisms degrades the water quality. In this scenario, several Brazilian water bodies are polluted nowadays. The compartment sediment is considered the memory of the aquatic environment and concentrate the pollutants, which can be released again for the water column. In addition, it is a living compartment, where benthic organisms live. Thus, assessing the quality of sediments is of great importance in the conservation of biodiversity and sanitation. The bioassays aim to determine if there are substances that can inhibit the germination of seeds, besides having the advantages of low cost, simplicity in the test, low maintenance and easy acquisition. Therefore, present study aimed to evaluate the phytotoxicity of sediments collected in three sampling stations of the Rio Grande reservoir, using three plant indicators: cucumber seeds (Cucumis sativus), garden watercress (Lepidium sativum) and mustard (Sinapis alba). Results showed toxicity in some samples, highlighting station 2 (Central body) with more toxic results. Station 3 (Ribeirão Pires) in all analyses performed resulted in Germination Index (GI) above 100, possibly due to the availability of nutrients in excess deposited in its bed, since this station is close to a sewage disposal. The species of watercress in the garden presented greater sensitivity to GI. The results contribute to advances in a possible future inclusion of bioassays with seeds in the monitoring of water and sediment quality.